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Question
A rain drop of mass 0.1gram falls vertically at constant speed under the influence of the forces of gravity and viscous drag. In falling through 100m, the work done by gravity is (Take g=9.8 m/s2):
A rain drop of mass 0.1gram falls vertically at constant speed under the influence of the forces of gravity and viscous drag. In falling through 100m, the work done by gravity is (Take g=9.8 m/s2):
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Solution
The correct option is A 0.098J
W.D by gravity =−ΔPE
=−mg(−100)
=100×110×9.8×10−3
=0.098J
W.D by gravity =−ΔPE
=−mg(−100)
=100×110×9.8×10−3
=0.098J
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