Why is the light bulb not a closed system?

Air enters a compressor operating at steady state at 1.05 bar, 300 k, with a volumetric flow rate of 93 m3/min and exits at 12 bar, 400 k. heat transfer occurs at a rate of 15.5 kw from the compressor to its surroundings. assuming the ideal gas model for air neglecting kinetic potential energy effects, determine the power in put in kw.

Asher cycles 12 miles in 16 hours. what is his speed?

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