Review the interior layers of the Earth. Within the mantle exists the asthenosphere between about 100 km and 350 km, which is a special zone composed of hot, magma-like material that is capable of gradual flow. The energy that produces this flowable magma comes from the heat within the Earth, What is/are the source(s) of this heat energy?

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.