Mechanics

Hot goIITian

Joined: 14 Sep 2009
Post: 154
17 Mar 2012 15:28:54 IST
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A cylindrical container of length L is full of a liquid which has mass density ?. It is pl
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A cylindrical container of length L is full of a liquid which has mass density ρ. It is placed on a weigh-scale; the scale reading is W. A ball which would float on the liquid if allowed to do so, of volume V and mass m is pushed gently down and held beneath the surface of the liquid with a rigid rod of negligible volume as shown.

What is the reading of the scale when the ball is fully immersed?

A)     W+ρVg

B)      W

C)      W+mg-ρVg

D)     None of these

 



Comments (4)


New kid on the Block

Joined: 17 Mar 2012
Posts: 5
17 Mar 2012 17:02:33 IST
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 since the ball can float on liquid, force of buoyancy acts equally all the areas so the weight remains unchanged.


New kid on the Block

Joined: 17 Mar 2012
Posts: 5
17 Mar 2012 17:04:38 IST
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 is it the right answer ?


Hot goIITian

Joined: 14 Sep 2009
Posts: 154
24 Mar 2012 17:05:57 IST
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answer is correct but i didnt get your point. please explain.

Blazing goIITian

Joined: 19 Mar 2012
Posts: 421
24 Mar 2012 17:20:16 IST
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AS THE BALL FLOATS , SO WEIGHT OF THE BALL = BUOYANT FORCE . SO THE TOTAL UPWARDS AND DOWNWARD FORCES ACTING ON THE CONTAINER REMAINS THE SAME OR UNCHANGED.



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