Physics Answers

In the electron positron pair production, the speed of electron is:

A)zero

B)less than the speed of positron

C)equals to speed of positron

D)greater than speed of positron

if the source of light is moving towards the observer, then the speed of light received by the observer will be:

A)decreased

B)increased

C)remain same

D)maximum

1. Compute the force of attraction between two planets (Planet A and Planet B). The mass of Planet A is 12.34 x 10²⁴ kg and Planet B is 364.25 x 10²⁰ kg and the distance between them is 788,354 km. 

COMPUTATION

Compute the Potential Energy of a certain object that is on Earth that is located at the top of a 100-meter building. The mass of the object is 13.7 kg. 

COMPUTATION

1. An inelastic collision occurs in one dimension, in which a 15 kg block traveling at 7.6 m/s collides with a 13.2 kg block traveling at 2.5 m/s in the same direction, and they stick together. What are the velocities of the blocks immediately after the collision?

I. COMPUTATION

1. The momentum of a particle is 50 kg-m/s. If the velocity of the particle is 5 m/s, what is its mass? If the particle is located on a certain planet where the acceleration due to gravity is 5.87 m/s², what is its weight?

An insulating sphere with radius of 20cm carries a uniform volume charge density of 1.5×10-⁶ C/m³. Find the magnitude of the electric field at a point inside the sphere that lies 8.0 cm from the center

Work done by a substance in reversible nonflow manner in accordance with V=100/p3 ft3 where P in psi. Eavaluate the

work done on or by the substance as the pressure increases from 10 psia to 100 psia.

A person does 360J of work in 3.2s to accelerate a bike at 13m/s^2. This changed the velocity by 31m/s. How heavy is the bike. The bike moved 26m

Consider a hollow spherical conductive shell of radius (R) 0.2 m with a fixed

charge of +2.0 x 10-6 C uniformly distributed on its surface.

a. What is the electric field at all points inside the sphere? Express your answer as

a function of the distance r from the center of the sphere. (2 points)

b. What is the electric field outside the sphere? Express your answer as a function

of the distance r from the center of the sphere. (2 points)

c. What if the sphere is a solid conductive sphere? What is the electric field at all

points inside the sphere? Express your answer as function of the distance r from

the center of the sphere