Question

If the terminal speed of a sphere of gold (density `=19.5kg//m^3`) is `0.2m//s` in a viscous liquid (density `=1.5kg//m^3`), find the terminal speed of a sphere of silver (density `=10.5kg//m^3`) of the same size in the same liquid
A. (a) `0.4m//s`
B. (b) `0.133m//s`
C. (c) `0.1m//s`
D. (d) `0.2m//s`

Answer 1

Correct Answer - C
Terminal velocity, `v_T=(2r^2(d_1-d_2)g)/(9eta)`
`(v_(T_2))/(0.2)=(10.5-1.5)/(19.5-1.5)impliesv_(T_2)=0.2xx9/18=0.1m//s`