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Q.

A large block of ice 5 m thick has a vertical hole drilled in it and is floating in a lake. the minimum length of the rope required to draw a bucketfull of water through the hole is (density of ice = 900 kg/m3)

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a

0.5 m

b

1 m

c

4 m

d

4.5 m

answer is A.

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Detailed Solution

mw = mlρwVw = ρ1V1ρwA.hw = ρ1Ah1103 x (5 - x) = 900 x 510 - 2x = 9; 2x = 1; x = 0.5m
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