Acar speeds up as it rolls down a hill. which is this an example of? a. positive acceleration b. negative acceleration c. relative velocity

Which statement best explains why an object weight less on mercury than it does on earth

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.

If a substance is in the gas phase, which of qualities of the gas will stay constant? a: volume b: mass c: shape d: position of particles