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httpsé bbprod stjohns.edu.bbcswebdav/pid-1 de-content-rid-9223659 1/courses/scI-10000 Blog 48 ENG 11 18. The law of conservation of energy is a statement that A. Energy must be conserved and you are breaking a law if 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 otherone B. Feels a smallerimpulse than the otherone C. Feels the same impulse as the other one D. It depends on the time of the collision E. It doesn't experience any impulse 20. In an inelasticcollision 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 III. Total energy is conserved 0Explanation / Answer
Q 18.
(C) total amount of energy is constant.
law conservation of energy states that total energy of an isolated system remains conserved.
Q 19
(C) feels same impulse as the other,
since momentum of system is conserved.
Q 20
I. kinetic energy is conserved.
II. total energy is conserved
in an inelastic collision linear moment remains conserved as no external force acts on the system,
by defination if in a collision final kinetic energy doesnot equals to inital kinetic energy of system its called inelastic collision.this kinetic energy losses in the form of heat.
here by saying tatal energy of system we means total mechanical energy of the system, which will not be conserved ,
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