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Two rain drops reach the earth with different terminal velocities having ratio `9:4` . Then , the ratio of their volumes isA. `3:4`B. `4:9`C. `9:4`D. `27:8` |
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Answer» (d) Terminal velcoity,`V_(T)oor^(2)` or `(V_(T1))/(v_(T2))=(r_(1)^(2))/(r_(2)^(2))` `thereforesqrt((9)/(4))=(r_(2))/(r_(2))or(r_(1))/(r_(2))=(3)/(2)` `thereforeV=(4)/(3)pir^(3)or (V_(1))/(V_(2))=(r_(1))/(r_(2)^(3))=(27)/(8)` |
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