A75 kg football player is gliding forward across very smooth ice at 4.6 m/s. he throws a 0.47 kg football straight forward. a) what is the player's speed afterward if the ball is thrown at 15 m/s relative to the ground? b) what is the player's speed afterward if the ball is thrown at 15 m/s relative to the player?

1. a net force of 100 newton’s is applied to a wagon for 5 seconds. this causes the wagon to undergo a change in momentum of

Apulley with mass mp and a radius rp is attached to the ceiling, in a gravity field of 9.81 m/s2 and rotates with no friction about its pivot.

Arigid tank is divided into two equal parts by a partition. one part of the tank contains 3 kg of compressed liquid water at 400 kpa and 60°c while the other part is evacuated. the partition is now removed, and the water expands to fill the entire tank. determine the entropy change of water during this process, if the final pressure in the tank is 40 kpa. use steam tables.