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)

Zero

Answer 2

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