the wave speed on a string is 150 m/s when the tension is 66.0 n . part a what tension will give a speed of 185 m/s ?

The magnitude of the buoyant force is 30 N / 0.8 = 37.5 N. The buoyant force is the upward force exerted by a fluid on an object immersed in it.

It is equal to the weight of the fluid displaced by the object. In this case, the object is floating motionless, which means that the buoyant force is equal to the weight of the object.

The weight of the object is given by its mass multiplied by the acceleration due to gravity (g), which is 10 m/s^2. Therefore, the weight of the object is 3 kg x 10 m/s^2 = 30 N.

The specific gravity of the fluid is 0.8, which means that the fluid is lighter than water. The magnitude of the buoyant force is equal to the weight of the fluid displaced by the object, which is equal to its own weight divided by the specific gravity of the fluid.

Therefore, the magnitude of the buoyant force is 30 N / 0.8 = 37.5 N. None of the given options match the calculated value, so the answer is not among the options provided.

learn mere about buoyant force here: brainly.com/question/21990136

#SPJ11

The tension in string A (TA) is 154,335 N, and the tension in string B (TB) is 37,200 N.

Στ = 0
The torques involved are due to the tension in string A (TA), the weight of the bar (m1 * g), and the weight of the object (m2 * g).
τ_A = TA * d
τ_m1 = (m1 * g) * (L/2)
τ_m2 = (m2 * g) * x
Now, we set up the equation:
TA * d - (m1 * g) * (L/2) - (m2 * g) * x = 0
Solve for TA:
TA = ((m1 * g) * (L/2) + (m2 * g) * x) / d
TA = ((80 * 9.807) * (5.1/2) + (3500 * 9.807) * 4.9) / 1.2
TA = 154335.46 N (rounded to four significant figures)
Now, to find TB, we need to use the fact that the net vertical force is also zero since the bar is in equilibrium.
ΣFy = 0
TB - TA - m1 * g - m2 * g = 0
Solve for TB:
TB = TA + m1 * g + m2 * g
TB = 154335.46 + (80 * 9.807) + (3500 * 9.807)
TB = 37199.60 N (rounded to four significant figures)

Hence, the tension in string A (TA) is 154,335 N, and the tension in string B (TB) is 37,200 N.

learn more about torques click here:

https://brainly.com/question/17512177

#SPJ11

The concentration of the solution as mass percentage, % (m/m), is an option (b) 14.6 %.

To express the concentration of a solution as % (m/m), we need to know the mass of the solute and the mass of the solution. In this case, we have a solution that contains 35 g of KBr dissolved in 205 g of water.

To calculate the concentration of the solution as the mass percentage, we need to divide the mass of KBr by the total mass of the solution and then multiply by 100:

% (m/m) = (mass of KBr / mass of solution) x 100

The mass of the solution is the sum of the mass of KBr and the mass of water:

mass of solution = mass of KBr + mass of water
mass of solution = 35 g + 205 g
mass of solution = 240 g

Now we can calculate the % (m/m) concentration of the solution:

% (m/m) = (35 g / 240 g) x 100
% (m/m) = 0.146 x 100
% (m/m) = 14.6 %

Therefore, the concentration of the solution that contains 35 g of KBr dissolved in 205 g of water as % (m/m) is 14.6 %.

To know more about mass percentage, refer here:

https://brainly.com/question/31309409#

#SPJ11

The closest distance of approach, d, the alpha particle will come to the nucleus is given by d = k * q₁ * q₂ / K.E. = k * 79 * e² / K.E

To find the closest distance of approach d that an alpha particle will come to a gold nucleus (Z=79), we can use the concepts of energy conservation and the Coulomb force.

1. An alpha particle (with two protons and two neutrons) is given an initial nonrelativistic velocity at a far distance from a gold nucleus (Z=79). At this far distance, we can assume that the potential energy due to the Coulomb force is negligible.

2. As the alpha particle approaches the gold nucleus, it experiences an electrostatic repulsive force due to the Coulomb interaction between the alpha particle's charge (2e) and the gold nucleus's charge (79e), where e is the elementary charge.

3. The total mechanical energy of the system is conserved. The initial kinetic energy (KE) of the alpha particle is converted to potential energy (PE) due to the Coulomb force as the particle approaches the gold nucleus.

4. At the closest distance d, the alpha particle's KE is minimum (zero), and its PE is maximum. The initial KE is equal to the maximum PE.

5. The Coulomb potential energy formula is:

PE = k * q₁ * q₂ / r,

where k is Coulomb's constant, q₁ and q₂ are the charges, and r is the distance between them.

Here, q₁ = 2e, q₂ = 79e, and r = d.

6. Using the conservation of energy:

Initial KE = Maximum PE, .
[tex]\frac{k * q₁ * q₂}{r}[/tex] = K.E.

Rearranging for d:

d = k * q₁ * q₂ / K.E. = k * 79 * e² / K.E.

By following these steps and solving for d, the closest distance the alpha particle will come to the gold nucleus can be found.

To know more about the closest distance of approach, refer here:

https://brainly.com/question/14946996#

#SPJ11

The yield strength of a material is significantly less than the "ideal" yield strength due to the presence of defects, dislocations, and imperfections in the material's microstructure.

In an ideal, perfect crystal lattice structure, the atoms are perfectly aligned, and the yield strength would be at its maximum value.

However, in reality, materials have dislocations, defects, and imperfections within their microstructure. These imperfections act as stress concentrators, making it easier for the material to deform when subjected to an external force.
When a material is subjected to stress, the dislocations within the material begin to move, causing plastic deformation. This movement of dislocations is hindered by the presence of defects and imperfections, which prevent the material from reaching its ideal yield strength.

Therefore, the actual yield strength of a material is lower than the ideal value due to the presence and interaction of these microstructural imperfections.
The yield strength of a material is significantly less than the "ideal" yield strength because the presence of defects, dislocations, and imperfections in the material's microstructure negatively affects the material's ability to withstand stress, leading to a lower yield strength value in practice.

For more information on yield strength kindly visit to

https://brainly.com/question/29317141

#SPJ11

Therefore, the vertical displacement of the pendulum bob at 20 degrees is approximately 0.0603 meters.

To find the vertical displacement of a pendulum bob at a certain angle, we can use the formula:

h = L - L*cos(theta)

where:

h is the vertical displacement of the pendulum bob

L is the length of the pendulum

theta is the angle the pendulum makes with the vertical

Assuming the pendulum is released from the vertical position and swings to 20 degrees, we can use this formula with L = 1 (meter) and theta = 20 degrees:

h = 1 - 1*cos(20)

h = 1 - 0.9397

h = 0.0603 meters

To know more about vertical displacement,

https://brainly.com/question/31380834

#SPJ11

Since the image is inverted, the negative sign indicates that it is actually 8.25 cm below the principal axis, so the actual height of the image is 8.25 cm.

To determine the location and size of the image formed by a concave mirror, we can use the following ray diagram:

Draw a ray parallel to the principal axis that passes through the focal point F and then reflects back through the mirror along the same path.

Draw a ray that passes through the focal point F and then reflects back parallel to the principal axis.

Draw a ray that passes through the center of curvature C of the mirror and then reflects back along the same path.

The point where these three rays intersect is the location of the image.

Using this method, we can find that the image of the object is located at a distance of 0.50 m behind the mirror, and it is inverted and reduced in size.

To determine the size and location of the image using the mirror and magnification equations, we can use the following formulas:

1/f = 1/p + 1/q, where f is the focal length of the mirror, p is the distance of the object from the mirror, and q is the distance of the image from the mirror.

m = -q/p, where m is the magnification of the image.

Substituting the given values, we get:

1/0.75 = 1/2.0 + 1/q

Solving for q, we get q = 0.50 m.

m = -q/p

Substituting q = 0.50 m and p = 2.0 m, we get m = -0.25.

This means that the image is located 0.50 m behind the mirror, it is inverted, and its height is 0.25 times the height of the object. Therefore, the height of the image is:

h' = m * h

= -0.25 * 33 cm

= -8.25 cm.

To know more about focal length,

https://brainly.com/question/29870264

#SPJ11

(a) This is because the lowest three standing wave vibration frequencies for a closed-open pipe correspond to odd harmonics (1st, 3rd, and 5th).

As for the length of the pipe, we can use the formula L = (n/4) * wavelength, where n is the harmonic number and wavelength is the distance between two adjacent nodes. For the first harmonic (n=1) with a frequency of 120 Hz, the wavelength is four times the length of the pipe. Thus, L = (1/4) * wavelength = (1/4) * (4L) = L. Solving for L, we get L = wavelength/4 = (speed of sound)/(4 * frequency) = 0.71 meters (assuming the speed of sound in air is 343 m/s).

(b), the frequencies of the first two harmonic vibrations on a pipe of the same length but of the other type (open-closed) can be found using the formula f = (n * v)/(2L), where v is the speed of sound in air and n is the harmonic number. For the first harmonic (n=1), we have f = v/(2L) = (343 m/s)/(2 * 0.71 m) = 242 Hz. For the second harmonic (n=2), we have f = 2v/(2L) = (2 * 343 m/s)/(2 * 0.71 m) = 485 Hz.

Therefore, the frequencies of the first two harmonic vibrations on an open-closed pipe of the same length are 242 Hz and 485 Hz, respectively.

Hence, The formula for the frequency of a standing wave in a pipe depends on the speed of sound, the length of the pipe, and the harmonic number.

learn more about frequencies click here:

https://brainly.com/question/254161

#SPJ11

Fuses are electrical safety devices that protect electrical circuits from overloading or short-circuiting.

They work by interrupting the flow of electrical current when it exceeds a safe level, which prevents damage to the circuit and the connected devices.

Fuses contain a metal wire or filament that melts when the current becomes too high, breaking the circuit and stopping the flow of electricity. This protects the circuit from damage and prevents fires or other hazards.

Fuses are necessary because they provide a crucial layer of protection for electrical systems, ensuring that they operate safely and reliably. Without fuses, electrical circuits could overload or short-circuit, leading to costly and dangerous damage.

learn more about fuses here:brainly.com/question/30507272

#SPJ11

To determine the direction of the electric field at point E, we need to understand the basic concept of an electric field.

An electric field is a vector quantity that shows the direction and magnitude of the force experienced by a positive test charge placed in the field.

The electric field lines originate from positive charges and terminate at negative charges. In this case, we don't have information about the charges or their locations.

However, if you provide more context or a diagram related to the points mentioned (G, B, H, C, F), I will be able to give you a more accurate and helpful answer.

learn more about electric field here:https://brainly.com/question/15800304

#SPJ11

The toughness/strength trade-off is a concept that describes the relationship between the ability of a material to withstand stress or deformation (strength) and its ability to resist fracture or failure (toughness).

Generally, materials that are stronger are often less tough, and those that are tougher are often less strong. This is because the properties that make a material strong, such as its hardness and stiffness, often make it more susceptible to brittle fracture, while materials that are tough, such as those that can absorb a lot of energy before breaking, often have lower strength. Thus, when designing materials for specific applications, engineers must carefully balance the desired levels of toughness and strength to ensure that the material can perform its intended function without failing.

The toughness-strength trade-off refers to the balance between a material's ability to absorb energy before fracturing (toughness) and its ability to resist deformation under an applied load (strength). In many cases, as the strength of a material increases, its toughness decreases, and vice versa. This trade-off is important to consider when selecting materials for specific applications, as engineers must find the right balance between the material's strength and toughness to meet the desired performance criteria.

To know more about toughness visit:

https://brainly.com/question/31324976

#SPJ11

carefully monitor the reaction progress and adjust the reaction conditions as needed to ensure the desired reaction proceeds efficiently.

The best way to avoid excessive formation of byproduct and to minimize side reactions is to carefully control the reaction conditions, such as temperature and reactant concentrations. When nitration of an aromatic compound is carried out at higher temperatures, there is a greater chance of getting more than one nitro group substituted onto the ring (dinitro). Therefore, it is important to optimize the reaction conditions to achieve the desired level of nitration. Additionally, some side reactions may occur at a slower rate, which can impact the overall yield of the desired product. To minimize these side reactions, it is important to carefully monitor the reaction progress and adjust the reaction conditions as needed to ensure the desired reaction proceeds efficiently.

Learn more about reaction progress.

brainly.com/question/22353734

#SPJ11

The stem loop structure directly involved in transcriptional termination of the trp operon is:  formation of the 1-4 stem loop.(C)

The trpL attenuator region has several stem loop structures, but the 1-4 stem loop is specifically involved in transcriptional termination. When tryptophan levels are high, the ribosome stalls at the leader peptide coding region, allowing the formation of the 1-2 and 3-4 stem loops.

The 3-4 stem loop facilitates the formation of the 1-4 stem loop, which is the transcription terminator structure. This leads to the dissociation of the RNA polymerase, thus terminating transcription of the trp operon and preventing the synthesis of unnecessary tryptophan synthesis enzymes.(C)

To know more about transcriptional termination click on below link:

https://brainly.com/question/24174560#

#SPJ11

1 is positive, 2 is neutral, and 3 is negative. Therefore, option (C) is correct.

Charged particles' Lorentz force is modified by the magnetic field in the circumstance where the magnetic field is out of the page. According to the right-hand rule, the palm symbolises the force when the fingers point in the particle's velocity and the thumb points in the magnetic field.

Positively charged particles curve clockwise due to the Lorentz force, which pushes them perpendicular to their velocity and magnetic field. As the force works in the opposite direction for negatively charged particles, they curve anticlockwise.

Since particle 1's route is clockwise, it must be positively charged. Since it goes straight and is unaffected by the magnetic field, particle 2 is neutral. Due to its anticlockwise motion, particle 3 must be negatively charged. Therefore, option (C) is correct.

Learn more about magnetic field, here;

https://brainly.com/question/14848188

#SPJ12

Classical physics can offer insight into the vibrational motion of molecules, even though quantum mechanics is typically used. A classical model considers vibrational motion as simple harmonic motion of atoms connected by a spring. In a diatomic molecule, the hydrogen atom can be treated as oscillating while the iodine atom remains stationary in the H-I molecule.

The amplitude of the vibrational motion in a diatomic molecule HI, where quantum mechanics is used to describe vibrational motion but classical physics provides some insight:

1. In the classical model, the vibrational motion can be treated as simple harmonic motion (SHM) of the atoms connected by a spring.

2. For a diatomic molecule like HI, where one atom (iodine) is much more massive than the other (hydrogen), we can treat the hydrogen atom as oscillating in SHM while the iodine atom remains at rest.

However, to determine the amplitude of the vibrational motion, we need additional information such as the energy of the system, the spring constant, or the initial conditions of the motion. Without this information, it is not possible to provide a specific amplitude for the vibrational motion in the HI molecule.

To know more about the amplitude refer here :

https://brainly.com/question/8662436#

#SPJ11

find the distances to other variable stars in nearby galaxies out to roughly 25 Mpc is called the Cepheid variable method.

Step 1: Identify Cepheid variable stars in nearby galaxies. These stars have a distinct relationship between their luminosity and pulsation period.

Step 2: Measure the pulsation period of the Cepheid variable star, which helps determine its intrinsic luminosity.

Step 3: Observe the apparent brightness of the Cepheid variable star from Earth.

Step 4: Apply the distance modulus formula, which relates the difference between the intrinsic luminosity and the apparent brightness to the distance.

Step 5: Calculate the distance to the Cepheid variable star, and thus to the nearby galaxy it resides in, using the distance modulus formula and the obtained values from Steps 2 and 3.

By following this procedure, astronomers can accurately determine distances to other variable stars in nearby galaxies out to roughly 25 Mpc.

To know more about Cepheid variable stars :

https://brainly.com/question/29109870

#SPJ11

The length of the guitar string required to produce a fundamental frequency of 256 Hz is approximately 0.79 meters.

To determine the length of the guitar string required to produce a fundamental frequency of 256 Hz, we need to use the formula for the speed of waves in a string:

v = fλ

Where v is the speed of waves in the string, f is the frequency, and λ is the wavelength.

We know that the speed of waves in the particular guitar string is 405 m/s and we want to produce a fundamental frequency of 256 Hz. To find the wavelength, we rearrange the formula as:

λ = v/f

λ = 405/256

λ = 1.58 m

Now that we know the wavelength, we can find the length of the string required to produce this frequency using the formula:

L = n(λ/2)

Where L is the length of the string, n is the number of half-wavelengths that fit in the string, and λ is the wavelength.

Since we want to produce the fundamental frequency (1st harmonic), n = 1. Therefore:

L = (1)(1.58/2)

L = 0.79 m

So, the length of the guitar string required is approximately 0.79 meters.

To know more about fundamental frequency, refer here:

https://brainly.com/question/29264927#

#SPJ11

Option d. The wavelength of the light decreases as it enters into the medium with the greater index of refraction.

The index of refraction is the measure of how much a material can bend the path of light as it passes through it.

When light crosses a boundary between two transparent materials, the speed of the light changes, and this causes the wavelength of the light to change as well.

If the medium the ray enters has a larger index of refraction, the light bends more, and the wavelength of the light decreases.

Hence, When a ray of light crosses a boundary between two transparent materials, and the medium the ray enters has a larger index of refraction, the wavelength of the light decreases. The speed of the light remains constant, and the frequency of the light remains constant as well.

learn more about wavelength click here:

https://brainly.com/question/10728818

#SPJ11

The lateral displacement of light due to refraction in this parallel-sided glass block is 2.27 cm.

To calculate the lateral displacement xy of light due to refraction, we need to use the formula:
xy = t x sin(theta)
where t is the thickness of the glass block and theta is the angle of incidence.
Since the surfaces of the glass block are parallel, the angle of incidence is equal to the angle of emergence, which is also equal to the angle of refraction. Therefore, we can use Snell's law to find the angle of refraction:
n1 x sin(theta1) = n2 x sin(theta2)
where n1 and n2 are the refractive indices of the media on either side of the glass block.
Assuming that the glass block is surrounded by air (which has a refractive index of approximately 1), we can write:
sin(theta1) = sin(0) = 0
and
sin(theta2) = n1/n2
Substituting these values into Snell's law, we get:
n1 x 0 = n2 x (n1/n2)
which simplifies to:
theta2 = sin^-1(n1/n2)
Now we can use this angle and the thickness of the glass block to calculate the lateral displacement:
xy = t x sin(theta) = t x sin(theta2)
Substituting the values for n1, n2, and t, we get:
xy = 3 cm x sin(sin^-1(1.5/1.0)) = 3 cm x sin(48.2 degrees) = 2.27 cm

learn more about displacement Refer: https://brainly.com/question/11934397

#SPJ11

The resistivity of the wire material is 2.56 × 10⁻⁷ Ωm.

The wire has a length of 11.0 m, a width of 1.6 mm, and a thickness of 0.11 mm. The car battery provides 12.0 V, and the current drawn is 7.5 A.

To find the resistivity, follow these steps:

1. Calculate the resistance (R) using Ohm's law: V = IR.
2. Calculate the cross-sectional area (A) of the wire.
3. Use the formula for resistivity: ρ = RA/L.

Step 1: Calculate the resistance (R).
R = V/I = 12.0 V / 7.5 A = 1.6 Ω

Step 2: Calculate the cross-sectional area (A) of the wire.
A = width × thickness = (1.6 × 10⁻³ m) × (0.11 × 10⁻³ m) = 1.76 × 10⁻⁷ m²

Step 3: Use the formula for resistivity (ρ).
ρ = RA/L = (1.6 Ω)(1.76 × 10⁻⁷ m²) / (11.0 m) = 2.56 × 10⁻⁷ Ωm

To know more about resistivity  click on below link:

https://brainly.com/question/29427458#

#SPJ11

The statement "A rock at the top of a slope that starts to roll down, it is losing kinetic energy and gaining potential energy." is TRUE.

A rock at the top of a slope that starts to roll down is losing kinetic energy and gaining potential energy. As the rock rolls down the slope, it gains speed and kinetic energy, while losing potential energy due to its changing elevation.

At the bottom of the slope, the rock will have gained its maximum kinetic energy while having the least potential energy. This phenomenon can be explained by the Law of Conservation of Energy, which states that energy cannot be created or destroyed, only transferred or transformed from one form to another.

In this case, the potential energy of the rock at the top of the slope is transformed into kinetic energy as it rolls down the slope.

To know more about Law of Conservation of Energy click on below link:

https://brainly.com/question/12050604#

#SPJ11

As I look through the hole on the right side of the closed opaque box, I can see a small light bulb that is on inside the box. However, due to the presence of a wall inside the box and the rough surfaces of all the box's surfaces that are painted black, I may not be able to see the entire contents of the box, but only a portion of it.

Based on the given information, when you look through the hole in the closed opaque box with rough surfaces painted black, you will see the small light bulb that is on. The wall inside the box may obstruct some parts of the interior, but the light emitted by the bulb will allow you to see it and possibly some nearby surfaces, although they will appear dark due to the black paint.

To know more about opaque box click here:

https://brainly.com/question/13317813

#SPJ11

To compare the kinetic energy of the two objects, we can use the formula KE = 1/2mv^2, where KE is kinetic energy, m is mass, and v is velocity.

For the truck, its mass is 22,000 kg and velocity is 130 km/h. We need to convert velocity to meters per second, which is 36.11 m/s. Plugging in the values, we get KE = 1/2 * 22,000 kg * (36.11 m/s)^2 = 14,930,557 J.

For the astronaut, its mass is 81.5 kg and velocity is 28,000 km/h. We need to convert velocity to meters per second, which is 7,777.78 m/s. Plugging in the values, we get KE = 1/2 * 81.5 kg * (7,777.78 m/s)^2 = 22,414,774,038 J.

As we can see, the kinetic energy of the astronaut in orbit is significantly greater than that of the truck moving at high speed. This is because kinetic energy is directly proportional to both mass and velocity, and the astronaut has a much higher velocity despite having a smaller mass.

To Learn more about Kinetic Energy :

https://brainly.com/question/11592500

#SPJ11

The electrically charged particles that produce electric currents and therefore magnetic fields when they move inside Uranus and Neptune are primarily ionized gases, specifically a mix of hydrogen, helium, and methane ions.

Both Uranus and Neptune have magnetic fields that are tilted with respect to their rotation axes, and they also exhibit periodic variations in their magnetic fields. These phenomena are thought to be caused by the motion of electrically charged particles in their interiors.

The interiors of Uranus and Neptune are believed to consist of a rocky core surrounded by layers of liquid water, methane, and ammonia. Above these layers lies a thick atmosphere consisting mainly of hydrogen and helium with traces of methane.

Due to the extreme pressure and temperature within their interiors, the hydrogen and methane in these atmospheres become ionized, meaning they lose or gain electrons and become electrically charged. These ionized gases then move and flow, creating electric currents and magnetic fields.

To know more about magnetic fields, refer here:
https://brainly.com/question/11514007#
#SPJ11

The resilience of a material is defined as the ratio of the energy stored in the material to the energy required to deform it. Mathematically, resilience is given by the equation.

Resilience = (Energy stored) / (Energy required to deform)

Given that the resilience of the protein resilin is 0.92, we can use this information to determine the energy required to stretch it, as well as the energy stored when it relaxes.

Let's denote the energy required to stretch the resilin as W and the energy stored when it relaxes as 6.00 J (given in the question).

Resilience = (Energy stored) / (Energy required to deform)

0.92 = 6.00 J / W

Solving for W, we can rearrange the equation as:

W = (Energy stored) / (Resilience)

W = 6.00 J / 0.92

Plugging in the given values, we can calculate the energy required to stretch the resilin:

W = 6.00 J / 0.92

W ≈ 6.52 J

So, the work done to stretch the resilin is approximately 6.52 J.

Learn more about  protein   here:

https://brainly.com/question/29776206

#SPJ11

When comparing the energy required for a car to accelerate from 0 to 30 mph (scenario A) and from 30 to 60 mph (scenario B), the second scenario (B) requires more energy.

This is because the kinetic energy of an object is given by the formula KE = 0.5 * m * v^2, where m is the mass of the object and v is its velocity. As the velocity increases, the kinetic energy increases quadratically, meaning the energy required to accelerate from 30 to 60 mph is greater than from 0 to 30 mph.

In scenario A, the car starts from rest and accelerates to 30 mph. At the beginning, the car has zero velocity, so it has no kinetic energy. As it accelerates, its velocity increases, and so does its kinetic energy.

However, the velocity is relatively low, so the kinetic energy is not very high. Since the car is accelerating over a shorter distance and time, it requires less energy to reach 30 mph.

In scenario B, the car is already moving at 30 mph when it starts to accelerate to 60 mph. At the beginning, the car already has some kinetic energy from its initial velocity of 30 mph.

As it accelerates, its velocity increases, which means the kinetic energy increases even more. However, the velocity is already relatively high, so the kinetic energy is much higher than in scenario A. Since the car is accelerating over a longer distance and time, it requires more energy to reach 60 mph.

To learn more about distance, refer below:

https://brainly.com/question/15172156

#SPJ11

The difference between the sum of 2 protons, 2 neutrons, and 2 electrons (4.0322980 amu) and the measured mass of helium (4.00260 amu) is due to the release of energy during the formation of helium. When two hydrogen atoms combine to form helium,.

some of the mass is converted to energy in accordance with Einstein's famous equation E=mc^2. This energy is released in the form of light and heat. Therefore, the missing mass is converted to energy during the formation of helium. When protons, neutrons, and electrons come together to form an atom, some of the mass is converted into energy, which is used to hold the nucleus together. In the case of helium (He), the mass defect is 0.0296980 amu. This mass is converted into energy to maintain the stability of the helium nucleus.

To know more about energy mass click here:

brainly.com/question/1129555

#SPJ11

The minimum coefficient of static friction required is approximately 0.788. ,  For an automobile to round a 130m radius curve on a level road, banked at the correct angle for 20 m/s, at 30 m/s without skidding.

The coefficient of static friction (μs):
μs = (v² / r - g * tanθ) / (g + v² * tanθ / r)Where:
v = speed of the automobile (30 m/s)
r = radius of the curve (130 m)
g = acceleration due to gravity (9.81 m/s²)
θ = bank angle (calculated using the given speed of 20 m/s)
First, we find the bank angle (θ) using the given speed of 20 m/s:
tanθ = (v₀²) / (r * g)
tanθ = (20²) / (130 * 9.81)
tanθ ≈ 0.314
θ ≈ 17.32
Now, we plug in the values into the formula for the coefficient of static friction:
μs ≈ (30² / 130 - 9.81 * 0.314) / (9.81 + 30² * 0.314 / 130)
μs ≈ 0.788

Hence,  For an automobile to round a 130m radius curve on a level road, banked at the correct angle for 20 m/s, at 30 m/s without skidding, the minimum coefficient of static friction between tires and road needed is approximately 0.788.

learn more about friction click here:

https://brainly.com/question/24338873

#SPJ11

The energy change, ΔE, when an electron goes from the n = 2 shell to the n = 3 shell in a hydrogen atom is positive.

To calculate the energy change, follow these steps:

1. Write the formula for the energy of the hydrogen atom: E = -C/n²
2. Substitute n = 2 for the initial shell: E₁ = -C/2² = -C/4
3. Substitute n = 3 for the final shell: E₂ = -C/3² = -C/9
4. Calculate the energy change ΔE: ΔE = E₂ - E₁ = (-C/9) - (-C/4)
5. Simplify ΔE: ΔE = C(4 - 9) / (9 * 4) = 5C/36

So, the energy change when an electron goes from the n = 2 shell to the n = 3 shell in a hydrogen atom is positive, with a value of 5C/36.

To know more about hydrogen atom click on below link:

https://brainly.com/question/29695801#

#SPJ11