Alittle ? dora rolled a marble down a ramp and recorded the potential energy and kinetic energy of the marble at different positions on the ramp, as shown in the table. (look at picture) which is the constant variable in this experiment? a. mass of marble b. kinetic energy of marble c. potential energy of marble d. height of marble from ground

Acompound machine is also called a machine. a. force b. simple c. complex d. directional

The two required components for a generator are

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.