A357-magnum bullet has kinetic energy of 540 ft lb at 50 yards from the pistol. if it strikes and comes to a rest inside a 1.0 kg block of wood (with a specific heat capacity of 1700 j/kg k), by how much would the block's temperature change? the bullet is lead and weighs 158 grains (1.0 grain is equivalent to 0.0648 g).

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.