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Eight equal drops of water are falling through air with a steady velocity of 10 cms^(-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» 20 cm/s `therefore4/3piR^(3)=8 4/3pir^(3)` `rArrR=2r` Since TERMINAL velocity, v`=2/(9eta).r^(2)[p-sigma]g` `rArrvpropr^(2)` `therefore` terminal velocity becomes 4 times as RADIUS becomes DOUBLE. `therefore` New terminal velocity `= 4 xx 10` = 40 emfs. Thus the CORRECT choice is (c). |
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