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A small metal ball of diameter 4 mm and ...

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 is

A

4.9 poise

B

9.8 poise

C

98 posie

D

980 posie

Text Solution

Verified by Experts

The correct Answer is:
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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