Mechanics | Relativity Answers

A billiard ball moving at 5.00 m/s strikes a stationary ball of the same mass. After the collision, the first ball moves at 4.33 m/s at an angle of 30.0degrees with respect to the original line of motion. Assuming an elastic collision, find the struck ball's velocity and direction after the collision.

A bullet of mass 10 g traveling horizontally with a velocity of 300 ms- strikes a block of wood of mass 290 g which rests on a rough horizontal floor. After impact, the block and bullet move together and come to rest when the block has traveled a distance of 15 m. Calculate the coefficient of sliding friction between the block and the floor.

A 12.0 g of sticky clay is hurled horizontally at a 100-g wooden block initially at rest on a horizontal surface. The clay sticks to the block. After impact, the block slides 7.50 m before coming to rest. If the coefficient of friction between the block and the surface is 0.650, what was the speed of the clay immediately before impact?

A 10.0-g bullet is fired into a stationary block of wood having a mass of 5.00 kg. The bullet embeds into the block. The speed of the bullet-plus-wood combination immediately after the collision is 0.600 m/s. What was the original speed of the bullet?

A particle of mass m moves with momentum of magnitude p. (a) Show that the kinetic energy of the particle is K = p^2/ 2m. (b) An object has a kinetic energy of 275 J and momentum of magnitude 25.0 kgm/s. Find the
and mass of the object A

. A bomb, initially at rest, explodes into several pieces. (a) Is the linear momentum of the system conserved? Explain. (b) Is the kinetic energy of the system conserved? Explain.

A hunter fires a gun while standing with the bottom of the gun against her shoulder. If the forward momentum of a bullet is the same as the backward momentum of the gun, why is it not dangerous to be hit by the gun as it is by the bullet?

You are standing perfectly still and then take a step forward. Before the step, your momentum was zero, but afterward, you have some momentum. Is the principle of conservation of momentum violated in this case? Explain your answer.

An airbag in an automobile inflates when a collision occurs, which protects the passenger from serious injury. Why does the airbag soften the blow?

A car of mass m traveling at speed v crashes into the rear of a truck of mass 2m that is at rest and in neutral at an intersection. If the collision is perfectly inelastic, what is the speed of the combined car and truck after the collision?