If a wave hits a smooth surface at an angle of incident of 40 degrees the angle of reflection is

Debbie places two shopping carts in a cart corral she pushes the first cart which then pushes a second cart what force is being exerted

What is the angular momentum of the bar about the axle?

A14 kg rock starting from rest free falls through a distance of 5.0 m with no air resistance. find the momentum change of the rock caused by its fall and the resulting change in the magnitude of earths velocity. earth mass is 6.0 * 10^24 kg. show your work assuming the rock earth system is closed.