jingenyu Posted August 22, 2009 Share Posted August 22, 2009 When an empty bottle is placed in the water, it will never be able to float upright. Why is this so? Link to comment Share on other sites More sharing options...
Fuzzwood Posted August 22, 2009 Share Posted August 22, 2009 Center of gravity lies above the water surface when the bottle is up-right. Try filling it 1/5 with water. It will prolly float upright now, or sink, in which case you need to pour some water out again. Link to comment Share on other sites More sharing options...
swansont Posted August 22, 2009 Share Posted August 22, 2009 If the glass were thick enough it would. Link to comment Share on other sites More sharing options...
J.C.MacSwell Posted August 23, 2009 Share Posted August 23, 2009 Unless you add ballast, which could be water or a weight, the shape is not stable. The righting arm from the changing center of buoyancy does not change fast enough, even at small angles of "heel", to counteract the "tipping moment" that is created. http://en.wikipedia.org/wiki/Metacentric_height Link to comment Share on other sites More sharing options...
hemantc007 Posted August 23, 2009 Share Posted August 23, 2009 (edited) Center of gravity lies above the water surface when the bottle is up-right. Try filling it 1/5 with water. It will prolly float upright now, or sink, in which case you need to pour some water out again. yes it seems to be logical answer, and explains it. Edited August 23, 2009 by hemantc007 Link to comment Share on other sites More sharing options...
J.C.MacSwell Posted August 23, 2009 Share Posted August 23, 2009 yes it seems to be logical answer, and explains it. It is not necessary (or even a guarantee of stability) for the center of buoyancy of an object to be above that of the center of gravity for it to be in a stable floating position. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now