Power compression is caused by two things: 1) The heating up of a driver's voice coil which causes the impedance of the speaker to increase. 2) As speakers are pushed harder they near their mechanical limits and they become non-linear.

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.