A 20-g bullet moving at 1000 m/s is fired through a 1kg block of wood emerging at a speed of 100m/s. what is the change in kinetic energy of the bullet

D. 0.16 KJ

Explanation:

Given the following data;

Initial velocity, U = 1000 m/s

Mass of bullet, M1 = 20 g to kilograms = 20/1000 = 0.02 kg

Mass of block, M2 = 1 kg

Final velocity, V = 100 m/s

To find the change in kinetic energy;

First of all, we would determine the velocity after the collision by applying the law of conservation of momentum.

Substituting into the above formula, we have;

Vf = 18 m/s

Next, we would find the kinetic energy of block-bullet;

Substituting into the formula, we have;

K.E = 162 Joules.

In Kilojoules;

K.E = 162/1000

K.E = 0.162 ≈ 0.16 KJ

the moon affects the earth gravitation ally, causing certain motions of that body and also producing tides in its ocean and atmosphere. the tidal wave in our atmosphere is, however, far too minute to be an effective cause in any known meteorological phenomenon.

explanation:

the duration of a photographic flash is related to an rc time constant, which is 0.100 μs for a certain camera.