A granite rock of mass 1000 kg is situated on a hill at an elevation of 1000

Question:

A granite rock of mass 1000 kg is situated on a hill at an elevation of 1000 m. On a sunny day its temperature rises to 95oC.
(a) Determine the maximum useful work that can be extracted from the rock if the atmospheric temperature is 30oC.
(b) Compare the potential energy (PE) of the rock with its stored energy (Φ). Use the SL system state daemon.