A sphere is dropped into a viscous liquid of viscosity eta from some height if the density of material and liquid are rho and sigma respectively (rhogtsigma) then which of the following is/are incorrect. (a). The acceleration of the sphere just after entering the liquid is g((rho-sigma)/(rho)) (b). Time taken to attain terminal speed tproprho^(0) (d). At terminal speed, the net force acting on the sphere is zero.

A sphere is dropped into a viscous liquid of viscosity eta from some h

1.	A sphere is dropped into a viscous liquid of viscosity eta from some height if the density of material and liquid are rho and sigma respectively (rhogtsigma) then which of the following is/are incorrect. (a). The acceleration of the sphere just after entering the liquid is g((rho-sigma)/(rho)) (b). Time taken to attain terminal speed tproprho^(0) (d). At terminal speed, the net force acting on the sphere is zero.
Answer» SOLUTION : Acceleration will LESS than `g((RHO-sigma)/(rho))` time will depend on density `rho`. Viscous FORCE MAY be maximum or minimum both are possible