Question:
If a ball of steel (density $\rho=7.8 \mathrm{~g} \mathrm{~cm}^{-3}$ ) attains a terminal velocity of $10 \mathrm{~cm} \mathrm{~s}^{-1}$ when falling in a tank of water (coefficient of viscosity $\eta_{\text {water }}=8.5 \times 10^{-4} \mathrm{~Pa}$.s) then its terminal velocity in glycerine ( $\rho=1.2 \mathrm{~g} \mathrm{~cm}^{-3}, \eta=13.2$ Pa.s) would be nearly :-
Correct Option: , 2
Solution:
