28. identify whether the following objects are in
"freefall" or "not in freefall."
a. a baseball after it has been
hit:
b. a rock that is thrown in the
air:
c. the moon:
d. a paper airplane:
e. a bird flying:

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.

What is the rate of change in a objects position?

The energy equivalent of the rest mass of an electron is