Write a hypothesis about the effect of the angle of the track on the acceleration of the cart. Use the "if ... then
.. because ..." format and be sure to answer the lesson
question: "How does an object's position and velocity
change as the object accelerates?”

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.