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Physics
Physics
Problem
Which of the following expressions gives the power developed when a crane raises a load of mass
m
m
m
through a height
h
h
h
in time
t
t
t
at constant speed? a)
m
g
h
2
t
\dfrac{mgh}{2t}
2
t
m
g
h
b)
3
m
g
h
2
t
\dfrac{3mgh}{2t}
2
t
3
m
g
h
c)
m
g
h
t
\dfrac{mgh}{t}
t
m
g
h
d)
2
m
g
h
t
\dfrac{2mgh}{t}
t
2
m
g
h
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