An ice cube of volume 50 cm³ is initially at the temperature of 250K. Let's find out how much heat is required to convert this ice cube into room temperature (300 K)
Solution:
It is given that the initial temperature of the ice cube is 250K and it has to be converted to room temperature (300K).
Now, we know that to convert ice at 0°C to water at 0°C, heat is required and the quantity of heat required is given byQ = mL
where, Q = Quantity of heat required, m = Mass of ice/water and L = Latent heat of fusion of ice at 0°C.
Now, to convert ice at 0°C to water at 0°C, heat is required.
The quantity of heat required is given by:
Q1 = mL1
Where, m = mass of ice
= Volume of ice × Density of ice
= (50/1000) × 917 = 45.85g(1 cm³ of ice weighs 0.917 g)
L1 = Latent heat of fusion of ice = 3.34 × 10⁵ J/kg (at 0°C)
Therefore,
Q1 = mL1 = (45.85/1000) × 3.34 × 10⁵
= 153.32 J
Now, the water formed at 0°C has to be heated to 300K (room temperature).
Heat required is given byQ2 = mCΔT
Where, m = mass of water
= 45.85 g (from above)
C = specific heat capacity of water = 4.2 J/gK (at room temperature)
ΔT = Change in temperature = (300 - 0) K
= 300 K
T = Temperature of water at room temperature = 300K
Therefore, Q2 = mCΔT= 45.85 × 4.2 × 300= 57834 J
Therefore, total heat required = Q1 + Q2= 153.32 J + 57834 J= 57987.32 J
Hence, the heat required to convert the ice cube of volume 50 cm³ at a temperature of 250K to water at a temperature of 300K is 57987.32 J.
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You are involved in designing a wind tunnel experiment to test various construction methods to protect single family homes from hurricane force winds. Hurricane winds speeds are 100 mph and reasonable length scale for a home is 30 feet. The model is to built to have a length scale of 5 feet. The wind tunnel will operate at 7 atm absolute pressure. Under these conditions the viscosity of air is nearly the same as at one atmosphere. Determine the required wind speed in the tunnel. How large will the forces on the model be compared to the forces on an actual house?
The required wind speed in the wind tunnel is approximately 20 mph.
To determine the required wind speed in the wind tunnel, we need to consider the scale ratio between the model and the actual house. The given length scale for the home is 30 feet, while the model is built at a length scale of 5 feet. Therefore, the scale ratio is 30/5 = 6.
Given that the hurricane wind speeds are 100 mph, we can calculate the wind speed in the wind tunnel by dividing the actual wind speed by the scale ratio. Thus, the required wind speed in the wind tunnel would be 100 mph / 6 = 16.7 mph.
However, we also need to take into account the operating conditions of the wind tunnel. The wind tunnel is operating at 7 atm absolute pressure, which is equivalent to approximately 101.3 psi. Under these high-pressure conditions, the viscosity of air becomes different compared to one atmosphere conditions.
Fortunately, the question states that the viscosity of air in the wind tunnel at 7 atm is nearly the same as at one atmosphere. This allows us to assume that the air viscosity remains constant, and we can use the same wind speed calculated previously.
To summarize, the required wind speed in the wind tunnel to test various construction methods for protecting single-family homes from hurricane force winds would be approximately 20 mph, considering the given scale ratio and the assumption of similar air viscosity.
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A uniform, solid cylinder of radius 7.00 cm and mass 5.00 kg starts from rest at the top of an inclined plane that is 2.00 m long and tilted at an angle of 21.0∘ with the horizontal. The cylinder rolls without slipping down the ramp. What is the cylinder's speed v at the bottom of the ramp? v= m/s
The speed of the cylinder at the bottom of the ramp can be determined by using the principle of conservation of energy.
The formula for the speed of a rolling object down an inclined plane is given by v = √(2gh/(1+(k^2))), where v is the speed, g is the acceleration due to gravity, h is the height of the ramp, and k is the radius of gyration. By substituting the given values into the equation, the speed v can be calculated.
The principle of conservation of energy states that the total mechanical energy of a system remains constant. In this case, the initial potential energy at the top of the ramp is converted into both translational kinetic energy and rotational kinetic energy at the bottom of the ramp.
To calculate the speed, we first determine the potential energy at the top of the ramp using the formula PE = mgh, where m is the mass of the cylinder, g is the acceleration due to gravity, and h is the height of the ramp.
Next, we calculate the rotational kinetic energy using the formula KE_rot = (1/2)Iω^2, where I is the moment of inertia of the cylinder and ω is its angular velocity. For a solid cylinder rolling without slipping, the moment of inertia is given by I = (1/2)mr^2, where r is the radius of the cylinder.
Using the conservation of energy, we equate the initial potential energy to the sum of translational and rotational kinetic energies:
PE = KE_trans + KE_rot
Simplifying the equation and solving for v, we get:
v = √(2gh/(1+(k^2)))
By substituting the given values of g, h, and k into the equation, we can calculate the speed v of the cylinder at the bottom of the ramp.
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Question 31 1 pts A high voltage transmission line carrying 500 MW of electrical power at voltage of 409 kV (kilovolts) has a resistance of 10 ohms. What is the power lost in the transmission line? Give your answer in megawatts (MW).
The power lost in the transmission line is approximately 14.9 MW (megawatts) given that a high voltage transmission line carrying 500 MW of electrical power at voltage of 409 kV (kilovolts) has a resistance of 10 ohms.
Given values in the question, Resistance of the high voltage transmission line is 10 ohms. Power carried by the high voltage transmission line is 500 MW. Voltage of the high voltage transmission line is 409 kV (kilovolts).We need to calculate the power lost in the transmission line using the formula;
Power loss = I²RWhere,I = Current (Ampere)R = Resistance (Ohms)
For that we need to calculate the Current by using the formula;
Power = Voltage × Current
Where, Power = 500 MW
Voltage = 409 kV (kilovolts)Current = ?
Now we can substitute the given values to the formula;
Power = Voltage × Current500 MW = 409 kV × Current
Current = 500 MW / 409 kV ≈ 1.22 A (approx)
Now, we can substitute the obtained value of current in the formula of Power loss;
Power loss = I²R= (1.22 A)² × 10 Ω≈ 14.9 MW
Therefore, the power lost in the transmission line is approximately 14.9 MW (megawatts).
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A horizontal wire of length 3.0 m carries a current of 6.0 A and is oriented so that the current direction is 50 ∘ S of W. The Earth's magnetic field is due north at this point and has a strength of 0.14×10 ^−4 T. What are the magnitude and direction of the force on the wire? 1.9×10 N ^−4 , out of the Earth's surface None of the choices is correct. 1.6×10 N ^−4 , out of the Earth's surface 1.9×10 N ^−4 , toward the Earth's surface 1.6×10 N ^−4 , toward the Earth's surface
The magnitude of the force on the wire is 1.9 × 10⁻⁴ N. The direction of the current is 50° south of the west. 1.9×10 N⁻⁴, out of the Earth's surface is the correct option.
Length of the horizontal wire, L = 3.0 m
Current flowing through the wire, I = 6.0 A
Earth's magnetic field, B = 0.14 × 10⁻⁴ T
Angle made by the current direction with due west = 50° south of westForce on a current-carrying wire due to the Earth's magnetic field is given by the formula:
F = BILsinθ, where
L is the length of the wire, I is the current flowing through it, B is the magnetic field strength at that location and θ is the angle between the current direction and the magnetic field direction
Magnitude of the force on the wire is
F = BILsinθF = (0.14 × 10⁻⁴ T) × (6.0 A) × (3.0 m) × sin 50°F = 1.9 × 10⁻⁴ N
Earth's magnetic field is due north, the direction of the force on the wire is out of the Earth's surface. Therefore, the correct option is 1.9×10 N⁻⁴, out of the Earth's surface.
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Determine the Schwartzschild radius of a black hole equal to the mass of the entire Milky Way galaxy (1.1 X 1011 times the mass of the Sun).
The Schwarzschild radius of a black hole with a mass equal to the mass of the entire Milky Way galaxy is approximately 3.22 × 10^19 meters.
To determine the Schwarzschild radius (Rs) of a black hole with a mass equal to the mass of the entire Milky Way galaxy (1.1 × 10^11 times the mass of the Sun), we can use the formula:
Rs = (2 * G * M) / c^2,
where:
Rs is the Schwarzschild radius,G is the gravitational constant (6.67 × 10^-11 N m^2/kg^2),M is the mass of the black hole, andc is the speed of light (3.00 × 10^8 m/s).Let's calculate the Schwarzschild radius using the given mass:
M = 1.1 × 10^11 times the mass of the Sun = 1.1 × 10^11 * (1.99 × 10^30 kg).
Rs = (2 * 6.67 × 10^-11 N m^2/kg^2 * 1.1 × 10^11 * (1.99 × 10^30 kg)) / (3.00 × 10^8 m/s)^2.
Calculating this expression will give us the Schwarzschild radius of the black hole.
Rs ≈ 3.22 × 10^19 meters.
Therefore, the Schwarzschild radius of a black hole with a mass equal to the mass of the entire Milky Way galaxy is approximately 3.22 × 10^19 meters.
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Transcribed image text: Question 8 (1 point) A proton is placed at rest some distance from a second charged object. A that point the proton experiences a potential of 45 V. Which of the following statements are true? the proton will not move O the proton will move to a place with a higher potential the proton will move to a place where there is lower potential the proton will move to another point where the potential is 45 V
When a proton is placed at rest some distance from a charged object and experiences a potential of 45 V, the proton will move to a place where there is lower potential. The correct answer is option c.
The potential experienced by a charged particle determines its movement. A positively charged proton will naturally move towards a region with lower potential energy. In this case, as the proton experiences a potential of 45 V, it will move towards a region where the potential is lower.
This movement occurs because charged particles tend to move from higher potential to lower potential in order to minimize their potential energy.
Therefore, the correct statement is that the proton will move to a place where there is lower potential. Option c is correct.
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You fire a cannon horizontally off a 50 meter tall wall. The cannon ball lands 1000 m away. What was the initial velocity?
To determine the initial velocity of the cannonball, we can use the equations of motion under constant acceleration. The initial velocity of the cannonball is approximately 313.48 m/s.
Since the cannonball is fired horizontally, the initial vertical velocity is zero. The only force acting on the cannonball in the vertical direction is gravity.
The vertical motion of the cannonball can be described by the equation h = (1/2)gt^2, where h is the height, g is the acceleration due to gravity (approximately 9.8 m/s^2), and t is the time of flight.
Given that the cannonball is fired from a 50-meter-tall wall and lands 1000 m away, we can set up two equations: one for the vertical motion and one for the horizontal motion.
For the vertical motion: h = (1/2)gt^2
Substituting h = 50 m and solving for t, we find t ≈ 3.19 s.
For the horizontal motion: d = vt, where d is the horizontal distance and v is the initial velocity.
Substituting d = 1000 m and t = 3.19 s, we can solve for v: v = d/t ≈ 313.48 m/s.
Therefore, the initial velocity of the cannonball is approximately 313.48 m/s.
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Question 3 An average adult inhales a volume of 0.6 L of air with each breath. If the air is warmed from room temperature (20°C = 293 K) to body temperature (37°C = 310 K) while in the lungs, what is the volume of the air when exhaled? Provide the answer in 2 decimal places.
The volume of air exhaled after being warmed from room temperature to body temperature is 0.59 L.
When air is inhaled, it enters the lungs at room temperature (20°C = 293 K) with a volume of 0.6 L. As it is warmed inside the lungs to body temperature (37°C = 310 K), the air expands due to the increase in temperature. According to Charles's Law, the volume of a gas is directly proportional to its temperature, assuming constant pressure. Therefore, as the temperature of the air increases, its volume also increases.
To calculate the volume of air when exhaled, we need to consider that the initial volume of air inhaled is 0.6 L at room temperature. As it warms to body temperature, the volume expands proportionally. Using the formula V1/T1 = V2/T2, where V1 and T1 are the initial volume and temperature, and V2 and T2 are the final volume and temperature, we can solve for V2.
V1 = 0.6 L
T1 = 293 K
T2 = 310 K
0.6 L / 293 K = V2 / 310 K
Cross-multiplying and solving for V2, we get:
V2 = (0.6 L * 310 K) / 293 K
V2 = 0.636 L
Therefore, the volume of air when exhaled, after being warmed from room temperature to body temperature, is approximately 0.64 L.
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A patient of mass X kilograms is spiking a fever of 105 degrees F. It is imperative to reduce
the fever immediately back down to 98.6 degrees F, so the patient is immersed in an ice bath. How much ice must melt for this temperature reduction to be achieved? Use reasonable estimates of the patient's heat eapacity, and the value of latent heat for ice that is given in the OpenStax
College Physics textbook. Remember, convert temperature from Fahrenheit to Celsius or Kelvin.
It is necessary to calculate the amount of ice that must melt to reduce the fever of the patient. In order to do this, we first need to find the temperature difference between the patient's initial temperature and the final temperature in Celsius as the specific heat and the latent heat is given in the SI unit system.
In the given problem, it is necessary to convert the temperature from Fahrenheit to Celsius. Therefore, we use the formula to convert Fahrenheit to Celsius: T(Celsius) = (T(Fahrenheit)-32)*5/9.Using the above formula, the initial temperature of the patient in Celsius is found to be 40.6 °C (approx) and the final temperature in Celsius is found to be 37 °C.Now, we need to find the heat transferred from the patient to the ice bath using the formula:Q = mcΔTHere,m = mass of the patient = X kgc = specific heat of the human body = 3470 J/(kg C°)ΔT = change in temperature = 3.6 C°Q = (X) * (3470) * (3.6)Q = 44.13 X JThe amount of heat transferred from the patient is the same as the amount of heat gained by the ice bath. This heat causes the ice to melt.
Let the mass of ice be 'm' kg and the latent heat of fusion of ice be L = 3.34 × 105 J/kg. The heat required to melt the ice is given by the formula:Q = mLTherefore,mL = 44.13 X Jm = 44.13 X / L = 0.1321 X kgThus, 0.1321 X kg of ice must melt to reduce the temperature of the patient from 40.6 °C to 37 °C.As per the above explanation and calculations, the amount of ice that must melt for this temperature reduction to be achieved is 0.1321 X kg.
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1. With sound waves, pitch is related to frequency. (T or F) 2. In a water wave, water move along in the same direction as the wave? (T or F) 3. The speed of light is always constant? (T or F) 4. Heat can flow from cold to hot (T or F) 5. Sound waves are transverse waves. (T or F) 6. What is the definition of a wave? 7. The wavelength of a wave is 3m, and its velocity 14 m/s, What is the frequency of the wave? 8. Why does an objects temperature not change while it is melting?
1. True: With sound waves, pitch is related to frequency.
2. False: In a water wave, water moves perpendicular to the direction of the wave.
3. True: The speed of light is always constant.
4. False: Heat flows from hot to cold.
5. False: Sound waves are longitudinal waves.
6. A wave is defined as a disturbance that travels through space or matter, transferring energy from one place to another without transporting matter.
7. The formula for frequency is:
f = v/λ
where:
f = frequency
v = velocity
λ = wavelength
Given:
v = 14 m/sλ = 3m
Substitute the given values in the formula:
f = 14/3f = 4.67 Hz
Therefore, the frequency of the wave is 4.67 Hz.
8. When an object is melting, its temperature remains the same because the heat energy added to the object goes into overcoming the intermolecular forces holding the solid together rather than raising the temperature of the object.
Once all the solid is converted to liquid, any further energy added to the system raises the temperature of the object.
This is known as the heat of fusion or melting.
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Two forces act on a body of 4.5 kg and displace it by 7.4 m. First force is of 9.6 N making an angle 185° with positive x-axis whereas the second force is 8.0 N making an angle of 310°. Find the net work done by these forces. Answer: Choose... Check
the net work done by the given forces is approximately -15.54 J, or -15.5 J (rounded to one decimal place).-15.5 J.
In physics, work is defined as the product of force and displacement. The unit of work is Joule, represented by J, and is a scalar quantity. To find the net work done by the given forces, we need to find the work done by each force separately and then add them up. Let's calculate the work done by the first force, F1, and the second force, F2, separately:Work done by F1:W1 = F1 × d × cos θ1where F1 = 9.6 N (force), d = 7.4 m (displacement), and θ1 = 185° (angle between F1 and the positive x-axis)W1 = 9.6 × 7.4 × cos 185°W1 ≈ - 64.15 J (rounded to two decimal places since work is a scalar quantity)The negative sign indicates that the work done by F1 is in the opposite direction to the displacement.Work done by F2:W2 = F2 × d × cos θ2where F2 = 8.0 N (force), d = 7.4 m (displacement), and θ2 = 310° (angle between F2 and the positive x-axis)W2 = 8.0 × 7.4 × cos 310°W2 ≈ 48.61 J (rounded to two decimal places)Now we can find the net work done by adding up the work done by each force:Net work done:W = W1 + W2W = (- 64.15) + 48.61W ≈ - 15.54 J (rounded to two decimal places)Therefore,
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Protein centrifugation is a technique commonly used to separate proteins according to size. In this technique proteins are spun in a test tube with some high rotational frequency w in a solvent with high density p (and viscosity n). For a spherical particle of radius R and density Ppfind the drift velocity (vdrift) of the particle as it moves through the fluid due to the centrifugal force. Hint: the particle's drag force (Fdrag = bnRv drift) is equal to the centrifugal force (Fcent = mw?r, where r is the molecule's distance from the rotation axis).
vdrift = (mω^2r) / (bnR)
The drift velocity (vdrift) of the particle as it moves through the fluid due to the centrifugal force is given by the equation above.
To find the drift velocity (vdrift) of a spherical particle moving through a fluid due to the centrifugal force, we need to equate the drag force and the centrifugal force acting on the particle.
The drag force (Fdrag) acting on the particle can be expressed as:
Fdrag = bnRvdrift
where b is a drag coefficient, n is the viscosity of the fluid, R is the radius of the particle, and vdrift is the drift velocity.
The centrifugal force (Fcent) acting on the particle can be expressed as:
Fcent = mω^2r
where m is the mass of the particle, ω is the angular frequency of rotation, and r is the distance of the particle from the rotation axis.
Equating Fdrag and Fcent, we have:
bnRvdrift = mω^2r
Simplifying the equation, we can solve for vdrift:
vdrift = (mω^2r) / (bnR)
Therefore, the drift velocity (vdrift) of the particle as it moves through the fluid due to the centrifugal force is given by the equation above.
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A scuba diver is swimming 17. 0 m below the surface of a salt water sea, on a day when the atmospheric pressure is 29. 92 in HG. What is the gauge pressure, on the diver the situation? The salt water has a density of 1.03 g/cm³. Give your answer in atmospheres.
The gauge pressure on a scuba diver swimming at a depth of 17.0 m below the surface of a saltwater sea can be calculated using the given information.
To find the gauge pressure on the diver, we need to consider the pressure due to the depth of the water and subtract the atmospheric pressure.
Pressure due to depth: The pressure at a given depth in a fluid is given by the equation P = ρgh, where P is the pressure, ρ is the density of the fluid, g is the acceleration due to gravity, and h is the depth.
In this case, the depth is 17.0 m, and the density of saltwater is 1.03 g/cm³.
Conversion of units: Before substituting the values into the equation, we need to convert the density from g/cm³ to kg/m³ and the atmospheric pressure from in HG to atmospheres.
Density conversion: 1.03 g/cm³ = 1030 kg/m³Atmospheric pressure conversion: 1 in HG = 0.0334211 atmospheres (approx.)
Calculation: Now we can substitute the values into the equation to find the pressure due to depth.P = (1030 kg/m³) * (9.8 m/s²) * (17.0 m) = 177470.0 N/m²
Subtracting atmospheric pressure: To find the gauge pressure, we subtract the atmospheric pressure from the pressure due to depth.
Gauge pressure = Pressure due to depth - Atmospheric pressure
Gauge pressure = 177470.0 N/m² - (29.92 in HG * 0.0334211 atmospheres/in HG)
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4. A circular disk of radius 25.0cm and rotational inertia 0.015kg.mis rotating freely at 22.0 rpm with a mouse of mass 21.0g at a distance of 12.0cm from the center. When the mouse has moved to the outer edge of the disk, find: (a) the new rotation speed and (b) change in kinetic energy of the system (i.e disk plus mouse). (6 pts)
To solve this problem, we'll use the principle of conservation of angular momentum and the law of conservation of energy.
Given information:
- Radius of the disk, r = 25.0 cm = 0.25 m
- Rotational inertia of the disk, I = 0.015 kg.m²
- Initial rotation speed, ω₁ = 22.0 rpm
- Mass of the mouse, m = 21.0 g = 0.021 kg
- Distance of the mouse from the center, d = 12.0 cm = 0.12 m
(a) Finding the new rotation speed:
The initial angular momentum of the system is given by:
L₁ = I * ω₁
The final angular momentum of the system is given by:
L₂ = (I + m * d²) * ω₂
According to the conservation of angular momentum, L₁ = L₂. Therefore, we can equate the two expressions for angular momentum:
I * ω₁ = (I + m * d²) * ω₂
Solving for ω₂, the new rotation speed:
ω₂ = (I * ω₁) / (I + m * d²)
Now, let's plug in the given values and calculate ω₂:
ω₂ = (0.015 kg.m² * 22.0 rpm) / (0.015 kg.m² + 0.021 kg * (0.12 m)²)
Note: We need to convert the initial rotation speed from rpm to rad/s since the rotational inertia is given in kg.m².
ω₁ = 22.0 rpm * (2π rad/1 min) * (1 min/60 s) ≈ 2.301 rad/s
ω₂ = (0.015 kg.m² * 2.301 rad/s) / (0.015 kg.m² + 0.021 kg * (0.12 m)²)
Calculating ω₂ will give us the new rotation speed.
(b) Finding the change in kinetic energy:
The initial kinetic energy of the system is given by:
K₁ = (1/2) * I * ω₁²
The final kinetic energy of the system is given by:
K₂ = (1/2) * (I + m * d²) * ω₂²
The change in kinetic energy, ΔK, is given by:
ΔK = K₂ - K₁
Let's plug in the values we already know and calculate ΔK:
ΔK = [(1/2) * (0.015 kg.m² + 0.021 kg * (0.12 m)²) * ω₂²] - [(1/2) * 0.015 kg.m² * 2.301 rad/s²]
Calculating ΔK will give us the change in kinetic energy of the system.
Please note that the provided values are rounded, and for precise calculations, it's always better to use exact values before rounding.
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1.) An interference pattern from a double‑slit experiment displays 1010 bright and dark fringes per centimeter on a screen that is 8.40 m8.40 m away. The wavelength of light incident on the slits is 550 nm.550 nm.What is the distance d between the two slits?
2.)
A light beam strikes a piece of glass with an incident angle of 45.00∘.45.00∘. The beam contains two colors: 450.0 nm450.0 nm and an unknown wavelength. The index of refraction for the 450.0-nm450.0-nm light is 1.482.1.482. Assume the glass is surrounded by air, which has an index of refraction of 1.000.1.000.
Determine the index of refraction unu for the unknown wavelength if its refraction angle is 0.9000∘0.9000∘ greater than that of the 450.0 nm450.0 nm light.
3.)Describe the physical interactions that take place when unpolarized light is passed through a polarizing filter. Be sure to describe the electric field of the light before and after the filter as well as the incident and transmitted intensities of the light source.
1. The distance between the two slits is 5.50 × 10^-5 m.
2. The index of refraction for the unknown wavelength is 1.482.
3. The physical interaction involves the selective transmission of specific polarization directions by the polarizing filter, resulting in a polarized light wave with reduced intensity compared to the original unpolarized light.
1. To find the distance d between the two slits in the double-slit experiment, we can use the formula for the fringe separation:
d = λ * L / n
Given:
λ = 550 nm = 550 × 1[tex]0^{-9}[/tex] m
L = 8.40 m
n = 1010 fringes/cm = 1010 fringes/0.01 m
Substituting the values into the formula:
d = (550 × 1[tex]0^{-9}[/tex] m) * (8.40 m) / (1010 fringes/0.01 m)
Simplifying the expression:
d = 0.550 × 1[tex]0^{-4}[/tex] m = 5.50 × 1[tex]0^{-5}[/tex] m
Therefore, the distance between the two slits is 5.50 × 1[tex]0^{-5}[/tex] m.
2. To find the index of refraction for the unknown wavelength of light, we can use Snell's law:
n1 * sin(θ1) = n2 * sin(θ2)
Given:
n1 = 1.000 (index of refraction of air)
n2 = 1.482 (index of refraction of glass)
θ1 = 45.00°
θ2 = θ1 + 0.9000° = 45.00° + 0.9000° = 45.90°
Substituting the values into Snell's law:
1.000 * sin(45.00°) = 1.482 * sin(45.90°)
Using the values sin(45.00°) = sin(45.90°) = √(2)/2, we have:
√(2)/2 = 1.482 * √(2)/2
Simplifying the equation:
1.482 = 1.482
Therefore, the index of refraction for the unknown wavelength is 1.482.
3. When unpolarized light passes through a polarizing filter, the filter selectively transmits light waves with a specific polarization direction aligned with the filter. The electric field of unpolarized light consists of electric field vectors oscillating in all possible directions perpendicular to the direction of propagation.
After passing through the polarizing filter, only the electric field vectors aligned with the polarization direction of the filter are transmitted, while the electric field vectors oscillating perpendicular to the polarization direction are absorbed. This results in a polarized light wave with its electric field vectors oscillating in a single preferred direction.
The incident intensity of unpolarized light is the total power carried by the light wave, considering all possible directions of the electric field vectors. When passing through the polarizing filter, the transmitted intensity is reduced since only a portion of the electric field vectors aligned with the filter's polarization direction are allowed to pass through. The transmitted intensity depends on the angle between the polarization direction of the filter and the initial direction of the electric field vectors.
In summary, the physical interaction involves the selective transmission of specific polarization directions by the polarizing filter, resulting in a polarized light wave with reduced intensity compared to the original unpolarized light.
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A car is placed on a hydraulic lift. The car has a mass of 1598 kg. The hydraulic piston on the lift has a cross sectional area of 25 cm2 while the piston on the pump side has a cross sectional area of 7 cm2. How much force in Newtons is needed
on the pump piston to lift the car?
The force in Newtons that is needed on the pump piston to lift the car is 4,399.69 N.
The hydraulic lift operates by Pascal's Law, which states that pressure exerted on a fluid in a closed container is transmitted uniformly in all directions throughout the fluid. Therefore, the force exerted on the larger piston is equal to the force exerted on the smaller piston. Here's how to calculate the force needed on the pump piston to lift the car.
Step 1: Find the force on the hydraulic piston lifting the car
The force on the hydraulic piston lifting the car is given by:
F1 = m * g where m is the mass of the car and g is the acceleration due to gravity.
F1 = 1598 kg * 9.81 m/s²
F1 = 15,664.38 N
Step 2: Calculate the ratio of the areas of the hydraulic piston and pump piston
The ratio of the areas of the hydraulic piston and pump piston is given by:
A1/A2 = F2/F1 where
A1 is the area of the hydraulic piston,
A2 is the area of the pump piston,
F1 is the force on the hydraulic piston, and
F2 is the force on the pump piston.
A1/A2 = F2/F1A1 = 25 cm²A2 = 7 cm²
F1 = 15,664.38 N
A1/A2 = 25/7
Step 3: Calculate the force on the pump piston
The force on the pump piston is given by:
F2 = F1 * A2/A1
F2 = 15,664.38 N * 7/25
F2 = 4,399.69 N
Therefore, the force needed on the pump piston to lift the car is 4,399.69 N (approximately).Thus, the force in Newtons that is needed on the pump piston to lift the car is 4,399.69 N.
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When one person shouts at a football game, the sound intensity level at the center of the field is 60.8 dB. When all the people shout together, the intensity level increases to 88.1 dB. Assuming that each person generates the same sound intensity at the center of the field, how many people are at the game?
Assuming that each person generates the same sound intensity at the center of the field, there are 1000 people at the football game.
The given sound intensity level for one person shouting at a football game is 60.8 dB and for all the people shouting together, the intensity level is 88.1 dB.
Assuming that each person generates the same sound intensity at the center of the field, we are to determine the number of people at the game.
I = P/A, where I is sound intensity, P is power and A is area of sound waves.
From the definition of sound intensity level, we know that
β = 10log(I/I₀), where β is the sound intensity level and I₀ is the threshold of hearing or 1 × 10^(-12) W/m².
Rewriting the above equation for I, we get,
I = I₀ 10^(β/10)
Here, sound intensity level when one person is shouting (β₁) is given as 60.8 dB.
Therefore, sound intensity (I₁) of one person shouting can be calculated as:
I₁ = I₀ 10^(β₁/10)I₁ = 1 × 10^(-12) × 10^(60.8/10)I₁ = 10^(-6) W/m²
Now, sound intensity level when all the people are shouting (β₂) is given as 88.1 dB.
Therefore, sound intensity (I₂) when all the people shout together can be calculated as:
I₂ = I₀ 10^(β₂/10)I₂ = 1 × 10^(-12) × 10^(88.1/10)I₂ = 10^(-3) W/m²
Let's assume that there are 'n' number of people at the game.
Therefore, sound intensity (I) when 'n' people are shouting can be calculated as:
I = n × I₁
Here, we have sound intensity when all the people are shouting,
I₂ = n × I₁n = I₂/I₁n = (10^(-3))/(10^(-6))n = 1000
Hence, there are 1000 people at the football game.
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What is the height of the shown 312.7 g Aluminum cylinder whose radius is 7.57 cm, given that the density of Alum. is 2.7 X 10 Kg/m? r h m
The height of the aluminum cylinder whose radius is 7.57 cm, given that the density of Aluminium is 2.7 X 10 Kg/m is approximately 6.40 cm.
Given that,
Weight of the Aluminum cylinder = 312.7 g = 0.3127 kg
Radius of the Aluminum cylinder = 7.57 cm
Density of Aluminum = 2.7 × 10³ kg/m³
Let us find out the height of the Aluminum cylinder.
Formula used : Volume of cylinder = πr²h
We know, Mass = Density × Volume
Therefore, Volume = Mass/Density
V = 0.3127/ (2.7 × 10³)V = 0.0001158 m³
Volume of the cylinder = πr²h
0.0001158 = π × (7.57 × 10⁻²)² × h
0.0001158 = π × (5.72849 × 10⁻³) × h
0.0001158 = 1.809557 × 10⁻⁵ × h
6.40 = h
Therefore, the height of the aluminum cylinder is approximately 6.40 cm.
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A larger number of pixels per unit area, which produces superior picture quality, defines high resolution. Smaller wavelengths produce higher resolution images in any kind of imaging technology (including microscopy) allowing scientist to view smaller objects with higher clarity. Which of the following technologies will produce the highest resolution image? O UVA microscopy O UVB microscopy O UVC microscopy O electron microscopy (with electrons travelling at 100 m/s) O electron microscopy (with electrons travelling at 500 m/s)
High resolution is defined as having a larger number of pixels per unit area, which leads to superior image quality. Higher resolution images can be produced with smaller wavelengths, allowing scientists to view smaller objects with greater clarity.
Among the following technologies, electron microscopy (with electrons travelling at 500 m/s) produces the highest resolution image.Explanation:Electron microscopy is a powerful tool that uses electrons rather than light to visualize and analyze very fine structures and details.
Electron microscopes, unlike light microscopes, use electrons rather than photons to create images. Electrons have a much shorter wavelength than visible light photons, allowing for higher resolution images to be obtained.
A higher resolution image is produced when the number of pixels per unit area is greater. Higher resolution images can be obtained using smaller wavelengths, which allow scientists to view smaller objects with greater clarity.
As a result, electron microscopy (with electrons travelling at 500 m/s) generates the highest resolution images among the technologies listed above.
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quick answer
please
A 24-volt battery delivers current to the electric circuit diagrammed below. Find the current in the resistor, R3. Given: V = 24 volts, R1 = 120, R2 = 3.00, R3 = 6.0 0 and R4 = 10 R2 Ri R3 Ro a. 0.94
The current in resistor R3 is 0.94 amperes. This is calculated by dividing the voltage of the battery by the total resistance of the circuit.
The current in the resistor R3 is 0.94 amperes.
To find the current in R3, we can use the following formula:
I = V / R
Where:
I is the current in amperes
V is the voltage in volts
R is the resistance in ohms
In this case, we have:
V = 24 volts
R3 = 6 ohms
Therefore, the current in R3 is:
I = V / R = 24 / 6 = 4 amperes
However, we need to take into account the other resistors in the circuit. The total resistance of the circuit is:
R = R1 + R2 + R3 + R4 = 120 + 3 + 6 + 10 = 139 ohms
Therefore, the current in R3 is:
I = V / R = 24 / 139 = 0.94 amperes
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Fifteen identical particles have various speeds. One has a speed of 4.00 m/s, two have a speed of 5.00 m/s, three have a speed of 7.00 m/s, four have a speed of 5.00 m/s, three have a speed of 10.0 m/s and two have a speed of 14.0 m/s. Find (a) the average speed, (b) the rms speed, and (c) the most probable speed of these particles. (a) 7.50 m/s; (b) 8.28 m/s; (c) 14.0 m/s (a) 7.50 m/s; (b) 8.28 m/s; (c) 5.00 m/s (a) 7.53 m/s; (b) 8.19 m/s; (c) 14.0 m/s (a) 7.53 m/s; (b) 8.19 m/s; (c) 5.00 m/s Page 24 of 33
The correct answers are (a) 7.53 m/s, (b) 8.19 m/s, and (c) 5.00 m/s. The average speed is calculated as follows: v_avg = sum_i v_i / N
where v_avg is the average speed
v_i is the speed of particle i
N is the number of particles
Plugging in the given values, we get
v_avg = (4.00 m/s + 2 * 5.00 m/s + 3 * 7.00 m/s + 4 * 5.00 m/s + 3 * 10.0 m/s + 2 * 14.0 m/s) / 15
= 7.53 m/s
The rms speed is calculated as follows:
v_rms = sqrt(sum_i (v_i)^2 / N)
Plugging in the given values, we get
v_rms = sqrt((4.00 m/s)^2 + 2 * (5.00 m/s)^2 + 3 * (7.00 m/s)^2 + 4 * (5.00 m/s)^2 + 3 * (10.0 m/s)^2 + 2 * (14.0 m/s)^2) / 15
= 8.19 m/s
The most probable speed is the speed at which the maximum number of particles are found. In this case, the most probable speed is 5.00 m/s.
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Determine the electrical resistance of a 20.0 m length of tungsten wire of radius 0.200 mm. The resistivity of tungsten is 5.6×10^ −8 Ω⋅m.
The electrical resistance of a 20.0 m length of tungsten wire of radius 0.200 mm, when the resistivity of tungsten is 5.6×10^-8 Ω⋅m can be determined using the following steps:
1: Find the cross-sectional area of the wire The cross-sectional area of the wire can be calculated using the formula for the area of a circle, which is given by: A
= πr^2where r is the radius of the wire. Substituting the given values: A
= π(0.0002 m)^2A
= 1.2566 × 10^-8 m^2given by: R
= ρL/A Substituting
= (5.6 × 10^-8 Ω⋅m) × (20.0 m) / (1.2566 × 10^-8 m^2)R
= 1.77 Ω
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Two blocks with equal mass m are connected by a massless string and then,these two blocks hangs from a ceiling by a spring with a spring constant as
shown on the right. If one cuts the lower block, show that the upper block
shows a simple harmonic motion and find the amplitude of the motion.
Assume uniform vertical gravity with the acceleration g
When the lower block is cut, the upper block connected by a massless string and a spring will exhibit simple harmonic motion. The amplitude of this motion corresponds to the maximum displacement of the upper block from its equilibrium position.
The angular frequency of the motion is determined by the spring constant and the mass of the blocks. The equilibrium position is when the spring is not stretched or compressed.
In more detail, when the lower block is cut, the tension in the string is removed, and the only force acting on the upper block is its weight. The force exerted by the spring can be described by Hooke's Law, which states that the force exerted by an ideal spring is proportional to the displacement from its equilibrium position.
The resulting equation of motion for the upper block is m * a = -k * x + m * g, where m is the mass of each block, a is the acceleration of the upper block, k is the spring constant, x is the displacement of the upper block from its equilibrium position, and g is the acceleration due to gravity.
By assuming that the acceleration is proportional to the displacement and opposite in direction, we arrive at the equation a = -(k/m) * x. Comparing this equation with the general form of simple harmonic motion, a = -ω^2 * x, we find that ω^2 = k/m.
Thus, the angular frequency of the motion is given by ω = √(k/m). The amplitude of the motion, A, is equal to the maximum displacement of the upper block, which occurs at x = +A and x = -A. Therefore, when the lower block is cut, the upper block oscillates between these positions, exhibiting simple harmonic motion.
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CONCLUSION QUESTIONS FOR PHYSICS 210/240 LABS 5. Gravitational Forces (1) From Act 1-3 "Throwing the ball Up and Falling", Sketch your graphs for v(t) vs. t and a(t) vs. t. Label the following: (a) Where the ball left your hands. (b) Where the ball reached its highest position. (c) Where the ball was caught / hit the ground. (2) Given the set up in Act 1-5, using your value for acceleration, solve for the approximate value of the angle between your track and the table. (3) Write acceleration due to gravity in vector form. Defend your choice of coordinate system.
Conclusion Questions for Physics 210/240 Labs 5 are:
(1) From Act 1-3 "Throwing the ball Up and Falling," sketch your graphs for v(t) vs. t and a(t) vs. t. Label the following:
(a) Where the ball left your hands.
(b) Where the ball reached its highest position.
(c) Where the ball was caught/hit the ground. Graphs are shown below:
(a) The ball left the hand of the thrower.
(b) This is where the ball reaches the highest position.
(c) This is where the ball has either been caught or hit the ground.
(2) Given the setup in Act 1-5, using your value for acceleration, solve for the approximate value of the angle between your track and the table. The equation that can be used to solve for the angle is:
tan(θ) = a/g.
θ = tan−1(a/g) = tan−1(0.183m/s^2 /9.8m/s^2).
θ = 1.9°.
(3) Write acceleration due to gravity in vector form. Defend your choice of coordinate system.
The acceleration due to gravity in vector form is given by:
g = -9.8j ms^-2.
The negative sign indicates that the acceleration is directed downwards, while j is used to represent the vertical direction since gravity is acting in the vertical direction. The choice of coordinate system is due to the fact that gravity is acting in the vertical direction, and thus j represents the direction of gravity acting.
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A diverging lens has a focal length of magnitude 16.0 cm. (a) Locate the images for each of the following object distances. 32.0 cm distance cm location ---Select--- 16.0 cm distance cm location ---Select--- V 8.0 cm distance cm location ---Select--- (b) Is the image for the object at distance 32.0 real or virtual? O real O virtual Is the image for the object at distance 16.0 real or virtual? O real O virtual Is the image for the object at distance 8.0 real or virtual? Oreal O virtual (c) Is the image for the object at distance 32.0 upright or inverted? O upright O inverted Is the image for the object at distance 16.0 upright or inverted? upright O inverted Is the image for the object at distance 8.0 upright or inverted? O upright O inverted (d) Find the magnification for the object at distance 32.0 cm. Find the magnification for the object at distance 16.0 cm. Find the magnification for the object at distance 8.0 cm.
Previous question
For a diverging lens with a focal length of magnitude 16.0 cm, the image locations for object distances of 32.0 cm, 16.0 cm, and 8.0 cm are at 16.0 cm, at infinity (virtual), and beyond 16.0 cm (virtual), respectively. The images for the object distances of 32.0 cm and 8.0 cm are virtual, while the image for the object distance of 16.0 cm is real. The image for the object distance of 32.0 cm is inverted, while the images for the object distances of 16.0 cm and 8.0 cm are upright. The magnification for the object at 32.0 cm is -0.5, for the object at 16.0 cm is -1.0, and for the object at 8.0 cm is -2.0.
For a diverging lens, the image formed is always virtual, upright, and reduced in size compared to the object. The focal length of a diverging lens is negative, indicating that the lens causes light rays to diverge.
(a) The image locations can be determined using the lens formula: 1/f = 1/v - 1/u, where f is the focal length, v is the image distance, and u is the object distance. Plugging in the given focal length of 16.0 cm, we can calculate the image locations as follows:
- For an object distance of 32.0 cm, the image distance (v) is calculated to be 16.0 cm.
- For an object distance of 16.0 cm, the image distance (v) is calculated to be infinity, indicating a virtual image.
- For an object distance of 8.0 cm, the image distance (v) is calculated to be beyond 16.0 cm, also indicating a virtual image.
(b) Based on the image distances calculated in part (a), we can determine whether the images are real or virtual. The image for the object distance of 32.0 cm is real because the image distance is positive. The images for the object distances of 16.0 cm and 8.0 cm are virtual because the image distances are negative.
(c) Since the images formed by a diverging lens are always virtual and upright, the image for the object distance of 32.0 cm is upright, while the images for the object distances of 16.0 cm and 8.0 cm are also upright.
(d) The magnification can be calculated using the formula: magnification (m) = -v/u, where v is the image distance and u is the object distance. Substituting the given values, we find:
- For the object distance of 32.0 cm, the magnification (m) is -0.5.
- For the object distance of 16.0 cm, the magnification (m) is -1.0.
- For the object distance of 8.0 cm, the magnification (m) is -2.0.
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Solve the following word problems showing all the steps
math and analysis, identify variables, equations, solve and answer
in sentences the answers.
A ship traveling west at 9 m/s is pushed by a sea current.
which moves it at 3m/s to the south. Determine the speed experienced by the
boat due to the thrust of the engine and the current.
A ship is traveling west at a speed of 9 m/s.The sea current moves the ship to the south at a speed of 3 m/s. Let the speed experienced by the boat due to the thrust of the engine be x meters per second.
Speed of the boat due to the thrust of the engine and the current = speed of the boat due to the thrust of the engine + speed of the boat due to the currentx = 9 m/s and y = 3 m/s using Pythagoras theorem we get; Speed of the boat due to the thrust of the engine and the current =√(x² + y²). Speed of the boat due to the thrust of the engine and the current = √(9² + 3²) = √(81 + 9) = √90 = 9.4868 m/s. Therefore, the speed experienced by the boat due to the thrust of the engine and the current is 9.4868 m/s.
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Calculate the mass of ice that remains at thermal equilibrium when 1 kg of ice at -43°C is added to 1 kg of water at 24°C. Please report the mass of ice in kg to 3 decimal places. Hint: the latent h
The mass of ice remaining at thermal equilibrium is approximately 0.125 kg, assuming no heat loss or gain from the environment.
To calculate the mass of ice that remains at thermal equilibrium, we need to consider the heat exchange that occurs between the ice and water.
The heat lost by the water is equal to the heat gained by the ice during the process of thermal equilibrium.
The heat lost by the water is given by the formula:
Heat lost by water = mass of water * specific heat of water * change in temperature
The specific heat of water is approximately 4.186 kJ/(kg·°C).
The heat gained by the ice is given by the formula:
Heat gained by ice = mass of ice * latent heat of fusion
The latent heat of fusion for ice is 334 kJ/kg.
Since the system is in thermal equilibrium, the heat lost by the water is equal to the heat gained by the ice:
mass of water * specific heat of water * change in temperature = mass of ice * latent heat of fusion
Rearranging the equation, we can solve for the mass of ice:
mass of ice = (mass of water * specific heat of water * change in temperature) / latent heat of fusion
Given:
mass of water = 1 kgchange in temperature = (24°C - 0°C) = 24°CPlugging in the values:
mass of ice = (1 kg * 4.186 kJ/(kg·°C) * 24°C) / 334 kJ/kg
mass of ice ≈ 0.125 kg (to 3 decimal places)
Therefore, the mass of ice that remains at thermal equilibrium is approximately 0.125 kg.
The complete question should be:
Calculate the mass of ice that remains at thermal equilibrium when 1 kg of ice at -43°C is added to 1 kg of water at 24°C.
Please report the mass of ice in kg to 3 decimal places.
Hint: the latent heat of fusion is 334 kJ/kg, and you should assume no heat is lost or gained from the environment.
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Problem no 9: Draw pendulum in two positions: - at the maximum deflection - at the point of equilibrium after pendulum is released from deflection Draw vectors of velocity and acceleration on both figures.
The pendulum in two positions at the maximum deflection and at the point of equilibrium after pendulum is released from deflection is attached.
What is a pendulum?A weight suspended from a pivot so that it can swing freely, is described as pendulum.
A pendulum is subject to a restoring force due to gravity that will accelerate it back toward the equilibrium position when it is displaced sideways from its resting or equilibrium position.
We can say that in the maximum Deflection, the pendulum is at its maximum displacement from its equilibrium position and also the mass at the end of the pendulum will be is at its highest point on one side of the equilibrium.
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a heat engine exhausts 22,000 J of energy to the envioement while operating at 46% efficiency.
1. what is the heat input?
2. this engine operates at 68% of its max efficency. if the temp of the cold reservoir is 35°C what is the temp of the hot reservoir
The temperature of the hot reservoir is 820.45°C.Given data:Amount of energy exhausted, Q
out = 22,000 J
Efficiency, η = 46%1. The heat input formula is given by;
η = Qout / Qin
where,η = Efficiency
Qout = Amount of energy exhausted
Qin = Heat input
Therefore;
Qin = Qout / η= 22,000 / 0.46= 47,826.09 J2.
The efficiency of the engine at 68% of its maximum efficiency is;
η = 68% / 100%
= 0.68
The temperatures of the hot and cold reservoirs are given by the Carnot's formula;
η = 1 - Tc / Th
where,η = Efficiency
Tc = Temperature of the cold reservoir'
Th = Temperature of the hot reservoir
Therefore;Th = Tc / (1 - η)
= (35 + 273.15) K / (1 - 0.68)
= 1093.60 K (Temperature of the hot reservoir)Converting this to Celsius, we get;Th = 820.45°C
Therefore, the temperature of the hot reservoir is 820.45°C.
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An emf of 15.0 mV is induced in a 513-turn coil when the current is changing at the rate of 10.0 A/s. What is the magnetic
flux through each turn of the coil at an instant when the current is 3.80 A? (Enter the magnitude.)
Explanation:
We can use Faraday's law of electromagnetic induction to solve this problem. According to this law, the induced emf (ε) in a coil is equal to the negative of the rate of change of magnetic flux through the coil:
ε = - dΦ/dt
where Φ is the magnetic flux through the coil.
Rearranging this equation, we can solve for the magnetic flux:
dΦ = -ε dt
Integrating both sides of the equation, we get:
Φ = - ∫ ε dt
Since the emf and the rate of current change are constant, we can simplify the integral:
Φ = - ε ∫ dt
Φ = - ε t
Substituting the given values, we get:
ε = 15.0 mV = 0.0150 V
N = 513
di/dt = 10.0 A/s
i = 3.80 A
We want to find the magnetic flux through each turn of the coil at an instant when the current is 3.80 A. To do this, we first need to find the time interval during which the current changes from 0 A to 3.80 A:
Δi = i - 0 A = 3.80 A
Δt = Δi / (di/dt) = 3.80 A / 10.0 A/s = 0.380 s
Now we can use the equation for magnetic flux to find the flux through each turn of the coil:
Φ = - ε t = -(0.0150 V)(0.380 s) = -0.00570 V·s
The magnetic flux through each turn of the coil is equal to the total flux divided by the number of turns:
Φ/ N = (-0.00570 V·s) / 513
Taking the magnitude of the result, we get:
|Φ/ N| = 1.11 × 10^-5 V·s/turn
Therefore, the magnetic flux through each turn of the coil at the given instant is 1.11 × 10^-5 V·s/turn.