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A small metal ball of diameter `4 mm` and density `10.5 g//cm^(3)` in dropped in glycerine of density `1.5 g//cm^(3)`. The ball attains a terminal velocity of `8cm s^(-1)`. The coefficient of viscosity of glycerine isA. 4.9 poiseB. 9.8 poiseC. 98 posieD. 980 posie |
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Answer» Correct Answer - 2 `V_(T)= (2)/(9)(r^(2)g)/(eta) (rho_(s) - rho_(L))` `rArr eta =(2r^(2)g)/(9v)(rho_(s)- rho_(L))` `=(2 xx0.2xx0.2xx9xx980)/(9xx8)` `=9.8 ` poise. |
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