A given system of unknown internal structure performs the task of lifting a 1 lb( 0.454 kg) weight by one 1 ft (0.305m), in Earth's gravitational field(g= 9.8 m/s^2), with a steady lifting rate of 0.5 ft/s, so it takes the system 2s to complete the process. All of the energy exhcanged btwn the system and the surroundings comes from a chemical porcess( battery) inside the system, which produces a steady power of 1W (and is only turned on during the lifting process). The system is connected to a heat-sink, which keeps it at a constant temp. You may assume that both the weight and the heat-sink are part of the surroundings.

A. How much work was exchanged in the above process?

B. How much energy is dissipated as heat, which is exchanged btwn the system and the heat-sink?

C. What is the delta U for the above process?

D. If the system were not connected to a heat-sink, would you expect its temp. to increase or decrese during the weight-lifting process.