Calculate the force of gravity on a 1-kilogram box located at a point 1.3 x 10 meters from the center of Earth if the force on a 2.5-kilogram box at the same point is
6.1 newtons

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.