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  • A rain drop of radious 0.3 mm falling vertically downwards ie air has a terminal velocity of 1 m/s. The viscosity of air is <img alt="18 \times 10^{-5}" src="/latex-image/?18%20%5Ctimes%2010%5E%7B-

A rain drop of radious 0.3 mm falling vertically downwards ie air has a terminal velocity of 1 m/s. The viscosity of air is 18 \times 10^{-5} poise. The viscous force on the drop is
 

Option: 1

101.73 \times 10^{-4}\text {dyne}

 

 

 


Option: 2

101.73 \times 10^{-5}\text {dyne}


Option: 3

16.95 \times 10^{-5}\text {dyne}


Option: 4

16.95 \times 10^{-4}\text {dyne}


Answers (1)

best_answer

Viscous force= 6\pi \eta \gamma v= 6\pi \times18\times10^{-5}\times 0.03 cm \times100\frac{cm}{5}

                     = 101.73 \times 10^{-4} \text {dyne}

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Pankaj

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