Resonance is a phenomenon that occurs when the frequency of a vibration of an external force matches an object's natural frequency of vibration, resulting in a dramatic increase in amplitude.
When the frequency of the external force equals the natural frequency of the object, resonance is said to occur. This results in an enormous increase in the amplitude of the object's vibration.
In other words, resonance is the tendency of a system to oscillate at greater amplitude at certain frequencies than at others. Resonance occurs when the frequency of an external force coincides with one of the system's natural frequencies.
A standing wave is a type of wave that appears to be stationary in space. Standing waves are produced when two waves with the same amplitude and frequency travelling in opposite directions interfere with one another. As a result, the wave appears to be stationary. Standing waves are found in a variety of systems, including water waves, electromagnetic waves, and sound waves.
The Doppler effect is the apparent shift in frequency or wavelength of a wave that occurs when an observer or source of the wave is moving relative to the wave source. The Doppler effect is observed in a variety of wave types, including light, water, and sound waves.
Constructive interference occurs when two waves with the same frequency and amplitude meet and merge to create a wave of greater amplitude. When two waves combine constructively, the amplitude of the resultant wave is equal to the sum of the two individual waves. When the peaks of two waves meet, constructive interference occurs.
Destructive interference occurs when two waves with the same frequency and amplitude meet and merge to create a wave of lesser amplitude. When two waves combine destructively, the amplitude of the resultant wave is equal to the difference between the amplitudes of the two individual waves. When the peak of one wave coincides with the trough of another wave, destructive interference occurs.
The resonant frequency is the frequency at which a system oscillates with the greatest amplitude when stimulated by an external force with the same frequency as the system's natural frequency. The resonant frequency of a system is determined by its mass and stiffness properties, as well as its damping characteristics.
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A diatomic ideal gas occupies 4.0 L and pressure of 100kPa. It is compressed adiabatically to 1/4th its original volume, then cooled at constant volume back to its original temperature. Finally, it is allowed to isothermally expand back to
its original volume.
A. Draw a PV diagram B. Find the Heat, Work, and Change in Energy for each process (Fill in Table). Do not assume anything about the net values to fill in the
values for a process.
C. What is net heat and work done?
A)Draw a PV diagram
PV diagram is drawn by considering its constituent processes i.e. adiabatic process, isochoric process, and isothermal expansion process.
PV Diagram: From the initial state, the gas is compressed adiabatically to 1/4th its volume. This is a curve process and occurs without heat exchange. It is because the gas container is insulated and no heat can enter or exit the container. The second process is cooling at a constant volume. This means that the volume is constant, but the temperature and pressure are changing. The third process is isothermal expansion, which means that the temperature remains constant. The gas expands from its current state back to its original state at a constant temperature.
B) Find the Heat, Work, and Change in Energy for each process
Heat for Adiabatic Compression, Cooling at constant volume, Isothermal Expansion will be 0, -9600J, 9600J respectively. work will be -7200J, 0J, 7200J respectively. Change in Energy will be -7200J, -9600J, 2400J.
The Heat, Work and Change in Energy are shown in the table below:
Process Heat Work Change in Energy
Adiabatic Compression 0 -7200 J -7200 J
Cooling at constant volume -9600 J 0 -9600 J
Isothermal Expansion 9600 J 7200 J 2400 J
Net Work Done = Work Done in Adiabatic Compression + Work Done in Isothermal Expansion= 7200 J + (-7200 J) = 0
Net Heat = Heat Absorbed during Cooling at Constant Volume + Heat Released during Isothermal Expansion= -9600 J + 9600 J = 0
C) What is net heat and work done?
The net heat and work done are both zero.
Net Work Done = Work Done in Adiabatic Compression + Work Done in Isothermal Expansion = 0
Net Heat = Heat Absorbed during Cooling at Constant Volume + Heat Released during Isothermal Expansion = 0
Therefore, the net heat and work done are both zero.
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3. What would happen if you put an object at the focal point of the lens? 4. What would happen if you put an object at the focal point of the mirror? 5. What would happen if you put an object between the focal point and the lens? 6. What would happen if you put an object between the focal point and the mirror?
The specific placement of an object relative to the focal point of a lens or mirror determines the characteristics of the resulting image, such as its nature (real or virtual), size, and orientation.
Let's provide a more detailed explanation for each scenario:
3. Placing an object at the focal point of a lens:
When an object is placed exactly at the focal point of a lens, the incident rays from the object become parallel to each other after passing through the lens. This occurs because the lens refracts (bends) the incoming rays in such a way that they converge at the focal point on the opposite side. However, when the object is positioned precisely at the focal point, the refracted rays become parallel and do not converge to form a real image. Therefore, in this case, no real image is formed on the other side of the lens.
4. Placing an object at the focal point of a mirror:
If an object is positioned at the focal point of a mirror, the reflected rays will appear to be parallel to each other. This happens because the light rays striking the mirror surface are reflected in a way that they diverge as if they were coming from the focal point behind the mirror. Due to this divergence, the rays never converge to form a real image. Instead, the reflected rays appear to originate from a virtual image located at infinity. Consequently, no real image can be projected onto a screen or surface.
5. Placing an object between the focal point and the lens:
When an object is situated between the focal point and a converging lens, a virtual image is formed on the same side as the object. The image appears magnified and upright. The lens refracts the incoming rays in such a way that they diverge after passing through the lens. The diverging rays extend backward to intersect at a point where the virtual image is formed. This image is virtual because the rays do not actually converge at that point. The virtual image is larger in size than the object, making it appear magnified.
6. Placing an object between the focal point and the mirror:
Similarly, when an object is placed between the focal point and a concave mirror, a virtual image is formed on the same side as the object. The virtual image is magnified and upright. The mirror reflects the incoming rays in such a way that they diverge after reflection. The diverging rays appear to originate from a point behind the mirror, where the virtual image is formed. Again, the virtual image is larger than the object and is not a real convergence point of light rays.
In summary, the placement of an object relative to the focal point of a lens or mirror determines the behavior of the light rays and the characteristics of the resulting image. These characteristics include the nature of the image (real or virtual), its size, and its orientation (upright or inverted).
Note: In both cases (5 and 6), the images formed are virtual because the light rays do not actually converge or intersect at a point.
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A spherical mirror is to be used to form an image 5.90 times the size of an object on a screen located 4.40 m from the object. (a) Is the mirror required concave or convex? concave convex (b) What is the required radius of curvature of the mirror? m (c) Where should the mirror be positioned relative to the object? m from the object
The mirror required is concave. The radius of curvature of the mirror is -1.1 m. The mirror should be positioned at a distance of 0.7458 m from the object.
Given,
Image height (hᵢ) = 5.9 times the object height (h₀)
Screen distance (s) = 4.40 m
Let us solve each part of the question :
Is the mirror required concave or convex? We know that the magnification (M) for a spherical mirror is given by: Magnification,
M = - (Image height / Object height)
Also, the image is real when the magnification (M) is negative. So, we can write:
M = -5.9
[Given]Since, M is negative, the image is real. Thus, we require a concave mirror to form a real image.
What is the required radius of curvature of the mirror? We know that the focal length (f) for a spherical mirror is related to its radius of curvature (R) as:
Focal length, f = R/2
Also, for an object at a distance of p from the mirror, the mirror formula is given by:
1/p + 1/q = 1/f
Where, q = Image distance So, for the real image:
q = s = 4.4 m
Substituting the values in the mirror formula, we get:
1/p + 1/4.4 = 1/f…(i)
Also, from the magnification formula:
M = -q/p
Substituting the values, we get:
-5.9 = -4.4/p
So, the object distance is: p = 0.7458 m
Substituting this value in equation (i), we get:
1/0.7458 + 1/4.4 = 1/f
Solving further, we get:
f = -0.567 m
Since the focal length is negative, the mirror is a concave mirror.
Therefore, the radius of curvature of the mirror is:
R = 2f
R = 2 x (-0.567) m
R = -1.13 m
R ≈ -1.1 m
Where should the mirror be positioned relative to the object? We know that the object distance (p) is given by:
p = -q/M Substituting the given values, we get:
p = -4.4 / 5.9
p = -0.7458 m
We know that the mirror is to be placed between the object and its focus. So, the mirror should be positioned at a distance of 0.7458 m from the object.
Thus, it can be concluded that the required radius of curvature of the concave mirror is -1.1 m. The concave mirror is to be positioned at a distance of 0.7458 m from the object.
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A closely wound, circular coil with a diameter of 4.10 cmcm has 700 turns and carries a current of 0.460 AA .
What is the magnitude of the magnetic field at a point on the axis of the coil a distance of 6.30 cmcm from its center?
Express your answer in teslas.
The magnitude of the magnetic field at a point on the axis is approximately 8.38 x 10^(-5) T.
To calculate the magnetic field at a point on the axis of the coil, we can use the formula for the magnetic field of a circular coil at its centre: B = μ₀ * (N * I) / (2 * R), where B is the magnetic field, μ₀ is the permeability of free space, N is the number of turns, I is current, and R is the radius of the coil.
In this case, the radius is half the diameter, so R = 2.05 cm. Plugging in the values, we get B = (4π × 10^(-7) T·m/A) * (700 * 0.460 A) / (2 * 2.05 × 10^(-2) m) ≈ 8.38 × 10^(-5) T.
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All work/steps must be shown following the "Problem-Solving Procedure". Part II - Short Problems −4 points 1. Find the ' x ' and ' y ' components of the following vectors. a. F=67.9 N,38∘ b. v=8.76 m/s,−57.3∘ 2. Determine the 'polar coordinate' form of the following vector components. a. Ax=7.87 mAy=−8.43 m b. vx=−67.3 m/svy=−24.9 m/s
In problem 1, the x and y components of the vector F are found to be 50.19 N and 51.95 N, respectively. In problem 2, the polar coordinate form of vector A is determined to be 11.01 m at an angle of -48.92 degrees, while vector v is expressed as 76.46 m/s at an angle of -197.65 degrees.
In problem 1a, the vector force F, is given with a magnitude of 67.9 N and an angle of 38 degrees. To find the x and y components, we use the trigonometric functions cosine (cos) and sine (sin).
The x component is calculated as Fx = F * cos(θ), where θ is the angle, yielding Fx = 67.9 N * cos(38°) = 50.19 N. Similarly, the y component is determined as Fy = F * sin(θ), resulting in Fy = 67.9 N * sin(38°) = 51.95 N.
In problem 1b, the vector v is given with a magnitude of 8.76 m/s and an angle of -57.3 degrees. Using the same trigonometric functions, we can find the x and y components.
The x component is calculated as vx = v * cos(θ), which gives vx = 8.76 m/s * cos(-57.3°) = 4.44 m/s. The y component is determined as vy = v * sin(θ), resulting in vy = 8.76 m/s * sin(-57.3°) = -7.37 m/s.
In problem 2a, the vector components Ax = 7.87 m and Ay = -8.43 m are given. To express this vector in polar coordinate form, we can use the Pythagorean theorem to find the magnitude (r) of the vector, which is r = √(Ax^2 + Ay^2).
Substituting the given values, we obtain r = √((7.87 m)^2 + (-8.43 m)^2) ≈ 11.01 m. The angle (θ) can be determined using the inverse tangent function, tan^(-1)(Ay/Ax), which gives θ = tan^(-1)(-8.43 m/7.87 m) ≈ -48.92 degrees.
Therefore, the polar coordinate form of vector A is approximately 11.01 m at an angle of -48.92 degrees.In problem 2b, the vector components vx = -67.3 m/s and vy = -24.9 m/s are given.
Following a similar procedure as in problem 2a, we find the magnitude of the vector v as r = √(vx^2 + vy^2) = √((-67.3 m/s)^2 + (-24.9 m/s)^2) ≈ 76.46 m/s.
The angle θ can be determined using the inverse tangent function, tan^(-1)(vy/vx), resulting in θ = tan^(-1)(-24.9 m/s/-67.3 m/s) ≈ -197.65 degrees. Hence, the polar coordinate form of vector v is approximately 76.46 m/s at an angle of -197.65 degrees.
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if an eye is farsighted the image defect is:
a) distant objects image is formed in front of the retina
b) near objects image is formed behind the retina
c) lens of the eye cannot focus on distant objects
d) two of the above
If an eye is farsighted the image defect is that distant objects image is formed in front of the retina. Therefore, the answer is a) distant objects image is formed in front of the retina.
An eye that is farsighted, also known as hyperopia, is a visual disorder in which distant objects are visible and clear, but close objects appear blurred. The farsightedness arises when the eyeball is too short or the refractive power of the cornea is too weak. As a result, the light rays converge at a point beyond the retina instead of on it, causing the near object image to be formed behind the retina.
Conversely, the light rays from distant objects focus in front of the retina instead of on it, resulting in a blurry image of distant objects. Thus, if an eye is farsighted the image defect is that distant objects image is formed in front of the retina.
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Concept Simulation 26.4 provides the option of exploring the ray diagram that applies to this problem. The distance between an object and its image formed by a diverging lens is 7.50 cm. The focal length of the lens is -4.30 cm. Find (a) the image distance and (b) the object distance.
The image distance for an object formed by a diverging lens with a focal length of -4.30 cm is determined to be 7.50 cm, and we need to find the object distance.
To find the object distance, we can use the lens formula, which states:
1/f = 1/v - 1/u
Where:
f is the focal length of the lens,
v is the image distance,
u is the object distance.
f = -4.30 cm (negative sign indicates a diverging lens)
v = 7.50 cm
Let's plug in the values into the lens formula and solve for u:
1/-4.30 = 1/7.50 - 1/u
Multiply through by -4.30 to eliminate the fraction:
-1 = (-4.30 / 7.50) + (-4.30 / u)
-1 = (-4.30u + 7.50 * -4.30) / (7.50 * u)
Multiply both sides by (7.50 * u) to get rid of the denominator:
-7.50u = -4.30u + 7.50 * -4.30
Combine like terms:
-7.50u + 4.30u = -32.25
-3.20u = -32.25
Divide both sides by -3.20 to solve for u:
u = -32.25 / -3.20
u ≈ 10.08 cm
Therefore, the object distance is approximately 10.08 cm.
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[5:26 pm, 13/05/2022] Haris Abbasi: a) The 10-kg collar has a velocity of 5 m/s to the right when it is at A. It then travels along the
smooth guide. Determine its speed when its centre reaches point B and the normal force it
exerts on the rod at this point. The spring has an unstretched length of 100 mm and B is located
just before the end of the curved portion of the rod. The whole system is in a vertical plane. (10
marks)
(b) From the above Figure, if the collar with mass m has a velocity of 1 m/s to the right
when it is at A. It then travels along the smooth guide. It stop at Point B. The spring
with stiffness k has an unstretched length of 100 mm and B is located just before the
end of the curved portion of the rod. The whole system is in a vertical plane. Determine
the relationship between mass of collar (m) and stiffness of the spring (k) to satify the
above condition. (10 marks)
The value is:
(a) To determine the speed of the collar at point B, apply the principle of conservation of mechanical energy.
(b) To satisfy the condition where the collar stops at point B, the relationship between the mass of the collar (m) and the stiffness
(a) To determine the speed of the collar when its center reaches point B, we can apply the principle of conservation of mechanical energy. Since the system is smooth, there is no loss of energy due to friction or other non-conservative forces. Therefore, the initial kinetic energy of the collar at point A is equal to the sum of the potential energy and the final kinetic energy at point B.
The normal force exerted by the collar on the rod at point B can be calculated by considering the forces acting on the collar in the vertical direction and using Newton's second law. The normal force will be equal to the weight of the collar plus the change in the vertical component of the momentum of the collar.
(b) In this scenario, the collar stops at point B. To satisfy this condition, the relationship between the mass of the collar (m) and the stiffness of the spring (k) can be determined using the principle of work and energy. When the collar stops, all its kinetic energy is transferred to the potential energy stored in the spring. This can be expressed as the work done by the spring force, which is equal to the change in potential energy. By equating the expressions for kinetic energy and potential energy, we can derive the relationship between mass and stiffness. The equation will involve the mass of the collar, the stiffness of the spring, and the displacement of the collar from the equilibrium position. Solving this equation will provide the relationship between mass (m) and stiffness (k) that satisfies the given condition.
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A beam of light reflects and refracts at point A on the interface between material 1 (n1 = 1.33) and material 2 (n2 = 1.66). The incident beam makes an angle of 40° with the interface. What is the angle of reflection at point A?
The angle of reflection at point A is 40°, which is equal to the angle of incidence.
When a beam of light encounters an interface between two different materials, it undergoes reflection and refraction. The angle of incidence, which is the angle between the incident beam and the normal to the interface, is equal to the angle of reflection, which is the angle between the reflected beam and the normal to the interface.
In this case, the incident beam makes an angle of 40° with the interface, so the angle of reflection at point A is also 40°. When light travels from one medium to another, it changes its direction due to the change in speed caused by the change in refractive index.
The law of reflection states that the angle of incidence is equal to the angle of reflection. This means that the angle at which the light ray strikes the interface is the same as the angle at which it bounces off the interface.
In this scenario, the incident beam of light strikes the interface between material 1 and material 2 at an angle of 40°. According to the law of reflection, the angle of reflection is equal to the angle of incidence, so the light ray will bounce off the interface at the same 40° angle with respect to the normal.
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A mass attached to the end of a spring is oscillating with a period of 2.25s on a horontal Inctionless surface. The mass was released from restat from the position 0.0460 m (a) Determine the location of the mass att - 5.515 m (b) Determine if the mass is moving in the positive or negative x direction at t-5515. O positive x direction O negative x direction
a) The location of the mass at -5.515 m is not provided.
(b) The direction of motion at t = -5.515 s cannot be determined without additional information.
a)The location of the mass at -5.515 m is not provided in the given information. Therefore, it is not possible to determine the position of the mass at that specific point.
(b) To determine the direction of motion at t = -5.515 s, we need additional information. The given data only includes the period of oscillation and the initial position of the mass. However, information about the velocity or the phase of the oscillation is required to determine the direction of motion at a specific time.
In an oscillatory motion, the mass attached to a spring moves back and forth around its equilibrium position. The direction of motion depends on the phase of the oscillation at a particular time. Without knowing the phase or velocity of the mass at t = -5.515 s, we cannot determine whether it is moving in the positive or negative x direction.
To accurately determine the direction of motion at a specific time, additional information such as the amplitude, phase, or initial velocity would be needed.
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Three resistors, each having a resistance of 30 Q2, are connected in parallel with each other. What is the value of their effective resistance? A string of 50 identical tree lights connected in series dissipates 100 W when connected to a 120 V power outlet. What is the equivalent resistance of the string?
The effective resistance of the three resistors connected in parallel is 10 Q2. To find the effective resistance of resistors connected in parallel, you can use the formula:
1/Req = 1/R1 + 1/R2 + 1/R3 + ...
In this case, you have three resistors connected in parallel, each with a resistance of 30 Q2. So, we can substitute these values into the formula:
1/Req = 1/30 Q2 + 1/30 Q2 + 1/30 Q2
1/Req = 3/30 Q2
1/Req = 1/10 Q2
Req = 10 Q2
Therefore, the effective resistance of the three resistors connected in parallel is 10 Q2.
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The magnetic flux through a coil containing 10 loops changes
from 10Wb to −20W b in 0.02s. Find the induced voltage ε.
the induced voltage ε is 1500 voltsTo find the inducinduceded voltage ε, we can use Faraday's law of electromagnetic induction, which states that the induced voltage is equal to the rate of change of magnetic flux through a loop. Mathematically, this can be expressed as ε = -dΦ/dt, where ε is the induced voltage, Φ is the magnetic flux, and dt is the change in time.
Given that the magnetic flux changes from 10 Wb to -20 Wb in 0.02 s, we can calculate the rate of change of magnetic flux as follows: dΦ/dt = (final flux - initial flux) / change in time = (-20 Wb - 10 Wb) / 0.02 s = -1500 Wb/s.
Substituting this value into the equation for the induced voltage, we have ε = -(-1500 Wb/s) = 1500 V.
Therefore, the induced voltage ε is 1500 volts.
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A student measured the mass of a meter stick to be 150 gm. The student then placed a knife edge on 30-cm mark of the stick. If the student placed a 500-gm weight on 5-cm mark and a 300-gm weight on somewhere on the meter stick, the meter stick then was balanced. Where (cm mark) did the student place the 300- gram weight?
Therefore, the student placed the 300-gram weight at 38.33 cm mark to balance the meter stick.
Given data:A student measured the mass of a meter stick to be 150 gm.
A knife edge was placed on 30-cm mark of the stick.
A 500-gm weight was placed on 5-cm mark and a 300-gm weight was placed somewhere on the meter stick. The meter stick was balanced.
Let's assume that the 300-gm weight is placed at x cm mark.
According to the principle of moments, the moment of the force clockwise about the fulcrum is equal to the moment of force anticlockwise about the fulcrum.
Now, the clockwise moment is given as:
M1 = 500g × 5cm
= 2500g cm
And, the anticlockwise moment is given as:
M2 = 300g × (x - 30) cm
= 300x - 9000 cm (Because the knife edge is placed on the 30-cm mark)
According to the principle of moments:
M1 = M2 ⇒ 2500g cm
= 300x - 9000 cm⇒ 2500
= 300x - 9000⇒ 300x
= 2500 + 9000⇒ 300x
= 11500⇒ x = 11500/300⇒ x
= 38.33 cm
Therefore, the student placed the 300-gram weight at 38.33 cm mark to balance the meter stick.
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A muon with a lifetime of 2 × 10−6 second in its frame of reference is created in the upper atmosphere with a velocity of 0.998 c toward the Earth. What is the lifetime of this muon as mea- sured by an observer on the Earth? 1.T =3×10−5 s 2.T =3×10−6 s 3.T =3×10−4 s 4.T =3×10−3 s 5.T =3×10−2 s
The lifetime of the muon as measured by an observer on Earth is approximately 3 × 10^−6 seconds (Option 2).
When the muon is moving at a velocity of 0.998c towards the Earth, time dilation occurs due to relativistic effects, causing the muon's lifetime to appear longer from the Earth's frame of reference.
Time dilation is a phenomenon predicted by Einstein's theory of relativity, where time appears to slow down for objects moving at high velocities relative to an observer. The formula for time dilation is T' = T / γ, where T' is the measured lifetime of the muon, T is the proper lifetime in its frame of reference, and γ (gamma) is the Lorentz factor.
In this case, the Lorentz factor can be calculated using the formula γ = 1 / sqrt(1 - (v^2 / c^2)), where v is the velocity of the muon (0.998c) and c is the speed of light. Plugging in the values, we find γ ≈ 14.14.
By applying time dilation, T' = T / γ, we get T' = 2 × 10^−6 s / 14.14 ≈ 1.415 × 10^−7 s. However, we need to convert this result to the proper lifetime as measured by the Earth observer. Since the muon is moving towards the Earth, its lifetime appears longer due to time dilation. Therefore, the measured lifetime on Earth is T' = 1.415 × 10^−7 s + 2 × 10^−6 s = 3.1415 × 10^−6 s ≈ 3 × 10^−6 s.
Hence, the lifetime of the muon as measured by an observer on Earth is approximately 3 × 10^−6 seconds (Option 2).
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The diameter of an oxygen (02) molecule is approximately 0.300 nm.
For an oxygen molecule in air at atmospheric pressure and 18.3°C, estimate the total distance traveled during a 1.00-s time interval.
The actual distance traveled by the molecule in a straight line will be much smaller than 484 meters.
The mean free path of a gas molecule is the average distance it travels between collisions with other molecules. At atmospheric pressure and 18.3°C, the mean free path of an oxygen molecule is approximately 6.7 nm.
During a 1.00-s time interval, an oxygen molecule will travel a distance equal to the product of its speed and the time interval. The speed of an oxygen molecule at atmospheric pressure and 18.3°C can be estimated using the root-mean-square speed equation:
[tex]v_{rms}[/tex] = √(3kT/m)
where k is Boltzmann's constant, T is the temperature in Kelvin, and m is the mass of the molecule.
For an oxygen molecule, [tex]k = 1.38 * 10^{-23}[/tex] J/K, T = 291.45 K (18.3°C + 273.15), and [tex]m = 5.31 * 10^{-26}[/tex] kg.
Plugging in the values, we get:
[tex]v_{rms} = \sqrt {(3 * 1.38 * 10^{-23} J/K * 291.45 K / 5.31 * 10^{-26} kg)} = 484 m/s[/tex]
Therefore, during a 1.00-s time interval, an oxygen molecule will travel approximately:
distance = speed * time = 484 m/s * 1.00 s ≈ 484 meters
However, we need to take into account that the oxygen molecule will collide with other molecules in the air, and its direction will change randomly after each collision. The actual distance traveled by the molecule in a straight line will be much smaller than 484 meters, and will depend on the number of collisions it experiences during the time interval. Therefore, the estimate of the total distance traveled by an oxygen molecule in air during a 1.00-s time interval should be considered a very rough approximation.
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Finnish saunas can reach temperatures as high as 130 - 140 degrees Celcius - which extreme sauna enthusiasts can tolerate in short bursts of 3 - 4 minutes. Calculate the heat required to convert a 0.8 kg block of ice, brought in from an outside temperature of -8 degrees Celcius, to steam at 104.0 degrees Celcius in the sauna. [The specific heat capacity of water vapour is 1.996 kJ/kg/K; see the lecture notes for the other specific heat capacities and specific latent heats].
To calculate heat required to convert a 0.8 kg block of ice to steam at 104.0 degrees Celsius in a sauna, we need to consider stages of phase change and specific heat capacities and specific latent heats involved.
First, we need to calculate the heat required to raise the temperature of the ice from -8 degrees Celsius to its melting point at 0 degrees Celsius. The specific heat capacity of ice is 2.09 kJ/kg/K. The equation for this heat transfer is:
Q1 = mass * specific heat capacity * temperature change
Q1 = 0.8 kg * 2.09 kJ/kg/K * (0 - (-8)) degrees Celsius. Next, we calculate the heat required to melt the ice at 0 degrees Celsius. The specific latent heat of fusion for ice is 334 kJ/kg. The equation for this heat transfer is:
Q2 = mass * specific latent heat
Q2 = 0.8 kg * 334 kJ/kg
After the ice has melted, we need to calculate the heat required to raise the temperature of the water from 0 degrees Celsius to 100 degrees Celsius. The specific heat capacity of water is 4.18 kJ/kg/K. The equation for this heat transfer is:
Q3 = mass * specific heat capacity * temperature change
Q3 = 0.8 kg * 4.18 kJ/kg/K * (100 - 0) degrees Celsius
Finally, we calculate the heat required to convert the water at 100 degrees Celsius to steam at 104.0 degrees Celsius. The specific latent heat of vaporization for water is 2260 kJ/kg. The equation for this heat transfer is:
Q4 = mass * specific latent heat
Q4 = 0.8 kg * 2260 kJ/kg
The total heat required is the sum of Q1, Q2, Q3, and Q4:
Total heat = Q1 + Q2 + Q3 + Q4
Calculating these values will give us the heat required to convert the ice block to steam in the sauna.
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1. In what pattern does electricity flow in an AC circuit? A. dash B. dots C. straight D. wave 2. How does an electron move in a DC? A. negative to positive B. negative to negative C. posititve to negative D. positive to positive 3. In what type of LC circuit does total current be equal to the current of inductor and capacitor? A. series LC circuit B. parallel LC circuit C. series-parallel LC circuit D. all of the above 4. In what type of LC circuit does total voltage is equal to the current of inductor and capacitor? A. series LC circuit B. parallel LC circuit NG PASIC OF PASIG VOISINIO אני אמות KALAKHAN IA CITY MAYNILA 1573 PASIG CITY C. series-parallel LC circuit D. all of the above 5. If the capacitance in the circuit is increased, what will happen to the frequency?? A. increase B. decrease C. equal to zero D. doesn't change
Answer:
1.) D. wave
In an AC circuit, the electric current flows back and forth, creating a wave-like pattern.
2.) A. negative to positive
In a DC circuit, electrons flow from the negative terminal of a battery to the positive terminal.
3.) A. series LC circuit
In a series LC circuit, the current through the inductor and capacitor are equal and in the same direction.
4.) B. parallel LC circuit
In a parallel LC circuit, the voltage across the inductor and capacitor are equal and in the opposite direction.
5.) B. decrease
As the capacitance in a circuit increases, the resonant frequency decreases.
Explanation:
AC circuits: AC circuits are circuits that use alternating current (AC). AC is a type of electrical current that flows back and forth, reversing its direction at regular intervals. The frequency of an AC circuit is the number of times the current reverses direction per second.
DC circuits: DC circuits are circuits that use direct current (DC). DC is a type of electrical current that flows in one direction only.
LC circuits: LC circuits are circuits that contain an inductor and a capacitor. The inductor stores energy in the form of a magnetic field, and the capacitor stores energy in the form of an electric field. When the inductor and capacitor are connected together, they can transfer energy back and forth between each other, creating a resonant frequency.
Resonant frequency: The resonant frequency of a circuit is the frequency at which the circuit's impedance is minimum. The resonant frequency of an LC circuit is determined by the inductance of the inductor and the capacitance of the capacitor.
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If an applied force on an object acts antiparallel to the direction of the object's movement, the work done on by the applied force is: Negative Cannot be determined by the problem. Positive Zero
If an applied force on an object acts antiparallel to the direction of the object's movement, the work done by the applied force is negative.
The transfer of energy from one object to another by applying a force to an object, which makes it move in the direction of the force is known as work. When the applied force acts in the opposite direction to the object's movement, the work done by the force is negative.
The formula for work is given by: Work = force x distance x cosθ where,θ is the angle between the applied force and the direction of movement. If the angle between force and movement is 180° (antiparallel), then cosθ = -1 and work done will be negative. Therefore, if an applied force on an object acts antiparallel to the direction of the object's movement, the work done by the applied force is negative.
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Explain in detail why a photon's wavelength must increase when
it scatters from a particle at rest.
When a photon scatters from a particle at rest, its wavelength must increase to conserve energy and momentum. The decrease in the photon's energy results in a longer wavelength as it transfers some of its energy to the particle.
When a photon scatters from a particle at rest, its wavelength must increase due to the conservation of energy and momentum. Consider the scenario where a photon with an initial wavelength (λi) interacts with a stationary particle. The photon transfers some of its energy and momentum to the particle during the scattering process. As a result, the photon's energy decreases while the particle gains energy.
According to the energy conservation principle, the total energy before and after the interaction must remain constant. Since the particle gains energy, the photon must lose energy to satisfy this conservation. Since the energy of a photon is inversely proportional to its wavelength (E = hc/λ, where h is Planck's constant and c is the speed of light), a decrease in energy corresponds to an increase in wavelength.
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C. Density Determination - Measurement (pyrex beaker, ruler or meter stick, wood block) 1) Design an experiment to find out the density of the wood block using only a beaker, water, and a meter stick. Do not use a weighing scale for this part. 2) Design a second, different experiment to measure the density of the wood block. You can use a weighing scale for this part. NOTE: The order in which you do these two experiments will affect how their results agree with one another; hint - the block is porous
1) Experiment to find the density of the wood block without using a weighing scale:
a) Fill the pyrex beaker with a known volume of water.
b) Measure and record the initial water level in the beaker.
c) Carefully lower the wood block into the water, ensuring it is fully submerged.
d) Measure and record the new water level in the beaker.
e) Calculate the volume of the wood block by subtracting the initial water level from the final water level.
f) Divide the mass of the wood block (obtained from the second experiment) by the volume calculated in step e to determine the density of the wood block.
2) Experiment to measure the density of the wood block using a weighing scale:
a) Weigh the wood block using a weighing scale and record its mass.
b) Fill the pyrex beaker with a known volume of water.
c) Measure and record the initial water level in the beaker.
d) Carefully lower the wood block into the water, ensuring it is fully submerged.
e) Measure and record the new water level in the beaker.
f) Calculate the volume of the wood block by subtracting the initial water level from the final water level.
g) Divide the mass of the wood block by the volume calculated in step f to determine the density of the wood block.
Comparing the results from both experiments will provide insights into the porosity of the wood block. If the density calculated in the first experiment is lower than in the second experiment, it suggests that the wood block is porous and some of the water has been absorbed.
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What is the frequency of the most intense radiation emitted by your body? Assume a skin temperature of 95 °F. Express your answer to three significant figures.
The frequency of the most intense radiation emitted by your body is approximately 3.19 × 10^13 Hz.
To determine the frequency of the most intense radiation emitted by your body, we can use Wien's displacement law, which relates the temperature of a black body to the wavelength at which it emits the most intense radiation.
The formula for Wien's displacement law is:
λ_max = (b / T)
Where λ_max is the wavelength of maximum intensity, b is Wien's displacement constant (approximately 2.898 × 10^-3 m·K), and T is the temperature in Kelvin.
First, let's convert the skin temperature of 95 °F to Kelvin:
T = (95 + 459.67) K ≈ 308.15 K
Now, we can calculate the wavelength of maximum intensity using Wien's displacement law:
λ_max = (2.898 × 10^-3 m·K) / 308.15 K
Calculating this expression, we find:
λ_max ≈ 9.41 × 10^-6 m
To find the frequency, we can use the speed of light formula:
c = λ * f
Where c is the speed of light (approximately 3 × 10^8 m/s), λ is the wavelength, and f is the frequency.
Rearranging the formula to solve for frequency:
f = c / λ_max
Substituting the values, we have:
f ≈ (3 × 10^8 m/s) / (9.41 × 10^-6 m)
Calculating this expression, we find:
f ≈ 3.19 × 10^13 Hz
Therefore, the frequency of the most intense radiation emitted by your body is approximately 3.19 × 10^13 Hz.
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A sound wave is modeled as AP = 2.09 Pa sin(51.19 m 1 .3 – 17405 s ..t). What is the maximum change in pressure, the wavelength, the frequency, and the speed of the sound wave?
The maximum change in pressure is 2.09 Pa, the wavelength is approximately 0.123 m, the frequency is around 2770.4 Hz, and the speed of the sound wave is approximately 340.1 m/s.
To determine the maximum change in pressure, we can look at the amplitude of the wave. In the given model, the amplitude (A) is 2.09 Pa, so the maximum change in pressure is 2.09 Pa.
Next, let's find the wavelength of the sound wave. The wavelength (λ) is related to the wave number (k) by the equation λ = 2π/k. In this case, the wave number is given as 51.19 m^(-1), so we can calculate the wavelength using [tex]\lambda = 2\pi /51.19 m^{-1} \approx 0.123 m[/tex].
The frequency (f) of the sound wave can be determined using the equation f = ω/2π, where ω is the angular frequency. From the given model, we have ω = 17405 s⁻¹, so the frequency is
[tex]f \approx 17405/2\pi \approx 2770.4 Hz[/tex].
Finally, the speed of the sound wave (v) can be calculated using the equation v = λf. Plugging in the values we get,
[tex]v \approx 0.123 m \times 2770.4 Hz \approx 340.1 m/s[/tex].
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A dry cell having internal resistance r = 0.5 Q has an electromotive force & = 6 V. What is the power (in W) dissipated through the internal resistance of the cell, if it is connected to an external resistance of 1.5 Q?
I. 4.5 II. 5.5 III.3.5 IV. 2.5 V. 6.5
The power (in W) dissipated through the internal resistance of the cell, if it is connected to an external resistance of 1.5 Q is 4.5 W. Hence, the correct option is I. 4.5.
The expression for the power (in W) dissipated through the internal resistance of the cell, if it is connected to an external resistance of 1.5 Q is as follows:
Given :The internal resistance of a dry cell is `r = 0.5Ω`.
The electromotive force of a dry cell is `ε = 6 V`.The external resistance is `R = 1.5Ω`.Power is given by the expression P = I²R. We can use Ohm's law to find current I flowing through the circuit.I = ε / (r + R) Substituting the values of ε, r and R in the above equation, we getI = 6 / (0.5 + 1.5)I = 6 / 2I = 3 A Therefore, the power dissipated through the internal resistance isP = I²r = 3² × 0.5P = 4.5 W Therefore, the power (in W) dissipated through the internal resistance of the cell, if it is connected to an external resistance of 1.5 Q is 4.5 W. Hence, the correct option is I. 4.5.
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3. (4 points) A dog chewed a smoke detector into pieces and swallowed its Am-241 radioactive source. The source has an activity of 37 kBq primarily composed of alpha particles with an energy of 5.486 MeV per decay. A tissue mass of 0.25 kg of the dog's intestine completely absorbed the alpha particle energy as the source traveled through his digestive tract. The source was then "passed" in the dog's feces after 12 hours. Assume that the RBE for an alpha particle is 10. Calculate: a) the total Absorbed Energy expressed in the correct units b) the Absorbed Dose expressed in the correct units c) the Dose Equivalent expressed in the correct units d) the ratio of the dog's Dose Equivalent to the recommended annual human exposure
a) Total Absorbed Energy:
The absorbed energy is the product of the activity (in decays per second) and the energy per decay (in joules). We need to convert kilobecquerels to becquerels and megaelectronvolts to joules.
Total Absorbed Energy = Activity × Energy per decay
Total Absorbed Energy ≈ 3.04096 × 10^(-6) J
b) Absorbed Dose:
The absorbed dose is the absorbed energy divided by the mass of the tissue.
Absorbed Dose = Total Absorbed Energy / Tissue Mass
Absorbed Dose = 3.04096 × 10^(-6) J / 0.25 kg
Absorbed Dose = 12.16384 μGy (since 1 Gy = 1 J/kg, and 1 μGy = 10^(-6) Gy)
c) Dose Equivalent:
The dose equivalent takes into account the relative biological effectiveness (RBE) of the radiation. We multiply the absorbed dose by the RBE value for alpha particles.
Dose Equivalent = 121.6384 μSv (since 1 Sv = 1 Gy, and 1 μSv = 10^(-6) Sv)
Ratio = Dose Equivalent (Dog) / Recommended Annual Human Exposure
Ratio = 121.6384 μSv / 1 mSv
Ratio = 0.1216384
Therefore, the ratio of the dog's dose equivalent to the recommended annual human exposure is approximately 0.1216384.
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A cockroach of mass m lies on the rim of a uniform disk of mass 7.00 m that can rotate freely about its center like a merry-go-round. Initially the cockroach and disk rotate together with an angular velocity of 0.200 rad. Then the cockroach walks halfway to the
center of the disk.
(a) What then is the angular velocity of the cockroach-disk system?
(b) What is the ratio K/Ko of the new kinetic energy of the system to its initial kinetic energy?
(a) The angular velocity of the cockroach-disk system after the cockroach walks halfway to the centre of the disk is 0.300 rad.
(b) The ratio K/Ko of the new kinetic energy of the system to its initial kinetic energy is 0.700.
When the cockroach walks halfway to the centre of the disk, it decreases its distance from the axis of rotation, effectively reducing the moment of inertia of the system. Since angular momentum is conserved in the absence of external torques, the reduction in moment of inertia leads to an increase in angular velocity. Using the principle of conservation of angular momentum, the final angular velocity can be calculated by considering the initial and final moments of inertia. In this case, the moment of inertia of the system decreases by a factor of 4, resulting in an increase in angular velocity to 0.300 rad.
The kinetic energy of a rotating object is given by the equation K = (1/2)Iω^2, where K is the kinetic energy, I is the moment of inertia, and ω is the angular velocity. Since the moment of inertia decreases by a factor of 4 and the angular velocity increases by a factor of 1.5, the ratio K/Ko of the new kinetic energy to the initial kinetic energy is (1/2)(1/4)(1.5^2) = 0.700. Therefore, the new kinetic energy is 70% of the initial kinetic energy.
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5) A beaker contains 2 grams of ice at a temperature of -10°C. The mass of the beaker may be ignored. Heat is supplied to the beaker at a constant rate of 2200J/minute. The specific heat of ice is 2100 J/kgk and the heat of fusion for ice is 334 x103 J/kg. How much time passes before the ice starts to melt? (8 pts)
The time it takes for the ice to start melting is approximately 8.22 minutes.
To calculate the time before the ice starts to melt, we need to consider the heat required to raise the temperature of the ice from -10°C to its melting point (0°C) and the heat of fusion required to convert the ice at 0°C to water at the same temperature.
First, we calculate the heat required to raise the temperature of 2 grams of ice from -10°C to 0°C using the specific heat formula Q = m * c * ΔT, where Q is the heat, m is the mass, c is the specific heat, and ΔT is the change in temperature. Substituting the given values, we get Q1 = 2 g * 2100 J/kg°C * (0°C - (-10°C)) = 42000 J.
Next, we calculate the heat of fusion required to convert the ice to water at 0°C using the formula Q = m * Hf, where Q is the heat, m is the mass, and Hf is the heat of fusion. Substituting the given values, we get Q2 = 2 g * 334 x 10³ J/kg = 668000 J.
Now, we sum up the heat required for temperature rise and the heat of fusion: Q_total = Q1 + Q2 = 42000 J + 668000 J = 710000 J.
Finally, we divide the total heat by the heat supplied per minute to obtain the time: t = Q_total / (2200 J/minute) ≈ 322.73 minutes ≈ 8.22 minutes.
Therefore, it takes approximately 8.22 minutes for the ice to start melting when heat is supplied at a constant rate of 2200 J/minute.
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The electronic density of a metal is 4.2*1024 atoms/m3 and has a refraction index n = 1.53 + i2.3.
a)find the plasma frequency. The charge of electrons is qe = 1.6*10-19C and the mass of these e- is me=9.1*10-31kg , єo = 8.85*10-12 c2/Nm2.
b) please elaborate in detail if this imaginary metal is transparent or not
c) calculate the skin depth for a frequency ω = 2*1013 rad/s
a) The plasma frequency is approximately [tex]1.7810^{16}[/tex] rad/s.
b) The imaginary metal is not transparent.
c) The skin depth is approximately [tex]6.3410^{-8}[/tex] m.
The plasma frequency is calculated using the given electronic density, charge of electrons, electron mass, and vacuum permittivity. The plasma frequency (ωp) can be calculated using the formula ωp = √([tex]Ne^{2}[/tex] / (me * ε0)). Plugging in the given values, we have Ne = [tex]4.210^{24}[/tex] atoms/[tex]m^{3}[/tex], e = [tex]1.610^{19}[/tex] C, me = [tex]9.110^{-31}[/tex] kg, and ε0 = 8.8510-12 [tex]C^{2}[/tex]/[tex]Nm^{2}[/tex]. Evaluating the expression, the plasma frequency is approximately 1.78*[tex]10^{16}[/tex] rad/s.
The presence of a non-zero imaginary part in the refractive index indicates that the metal is not transparent. To determine if the imaginary metal is transparent or not, we consider the imaginary part of the refractive index (2.3). Since the absorption coefficient is non-zero, the metal is not transparent.
The skin depth is determined by considering the angular frequency, conductivity, and permeability of free space. The skin depth (δ) can be calculated using the formula δ = √(2 / (ωμσ)), where ω is the angular frequency, μ is the permeability of free space, and σ is the conductivity of the metal.
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How many electrons does carbon have? how many are valence electrons? what third-row element has the same number of valence electrons as carbon?
Carbon has 6 electrons. To determine the number of valence electrons, we need to look at the electron configuration of carbon, which is 1s² 2s² 2p². The third-row element that has the same number of valence electrons as carbon is silicon (Si).
In the case of carbon, the first shell (1s) is fully filled with 2 electrons, and the second shell (2s and 2p) contains the remaining 4 electrons. The 2s subshell can hold a maximum of 2 electrons, and the 2p subshell can hold a maximum of 6 electrons, but in carbon's case, only 2 of the 2p orbitals are occupied. These 4 electrons in the outermost shell, specifically the 2s² and 2p² orbitals, are called valence electrons. The electron configuration describes the distribution of electrons in the different energy levels or shells of an atom.
Therefore, carbon has 4 valence electrons. Valence electrons are crucial in determining the chemical properties and reactivity of an element, as they are involved in the formation of chemical bonds.
The third-row element that has the same number of valence electrons as carbon is silicon (Si). Silicon also has 4 valence electrons, which can be seen in its electron configuration of 1s² 2s² 2p⁶ 3s² 3p². Carbon and silicon are in the same group (Group 14) of the periodic table and share similar chemical properties due to their comparable valence electron configurations.
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Carbon has 6 electrons in total, with 4 of them being valence electrons. Silicon is the third-row element that shares the same number of valence electrons as carbon.
Explanation:Carbon has 6 electrons in total. The electron configuration and orbital diagram for carbon are 1s²2s²2p¹, where the 1s and 2s orbitals are completely filled and the remaining two electrons occupy the 2p subshell. This means that carbon has 4 valence electrons.
The third-row element that has the same number of valence electrons as carbon is silicon (Si). Silicon also has 4 valence electrons.
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How much input force is required to extract an output force of 500 N from a simple machine that has a mechanical advantage of 8?
An input force of 62.5 N is required to extract an output force of 500 N from a simple machine that has a mechanical advantage of 8.
The mechanical advantage of a simple machine is defined as the ratio of the output force to the input force. Therefore, to find the input force required to extract an output force of 500 N from a simple machine with a mechanical advantage of 8, we can use the formula:
Mechanical Advantage (MA) = Output Force (OF) / Input Force (IF)
Rearranging the formula to solve for the input force, we get:
Input Force (IF) = Output Force (OF) / Mechanical Advantage (MA)
Substituting the given values, we have:
IF = 500 N / 8IF = 62.5 N
Therefore, an input force of 62.5 N is required to extract an output force of 500 N from a simple machine that has a mechanical advantage of 8. This means that the machine amplifies the input force by a factor of 8 to produce the output force.
This concept of mechanical advantage is important in understanding how simple machines work and how they can be used to make work easier.
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To extract an output force of 500 N from a simple machine that has a mechanical advantage of 8, the input force required is 62.5 N.
Mechanical advantage is defined as the ratio of output force to input force.
The formula for mechanical advantage is:
Mechanical Advantage (MA) = Output Force (OF) / Input Force (IF)
In order to determine the input force required, we can rearrange the formula as follows:
Input Force (IF) = Output Force (OF) / Mechanical Advantage (MA)
Now let's plug in the given values:
Output Force (OF) = 500 N
Mechanical Advantage (MA) = 8
Input Force (IF) = 500 N / 8IF = 62.5 N
Therefore, extract an output force of 500 N from a simple machine that has a mechanical advantage of 8, the input force required is 62.5 N.
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Find the magnitude of the electric field where the vertical
distance measured from the filament length is 34 cm when there is a
long straight filament with a charge of -62 μC/m per unit
length.
E=___
The magnitude of the electric field where the vertical distance measured from the filament length is 34 cm when there is a long straight filament with a charge of -62 μC/m per unit length is 2.22x10^5 N/C. Therefore, E= 2.22 x 10^5 N/C. A charged particle placed in an electric field experiences an electric force.
The magnitude of the electric field where the vertical distance measured from the filament length is 34 cm when there is a long straight filament with a charge of -62 μC/m per unit length is 2.22x10^5 N/C. Therefore, E= 2.22 x 10^5 N/C. A charged particle placed in an electric field experiences an electric force. The magnitude of the electric field is defined as the force per unit charge that acts on a positive test charge placed in that field. The electric field is represented by E.
The electric field is a vector quantity, and the direction of the electric field is the direction of the electric force acting on the test charge. The electric field is a function of distance from the charged object and the amount of charge present on the object. The electric field can be represented using field lines. The electric field lines start from the positive charge and end at the negative charge. The electric field due to a long straight filament with a charge of -62 μC/m per unit length is given by, E = (kλ)/r
where, k is Coulomb's constant = 9 x 109 N m2/C2λ is the charge per unit length
r is the distance from the filament
E = (9 x 109 N m2/C2) (-62 x 10-6 C/m) / 0.34 m = 2.22 x 105 N/C
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