If the Applied Force (force exerted) on both crates with the current Friction setting is 350N, the acceleration is If the Applied Force (force exerted) on both crates with the current Friction setting is 350, the acceleration is

a. initially 1 m/s2, and then it increases as the crates' speed increases.
b. roughly 3.5 m/s2.
c. a constant 1 m/s2.

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.