Atourist bus is carrying passengers from the bottom of a hill to the top. the people, the bus, and the luggage can be analyzed as a
the total amount of energy in the
as the bus travels. this situation happens because some
the kinetic energy changes to
energy because of friction between the tires and the road.

Bob, a nutritionist who works for the university medical center, has been asked to prepare special diets for two patients, susan and tom. bob has decided that susan's meals should contain at least 320 mg of calcium, 17 mg of iron, and 42 mg of vitamin c, whereas tom's meals should contain at least 280 mg of calcium, 13 mg of iron, and 34 mg of vitamin c. bob has also decided that the meals are to be prepared from three basic food