A40.0 kg crate is being lowered by means of a rope. its downward acceleration is 3.80 m/s2. what is the force exerted by the rope on the crate? a 40.0 kg crate is being lowered by means of a rope. its downward acceleration is 3.80 m/s2. what is the force exerted by the rope on the crate?

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.