an electric hoist is used to lift a piece of equioment 2 feet. the diameter od the drum on the hoist is 10 inches. find the nuymber of degrees through which the drum must rotate.

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.

What is the weight of a feather (mass = 0.0001 kg) that floats through earth's and the moon's atmospheres?

If the specific heat of a metal is 0.850 j/g °c, what is its atomic weight?