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Physics
Physics
Problem
1 An object of mass
m
m
m
is lifted at constant velocity a vertical distance
H
H
H
in time
T
T
T
. The power supplied by the lifting force is (A) mgHT (B)
m
g
H
/
T
\mathrm{mgH} / \mathrm{T}
mgH
/
T
(C)
m
g
/
H
T
\mathrm{mg} / \mathrm{HT}
mg
/
HT
(D)
m
g
T
/
H
\mathrm{mgT} / \mathrm{H}
mgT
/
H
(E) zero (A) mgHT (B)
m
g
H
/
T
\mathrm{mgH} / \mathrm{T}
mgH
/
T
(C)
m
g
/
H
T
\mathrm{mg} / \mathrm{HT}
mg
/
HT
(D)
m
g
T
/
H
\mathrm{mgT} / \mathrm{H}
mgT
/
H
(E) zero
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