An ungraduated mercury thermometer 'Q" attached to millimeter scale reads 22.8mm in ice and 252.4mm in steam at standard pressure. What will it read on a day when temperature is 30 F

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.