What types of energy are used in space research?

Alfred pushes on a heavy box, but cannot move it. the box has a lot of inertia motion friction gravity

Mga halaman/punong ornamental na di namumulaklak

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.