Fluid MechanicsMedium
Question
A sphere is dropped into a viscous liquid of viscosity η from some height. If the density of material and liquid are ρ and σ respectively (ρ > σ) then which of the following is/are incorrect.
Options
A.The acceleration of the sphere just after entering the liquid is 
B.Time taken to attain terminal speed t ∝ r0
C.At terminal speed, the viscous force is maximum
D.At terminal speed, the net force acting on the sphere is zero
Solution
Acceleration will be less than Time will depend on density ρ. Viscous force may be maximum or minimum both are possible
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