Mrs. Evans, a 52 kg hiker, climbs to the summit of Mount Mitchell in western North Carolina. During one 2.0 hr (change to seconds!) hike, her vertical height increases 540m. Determine the power generated to increase the gravitational potential energy of the system.

Air is contained in a variable-load piston-cylinder device equipped with a paddle wheel. initially, air is at 400 kpa and 17°c. the paddle wheel is now turned by an external electric motor until 75 kj/kg of work has been transferred to air. during this process, heat is transferred to maintain a constant air temperature while allowing the gas volume to triple. calculate the required amount of heat transfer in kj/kg.