Viscosity + Rotation combined
A cylindrical container of radius R has a cylindrical lid, with liquid filled up to height h. The fluid has a coefficient of viscosity. The lid has mass M and is rotated with angular velocity in clockwise sense as seen from top. At the same time a force F acts at a distance R/2 opposing the angular velocity.
Find the time after which the lid comes momentarily to rest.
If the answer is of formfind a+b+c