An electron is at the origin. (a) Calculate the electric potential V_Aat point A, x= 0.250 cm. (b) Calculate the electric potential V_Bat point B, x= 0.750 cm. What is the potential difference V_B- V_A? (c) Would a negatively charged particle placed at point Anecessarily go through this same potential difference upon reaching point B? Explain.

A sphere of radius 2.09 cm and a spherical shell of radius 6.97 cm are rolling without slipping along the same floor. The two objects have the same mass. If they are to have the same total kinetic energy, what should the ratio of the sphere\'s angular speed to the spherical shell\'s angular speed be? Please provide a clear explanation. I have tried to look this problem u, but I was unable to understand exactly how the solution was found.

A person pushes a 10.5-kg shopping cart at a constant velocity for a distance of 37.6 m on a flat horizontal surface. She pushes in a direction 20.2 ° below the horizontal. A 53.1-N frictional force opposes the motion of the cart. (a) What is the magnitude of the force that the shopper exerts? Determine the work done by (b) the pushing force, (c) the frictional force, and (d) the gravitational force.

Is there a material which can allow light (or any other EM radiation) to pass through from one side as if it is transparent but its other side reflects light like a mirror?

a glass tube both ends are open is dipped inside mercury so that one half is above the mercury level. then the one half of open end is closed and taken out there with a

10 cm long mercury left. if atmospheric pressure is 76cnHG calculate the length of the tube

answer is 16 cm pls explain the answer

When jumping straight down, you can be seriously injured if you land stiff-legged. One way to avoid injury is to bend your knees upon landing to reduce the force of the impact. A 67.3-kg man just before contact with the ground has a speed of 3.81 m/s. (a) In a stiff-legged landing he comes to a halt in 2.92 ms. Find the magnitude of the average net force that acts on him during this time. (b) When he bends his knees, he comes to a halt in 0.255 s. Find the magnitude of the average net force now. (c) During the landing, the force of the ground on the man points upward, while the force due to gravity points downward. The average net force acting on the man includes both of these forces. Taking into account the directions of the forces, find the magnitude of the force applied by the ground on the man in part (b).

Enter numerical answers with THREE SIGNIFICANT FIGURES.

A soap bubble of uniform thickness has an index of refraction of 1.53, and is illuminated by light with a wavelength of 580. nm.

a) Calculate the wavelength of the light in the soap bubble. (Enter THREE sig figs)
nm


Which two rays will interfere with each other?


How many ½ λ shifts must be considered, and where do these shifts (if any) occur? Briefly explain your answer.



c) What is the minimum thickness of a soap bubble such that the light is strongly reflected? (Enter THREE sig figs)
nm

Question 10

The statements in the following list all refer to Quantum Physics. Check the boxes of the THREE CORRECT statements.

1. In the photoelectric effect, the maximum energy of the emitted electrons depends on the frequency of the incoming electromagnetic radiation and not on the intensity. There is a threshold frequency below which no electrons are emitted.

2. Electrons can behave both as particles and as waves.

3. It is not necessary to know the potential energy function of a particle in order to to solve the time-independent Schrödinger equation and obtain the wave function describing it.

4. The allowed energy levels of a particle in an infinite square well are equally spaced.

5. In spectroscopic notation, the letters 's', 'p', 'd', etc. are used to identify the magnetic quantum number m_l associated to a state or energy level.

6. An atom can be stimulated to make a transition from a higher to a lower energy level by a photon of the appropriate energy.

1. Parallel light rays pass through a converging lens and

a. stay parallel

b. all travel to a point that is at a defined distance away from the lens

c. diverge rapidly

d. reflect back to a point in front of the lens

2. For a lens with a given focal length of 10 cm and an object placed 15 cm in front of it, where is the image located?

a. 30 cm

b. 10 cm c. 20 cm

d. 25 cm

3. For problem number 2, what is the magnification?

a. M = 1/2

b. M = -1/2

c. M = 2

d. M = -2

4. For problem number 2, describe the relation of the image height to the object height. Is the

a. image height smaller than the object height

b. image height larger than the object height

c. image height and object height are equal

5. Describe the image that is formed in problem #2. Is it?

a. real and upright

b. real and virtual

c. real and inverted

d. virtual and inverted

6. For a lens with a given focal length of 10 cm and an object placed 5 cm in front of it, where is the image located?

a. 10 cm behind the lens

b. 10 cm in front of the lens

c. 2 cm in front of the lens

d. 2 cm behind the lens

7. For problem number 6, what is the magnification?

a. M = ½

b. M = -1/2

c. M = 2

d. M = -2

8. The letter “B” in the above diagram of a camera is identified as the

a. film

b. shutter

c. lens

d. aperture

9. The letter “D” in the above diagram of a camera is identified as the

a. film

b. shutter

c. lens

d. aperture

10. To create a virtual magnified image of an object,

a) the object must be at the focal point of a concave lens.

b) the object must be just outside the focal point of a convex lens.

c) the object must be very far from a convex lens.

d) the object must be within the focal point of a convex lens.

A point charge of -1C is placed in the center of a spherical shell of radius R and with surface charge density σ=1C/2πR^2.Calculate the magnitude of the electric field inside and outside the sphere. If a test charge q_0 was placed (inside and outside the sphere), what would be the magnitude of the force it would experience?

Mary spots Bill approaching the dorm at a constant rate of 2 m/s on the walkway that passes directly beneath her window, 17 m above the ground. When Bill is 120 m away from the point below her window she decided to drop an apple down to him.

A.) How long should Mary wait to drop the apple if Bill is to catch it 1.75 m above the ground, and without either speeding up or slowing down?

B.) How far from directly below the window is Bill when Mary releases the apple?

A common approximation to the interatomic forces in a material is the Lennard-Jones potential between neighboring atoms in a solid:

U(r) = A/r¹² - B/r⁶

This can be used to find various information about a solid material.

Assume that for the lattice of a particular alloy of copper, the Lennard-Jones constants are:

A = 9.08 ⨯ 10^-133 J·m¹²
B = 3.96 ⨯ 10^-76 J·m⁶

Find the following:

(a) The equilibrium distance between neighboring atoms in the copper lattice (this is called the lattice constant a).


(b) Model this as an approximate potential around the equilibrium position

U_eff(r) = (1/2)k(r-a)² + C

(i) What is the effective spring stiffness k?


(ii) What is the energy minimum C?


(c) Find the resonance frequency of a copper atom in a linear chain of atoms? [Assume only nearest neighbor interactions]


(d) Find the vibration amplitude at the temperature T = 5⁰C. Assume that the oscillator has one degree of freedom.

[ Use k_B = 1.38⨯10^-23 J/K/atom as Boltzmann's constant. ]

1. A box of mass 5kg moves to the left at a speed of 6m/s. The box is moving toward an unstretched spring of spring constant 500N/m that is attached to a barrier. If the floor is frictionless, how much does the spring compress in bringing the box to rest? If instead the floor has a coefficient of friction of 0.4, how much does the spring compress in bringing the box to rest?

Determine the magnitude of the gravitational force Mars would exert on man if he was on the surface of Mars. The mass of the man is 67.0kg . The mass of the Mars is 6.42

1. Explain the difference between linear, radial, and angular acceleration and identify which "G" force vector is most significant in normal aircraft flight.