1. A skier has a mass of 80kg. He starts from rest and skis down a slope which drops 50m in height.
a) Calculate the amount of gravitational potential energy the
skier loses skiing down the slope.
b) What kinetic energy does he have at the bottom of the slope?
c) How fast is the traveling skier at the bottom?

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.