Work, Power and Energy
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Question : 10
Total: 30
A body is moving unidirectionally under the influence of a source of constant power. Its displacement in time t is proportional to
(a)t
(b)t
(c)t
(d)t
(a)
(b)
(c)
(d)
Solution:
As power, P = force × velocity
∴P = [ M L T – 2 ] [ L T – 1 ] = [ M L 2 T – 3 ]
AsP = [ M L 2 T – 3 ] =
∴ L 2 T − 3 =
= constant
∴ L 2 ∝ T 3 L ∝ T
∴
As
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