Two children are throwing a ball back-and-forth straight across the back seat of a car. the ball is being thrown 9 mph relative to the car, and the car is travelling 45 mph down the road. if one child doesn't catch the ball and it flies out of the window, in what direction does the ball fly ? (ignoring wind resistance)

A47.2 g block of copper whose temperature is 480 k is placed in an insulating box with a 91.8 g block of lead whose temperature is 200 k. (a) what is the equilibrium temperature of the two-block system? (b) what is the change in the internal energy of the two-block system between the initial state and the equilibrium state? (c) what is the change in the entropy of the two-block system? the heat capacities of copper and lead are 386 j/kg·k and 128 j/kg·k, respectively.