A salmon jumps 2.0 m vertically and gains a certain amount of potential energy. A secondsalmon of half the mass jumps the same vertical height. Compared to the first salmon, thesecond salmon’s potential energy gain is? a. one-half as great b. twice as great c. the same d. 4 times as great

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.