Question

The viscous force acting on a rain drop of radius 0.35 mm falling through air with a velocity of 1 m/s, is $\text{1 km}/{{\text{s}}^{\text{2}}}$

• A. $\text{1}00\text{ m}/{{\text{s}}^{\text{2}}}$
• B. $\text{1}0\text{ m}/{{\text{s}}^{\text{2}}}$
• C. $\text{1}\,\text{m}/{{\text{s}}^{\text{2}}}$
• D. $\sqrt{98}m/s$

Answer 1

Answer: (D)

$\sqrt{98}m/s$

Answer 2

From the formula the viscous force is given by ${{\upsilon }_{B}}$ ${{\upsilon }_{A}}:{{\upsilon }_{B}}$ $\sqrt{3}:1$