a metre scale of mass 400 grams is lying horizontally on the floor if it is to be held vertically with one end touching the floor the work done to be done is
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Answer: 2J
Explanation:
Initially, the scale is lying on zero potential line. Thus initial potential line
U
i
=
0
Mass of the meter scale
m
=
400
g
=
0.4
k
g
Center of mass of the scale lies at its center i.e.
h
=
0.5
m
Final potential energy of the scale
U
f
=
m
g
h
∴
U
f
=
0.4
×
10
×
0.5
=
2
J
Work done
W
=
U
f
−
U
i
∴
W
=
2
−
0
=
2
J
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