A cannon fires a cannonball at an angle 30 degrees above the horizontal, which flies through the air. It is fired with a force of 1000 N, and the cannonball is 10 kg. The initial height of the cannonball after firing is 0 m.

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.