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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