A ball is dropped from rest from the top of a building. What force is responsible for the downward motion of the ball? the force of gravity the force of tension the normal force the pushing force

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.

Photons with the highest energy have the longest period

An object in mechanical equilibrium is an object