Which of the following tasks would best an individual achieve a goal to obtain a driver's license?
a. practicing driving
b. reviewing the vehicle manual
c. understanding inspection laws
d. saving for a car

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.