Can someone please help me with this?

Africtionless piston-cylinder contains 50 l of saturated liquid r-134a. the piston has a mass and an area resulting in an applied pressure of 500 kpa on the refrigerant. the refrigerant is now heated until its temperature rises to 70∘c. calculate the work (in kj) done during this process.

Explain what it means to view something from a frame of reference. provide an example that illustrates your explanation. (4 points)

As the distance from a magnet increases, what happens to the magnet force?