Is an object on the surface of earth sitting still relative to outer space?

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.

Compare the horizontal displacement of the two balls as they travel to the ground. what do you observe?

What is the force that opposes motion and works against the downward pull? a) friction b) gravity c) weight d) acceleration