18. The law of conservation of energy is a statement that A. Energy must be cons

Question

18. The law of conservation of energy is a statement that A. Energy must be conserved and you are breaking a lawif you waste energy B. The supply of energy is limited so we must conserve C. The total amount of energy is constant D. Energy cannot be used faster than it is created E. All of the above 19. If two objects with different masses collide and bounce off each other, the one with the greater mass A. Feels a larger impulse than the other one B. Feels a smallerimpulse than the other one C. Feels the same impulse as the other one D. It depends on the time of the collision E. It doesn'texperience any impulse 20. In an inelastic collision in which there are no net nonzero external forces, which of the following are NOT true? I. Total vector momentum is conserved Il. KineticEnergy is conserved Ill. Total energy is conserved A. Ionly B. Il only C. IlII only D. I and Il E. I, II, and IlI

Explanation / Answer

18. conservation of energy - the total amount of energy is constant.

Ans(C)

19. from newton's 3rd law,

action - reaction have same magnitude but opposite direction.

Ans:(C) feels the same impulse as the other one .

20. net external force zero means momentum of system will not change.

Ans. (A) I only

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