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Physics
Raindrops falling down attain limited value of velocity because of
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Q. Raindrops falling down attain limited value of velocity because of
COMEDK
COMEDK 2010
Mechanical Properties of Fluids
A
surface tension effects
18%
B
air currents in atmosphere
14%
C
viscous forces exerted by air
56%
D
upthrust of air
12%
Solution:
When raindrop moves downward through air, an upward drag (viscous) force acts on it. This force depends on velocity of the raindrop. After certain time, this force becomes equal to the weight of the raindrop and it falls with constant velocity.