The diagram shows a roller-coaster track. Assume that the system is closed. At point E, the roller-coaster has just exit the vertical loop. which chart best shows the relative amounts of potential and kinetic energy of a roller-coaster car at point E?
A.
B.
C.
D.

You and a group of friends are spending your vacation hiking through the mountains. it is cold in the mountains. you will be expending a lot of energy while hiking and you will need plenty of energy to keep you warm. you should pack foods high in to provide the most energy or kilocalories per gram of food. a) carbohydrates b) lipids (fats) c) proteins d) sugars