Physics
Work and Energy
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#17 For constant power, work done in time $t$ is:
A) $W=Pt$
B) $W=P/t$
C) $W=P^2t$
D) $W=\sqrt{Pt}$
Answer: A
#18 Instantaneous power by a force:
A) $P=\vec F\cdot\vec v$
B) $P=\vec F\cdot\vec s$
C) $P=F/v$
D) $P=F^2 v$
Answer: A
#19 Dimensions of work (energy) are:
A) $ML^2T^{-2}$
B) $MLT^{-2}$
C) $M^0LT^{-1}$
D) $ML^2T^{-1}$
Answer: A
#20 Which has units $\text{J s}^{-1}$?
A) power
B) work
C) impulse
D) pressure
Answer: A
#21 Work done by gravity depends on:
A) initial & final heights only
B) path length
C) speed
D) mass density
Answer: A
#22 Area under $F$–$x$ graph gives:
A) work
B) power
C) momentum
D) pressure
Answer: A
#23 If $\vec F=0$, then:
A) work is zero
B) power is nonzero
C) work may be nonzero
D) energy increases
Answer: A
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