engineering recuitment BARC Stipendiary Trainee Category I 2023 Mock Test Physics Fluids Viscosity

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

1
r3
2
r2
3
r4
4
r5
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