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drgshahbaz1193
Joined: 26 Mar 2010
Posts: 18
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 Posted: Mon May 31, 2010 4:00 pm Post subject: Archimedes principal |
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| I have a problem understand the example of the ice cube that Dr. F gives in the 4th video. So the principal says that the bouyance force on a body immersed in a fluid is equal to the weight in volume of the fluid which is displaced. In my mind if the ice cube melts its weight changes (being less/force downward less) and therefore the water level raises. Plus the water level would rise because there is more water because some of the cube melted. The example doesn't really make sense to me, help! |
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mcat_premed3832
Joined: 19 Oct 2006
Posts: 413
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| Posted: Mon May 31, 2010 7:45 pm Post subject: |
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| Quote: | | In my mind if the ice cube melts its weight changes |
If you put ONLY an ice cube in a beaker and then put the beaker on a measuring scale. As you watched the ice cube melt, would the scale change? Definitely not! The number of water molecules did not change so there will be no change in weight. Only the form changes.
Because the force does not change, the molecules have no greater nor less ability to "push" surrounding molecules away. |
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