Q.

A small sphere of radius‘r’ falls from rest in a viscous liquid. As a result, heat is produced due to viscous force. The rate of production of heat when the sphere attains its terminal velocity, is proportional to

Moderate

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By Expert Faculty of Sri Chaitanya

answer is 3.

(Detailed Solution Below)

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Detailed Solution

The viscous drag force, F=6πηrvwhere v= terminal velocity∴The rate of production of heat = power = force ×times terminal velocity⇒ Power =6πηrv·v=6πηrv2∵ Terminal velocity v=2r2(ρ-σ)g9η;∴ v∝r2 Now, power =6πηr4r4(ρ-σ)281η2g2 or Power ∝r5 .

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