Q.

A streamlined body falls through air from a height h on the surface of a liquid. If d and D (> d) represent the densities of the material of the body and liquid respectively, then thetime after which the body will be instantaneously at rest, is:

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a

2hg

b

2hgDd

c

2hgDd

d

2hgdD-d

answer is D.

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Detailed Solution

When body enter in water then velocity =2ghRetardation on body =a=Th-Wm=gD-ddTime at which the body will be at restt=va=2ghgD-dd=2hgdD-d
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A streamlined body falls through air from a height h on the surface of a liquid. If d and D (> d) represent the densities of the material of the body and liquid respectively, then thetime after which the body will be instantaneously at rest, is: