Peer relationships are important to childhood development for all of the following reasons except a. defining friendships in terms of actual activities b. defining friendships in terms of mutual liking and closeness c. using friendships as a context for self-exploration d. using friendships to keep a regular schedule

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.