Answer :

(a) 1.5 × 10-4 N

(b) 5.2 × 10-5 N


(c) 2.9 cm s-1


Given, radius of sphere,


Mass of the sphere,


Coefficient of viscosity,


Velocity,


(a)Therefore, viscous force is given by,



(b)The hydrostatic force is equal to the buoyant force of the glycerin which will have the same volume as that of the sphere immersed.


Hence, Force,



(c) Let the terminal velocity be v.


The viscous force,


The upwards force is due to the buoyant force in glycerin.



and the weight downwards,


Hence, as per situation, there should be no acceleration downwards.





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