Jill applies a force of 15 N to a wrench. If
the wrench applies a force of 150 N to a
bolt, which of these values is the input
force and which is the output force?

Anybody wanna ? (picture included? )

How can waves travel through ground?

Two masses are connected by a rope that hangs over a pulley as shown below. the pulley is a uniform cylinder of radius 푅=0.381meters and mass 푀=3.1푘푔. initially 푚"is on the ground and 푚#rests 2.5 meters above the ground. if the system is released, use conservation of energy to determine the speed of 푚#just before it strikes the ground. assume the pulley bearing is frictionless.