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Terminal velocity of a copper ball of ra...

Terminal velocity of a copper ball of radius 2 mm through a tank of oil at `20^(@)`C is 6.0 cm/s. Compare coefficient of viscosity of oil. Given `p_(cu) = 8.9 xx103 kg//m^(3), rho_(oil) = 1.5 xx 103 kg//m^(3)`.

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`nu_(t)=(2)/(9)[(g(sigma-rho)r^(2))/(eta)]`
`eta=(2)/(9)[(9.8xx(8.9xx10^(3)-1.5xx10^(3))(2xx10^(3))(2xx10^(-3))^(2))/(6xx10^(-2))]`
`=1.08kgm^(-1)s^(-1)`
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