Easy
$A$ small spherical body of radius $r$ and density $\rho$ moves with the terminal velocity $v$ in a fluid of coefficient of viscosity $\eta$ and density $\sigma$. What will be the net force on the body?
- A$\frac{4}{3} \pi r^{3}(\rho-\sigma) g$
- B$6 \pi \eta rv$
- CZero
- DInfinity
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