20 POINTS Using the velocity time graph below, determine the displacement during the following time intervals:
Show your work/calculations here for parts a, b, and c:
a.) t = 0-4s, Δx =

b.) t = 4-6s, Δx =

c.) t = 6-9s, Δx =

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.