A container filled with viscous liquid is moving vertically downwards with constant speed `3v_0`. At
Channel: Doubtnut
Date: 19/01/2020

A container filled with viscous liquid is moving vertically downwards with constant speed `3v_0`. At the instant shown, a sphere of radius `r` is moving vertically downwards (in liquid) has speed `v_0`. The coefficient of viscosity is `eta`. There is no relative motion between the liquid and the container. Then at the shoen instant, The magnitude of viscous force acting on sphere is