Question

A spherical water drop of radius r is falling with
the terminal velocity. Assume that the entire
work done against viscous force is dissipated in
the form of heat. The rate of heat produced will
be proportional to
a.
${r}^{2}$
b.
${r}^{3}$
c.
${r}^{5}$

Answer 1

A) r^2
hope it is true ..