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Eight spherical rain drops of the same mass and radius are falling down with a terminal speed of `6cms^(-1)`. If they coalesce to form one big drop, what will be its terminal speed? Neglect the buoyancy due to airA. `1.5 cms^(-1)`B. `6 cms^(-1)`C. `24 cms^(-1)`D. `32 cms^(-1)` |
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Answer» Correct Answer - C Equanting the volume, we have `8((4)/(3) pir^(3))=(4)/(3) piR^(3)` or, `R=2r` `v_(T )prop (radius^(2))` Radius has become two times. Therefore, terminal velocity will become 4 times. |
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