Question

if the body is non homogeneous, then the body rotates in the fluid, why?​

Answer 1

Answer:

Rigid body rotation occurs when a fluid is rotated without relative motion of fluid particles. This is the case, for example, of a fluid placed in a cylindrical container on top of a turntable rotating with a constant angular velocity, Ω0. After some time elapses, a steady state is achieved, in which the tangential velocity varies linearly with radial distance, r, while both the radial and axial components of the velocity vector vanish