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A student weighing 300 N climbed a flight of stairs 5.0 m high in 6 s.How much work was done by the student?


A) 1500 J
B) 1800 J
C) 1500 W
D) 1800 W
E) 50 W

F) C) and E)
G) All of the above

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Car B is traveling twice as fast as car A,but car A has twice the mass of car B.Which car has the greater kinetic energy and by what factor is it greater?

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Car B,grea...

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A kilowatt-hour is a unit that measures


A) work per unit of time.
B) energy.
C) power.
D) work × time.

E) All of the above
F) A) and D)

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According to the law of conservation of energy,energy cannot be ______________ or ______________.

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Which of the following is a unit of power?


A) kilowatt-hour
B) newton
C) joules per second
D) foot-pound
E) none of these

F) C) and E)
G) A) and C)

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The potential energy of a pendulum is least


A) when its potential energy is greatest.
B) at the top of its swing.
C) at the bottom of its swing.
D) when its total energy is greatest.

E) A) and B)
F) A) and C)

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