A disc of mass 10g is kept floating horizontally by throwing 10 marbles `s^(-1)` against it from below. If the mass of each marble is 5g, calculate the velocity with which the marbles are striking the disc. Assume that the marbles strike the disc normally and rebound downward with the same speed.

A bullet of mass 10 kg travelling horizontally with a velocity of 150 ms^(-1) strikes a stationary wooden block and come to rest in 0.03 s. Calculate the distance of penetration of the bullet into the block. Calculate the magnitude of force exerted by the wood in block in the bullet.

10 g of a gas at 1 atm and 273 K occupies 5 litres. The temperature at which the volume becomes double for the same mass of gas at the same pressure is:

A bullet of mass 0.012 kg and horizontal speed 70 m s^-1 strikes a block of wood of mass 0.4 kg and instantly comes to rest with respect to the block. The block is suspended from the ceiling by means of thin wires. Calculate the height to which the block rises. Also, estimate the amount of heat produced in the block.

10,000 small balls, each weighting 1g, strikle one square cm of area per second with velocity 100m/s in a normal direction and rebound with the same velocity. The value of pressure on the surface will be:

A ball of mass 50 g falls from a height of 10 m and rebounds to a height of 5 m.Find the impulse and average force between the ball and ground if both were in contact for 0.1 second.

A hockey ball of mass 200 g travelling at 10 ms^( -1) is struck by a hockey stick so as to return it along its original path with a velocity at 5ms^( -1) . Calculate the change in momentum occurred in the motion of hockey ball by the force applied by hockey stick.