Forces, Motion, & Speed (6.8B, C & D): Question 3 A student runs two times around a running path at a local park. Each
lap is 3 km. The student completes the first lap in 20 minutes. The
student then sits on a bench and rests for 5 minutes before completing
the second lap in 25 minutes. Which graph best represents the
student's motion?

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.