Which of the following is known as the pulse of a wave? a non-recurrent wave the trigger of a wave the repeat motion of a wave one cycle of a wave motion the input of energy to cause a wave motion there is more than one

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.