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Question

A hollow cylinder of mass m made heavy at its bottom is floating vertically in water. It is tilted from its vertical position through an angle and is left. The restoring force acting on it is


A

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B

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C

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D

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Solution

The correct option is C


l = length of cylinder

A = Area of crossection of cylinder

mg = (A) (l) (ρ) (g)

m = Alρ

When cylinder is tilted through an angle

length of cylinder in water = 1cos θ

wt of water displaced = lcos θA ρ g

restoring force = lAρgcos θlAρg

= lAρg(1cos θ1)=mg(1cos θ1)


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