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A small metal sphere of radius a is falling with a velocity `upsilon` through a vertical column of a viscous liquid. If the coefficient of viscosity of the liquid is `eta`, then the sphere encounters an opposing force ofA. `6 pi eta a^(2)upsilon`B. `(6eta upsilon)/(pia)`C. `6pi eta a upsilon`D. `(pi eta upsilon)/(6a^(3))` |
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Answer» Correct Answer - C Stock estbalished that if a sphere of radius a moves with velocity v through a fluid of viscosity n, the the viscous force opposing the motion of the sphere if `F=6pieta av` |
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