If 20 waves of water pass you in 10.0 s and the waves are 2.0 m long, how fast are they moving? 2.0 m/s 8.0 m/s 1.0 m/s 4.0 m/s

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.