A small metal sphere falls down in a liquid with terminal velocity when the viscous force on it and its weight are in the ratio 2:5. Then the density of the sphere is
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a
Equal to that of the liquid
b
1.66 times that of the liquid
c
2.5 times to that of the liquid
d
3 times that of the liquid
answer is B.
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Detailed Solution
condition for terminal velocity W= Fb+Fv here buoyant force Fb= W-Fv so Fb= 5F-2F =3F W= Vdsg =5F and Fb=Vdlg=3F ds=53dl