A 50 kg rock climber ascends a cliff. What is the climber's gravitational potential energy at a point 30 meters above the base of the cliff? Remember earth has a free fall of 9.8 m/s .

2kg of refrigerant 134a undergoes a polytropic process in a piston-cylinder assembly from an initial state of saturated vapor at 2 bar to a final state of 12 bar, 80 degree c. a)determine the work for the process in kj. b)sketch the process on a p-v diagram.

Ms. hidalgo opens the door to her classroom. her classroom is 60 degrees and the air outside is 80. predict what will happen using your knowledge of how heat flows.

The necleus of an atom is made up of what subatomic particles?