(1) Thermal energy from the Sun is falling on the ice at a rate of 250 W/m2. The ice absorbs 60% of this energy.
Calculate the energy absorbed in 1.0s by the 0.25 m2 area of ice on the tray.
energy =

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.