a person tries to move a heavy stone of mass 100 kg for an hour but fails (a).How much worh has to be done on the stone?(b).if instead ,he ,lifts lifts it up to a height of 2m , how much work is done

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.

Boiling water is an example of physical change. true or false

Which would increase mechanical advantage?