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  • Two copper balls of radius and 2 v are released at rest in a long tube filled with liquid of uniform viscosity. After some time when both the spher

Two copper balls of radius \gamma and 2 v are released at rest in a long tube filled with liquid of uniform viscosity. After some time when both the spheres acquire critical velocity (terminal velocity) than ratio of viscous force on the balls is :
 

Option: 1

1 : 2


Option: 2

1 : 4


Option: 3

1 : 8

 


Option: 4

1 : 18


Answers (1)

best_answer

f_{B}+F_{v}= mg

F_{v}= mg-f_{B}= \frac{4}{3}\pi r^{3}(3_{n}-\delta )g

\frac{(F_{v})_{1}}{(F_{v})_{2}}= \frac{r{_{1}}^{3}}{r{_{2}}^{3}}= \frac{r^{3}}{Br^{3}}= \frac{1}{8}

Posted by

sudhir.kumar

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