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Up or down or... (Posted on 2005-07-22) Difficulty: 3 of 5
A jar filled partially with water has an object floating in it. The jar is open. Now, if the jar is closed and a vacuum pump is used to pump the air out, what will happen to the floating object? will it rise up more or sink or ...? and why?

No Solution Yet Submitted by nilshady    
Rating: 2.3333 (3 votes)

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re: depends on density | Comment 12 of 20 |
(In reply to depends on density by Larry)

Ok,

My only comment is that no air is being displaced below the object, only above and to the sides (and the forces exerted around the sides cancel out). Hence the buoyancy force of air is actually acting DOWNWARDS. Thus, with the weight (mainly) and buoyancy force (negligible) of air removed the object must rise.
  Posted by Mark Sales on 2005-08-04 19:52:37

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