Which statement describes the motion of the sun? (2 points)

A. The sun does not rotate.
B. The sun moves around the earth
C. The sun orbits the solar system
D. The sun rotated on an axis

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.