Which of the following objects will exert the greatest gravitational force on a box, if the distance between them remains the same? 2 kg mass
4 kg mass
6 kg mass
8 kg mass

The least penetrating form of radiation is

Where do magnetic lines of force enter earth?

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.