An engineer on the ground is looking at the top of a building. the angle of elevation to the top of a building is 38á. the engineer knows the building is 300 ft tall. what is the distance from the engineer to the base of the building to the nearest whole foot?

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.