Arock is at the top of a 20 meter tall hill. the rock has a mass of 10kg. how much potential energy does it have?

Observations show that interstellar clouds can have almost any shape and

Abag of potato chips contains 2.00 l of air when it is sealed at sea level at a pressure of 1.00 atm and a temperature of 20.0 deg c. what will be the volume of the air in the bag if you take it with you, still sealed, to the mountains where the temperature is 7.00 deg c and atmospheric pressure is 70.0 kpa? assume that the bag behaves like a balloon and that the air in the bag is in thermal equilibrium with the outside air.

What is the difference between mass density and weight density?