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Questions  

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)

a
0.5 m
b
1 m
c
4 m
d
4.5 m

detailed solution

Correct option is A

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

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Consider the following statements.
(A) A thin stainless steel needle can lay floating on a still water surface. 
(B) Any object floats when the buoyancy force balances the weight of the object. 

Select the correct option.
(a) (A) is false, But (B) is true.
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(d) Both (A) and (B) are false.


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