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Eight equal drops of water are falling through air with a stready velocity of 10 cm s^(-1). If the drops combine to form a single drop big in size, then the terminal velocity of this big drop is : |
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Answer» 40 cm `s^(-1)` `rArrvpropr^(2)` When 8 DROPS COMBINE to form a single drop then `rArrR=2r` `therefore(v_(2))/(v_(1))=(R^(2))/(r^(2))` `(v_(2))/(v_(1))=(4R^(2))/(r^(2))=4` `v_(2)=4v_(1)rArrv_(1)=4xx10=40` cm/s So correct choice is (a). |
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