You are driving a 2500.0-kg car at a constant speed of 14.0 m/s along a wet, but straight, level road. as you approach an intersection, the traffic light turns red. you slam on the brakes. the car’s wheels lock, the tires begin skidding, and the car slides to a halt in a distance of 25.0 m. what is the coefficient of kinetic friction between your tires and the wet road?

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.