Q. For a ball falling in a liquid with constant velocity, ratio of the resistance force due to the liquid to that due to gravity is
A) 1
B) $\frac{2a^{2}\rho\ g}{9\ \eta^{2}}$
C) $\frac{2a^{2}(\rho - \sigma)g}{9\ \eta}$
D) None of these
Explanation
(a) When a body is falling in a liquid with a constant velocity, the viscous force acting upward is balanced by the effective weight of the body ($ie$ gravity pull on the body) acting downwards
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.