Question

A small spherical body of radius r and density  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. $\frac{4\pi }{3}{r}^3\left(\rho -\sigma \right)g$
• B. $6\pi \eta rv$
• C. Zero
• D. Infinity

Answer 1

Answer: (C)

$V_{terminal}\Rightarrow F_{net}=0$