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 bucket full 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

mg=vρlg ALρb=Ahρl h=Lρbρl=5×9001000=4.5 min. length of rope=L-h=5-4.5=0.5m
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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 bucket full of water through the hole is (density of ice =900 kg/m3 )