A small metal ball of diameter 4 mm and density 10.5 g/cm3 in dropped in glycerine of density 1.5 g/cm3. The ball attains a terminal velocity of 8/cm s-1. The coefficient of viscosity of glycerine is
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a
4.9 poise
b
9.8 poise
c
98 poise
d
980 poise
answer is B.
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Detailed Solution
v0=29r2ρ−ρ′gη or η=2r2ρ−ρ′g9v0=2×0.2×0.2×9×9809×8 poise =9.8 poise
A small metal ball of diameter 4 mm and density 10.5 g/cm3 in dropped in glycerine of density 1.5 g/cm3. The ball attains a terminal velocity of 8/cm s-1. The coefficient of viscosity of glycerine is