Section: Fluid Mechanics | Marks: 2
A cube of weight W and side a falls at a constant speed in a medium as shown in the figure. If the medium is air (mass density =𝜌𝜌air ) let air U be the velocity of the cube. If the medium is water (mass density =𝜌𝜌water ) let water U be the velocity of the cube. Neglecting the buoyancy force and assuming drag coefficient to be same for both cases, the ratio of velocities, air water U U is given by
- A. air water ρ ρ
- B. air water ρ ρ
- C. water air ρ ρ
- D. 1 δ 1 1 2 2 U U ( ) u y x y a W XE (GATE 2014)
Answer: C. water air ρ ρ