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Question

A metal sphere of diameter 7cm falls through a liquid of coefficient of viscosity 0.8Pa.s. When its velocity is 20cm.s1 the viscous force acting on it is nearly ----N.

A
0.11
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B
0.22
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C
0.3
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D
0.01
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Solution

The correct option is A 0.11
Viscous force on the metal sphere = 6πηrV
=6××0.8×3.5100×43π(3.5100)3×20100N
=0.10550.11N

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