Five cool physics tricks, but how do they work?

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1. DrFred says:

   19/11/2014 at 13:39

   1. Always at the Center of mass if you are poised, torque summary.2. Has the mechanisms that make the rotation measurements etc that you may always change your center of gravity but again the mobile is not omogenws distributed weight, elsewhere it is more lightweight, Elsewhere heavier and difficult to achieve the center of gravity on the symmetry axis in 3 dimensions.3. The water practically does not participate but do not drink distilled/purified water, has ions and these are drawn by the magnet.4. Cereals definitely have iron and I don't know what else5. Vacuum created due to combustion at the top of the paper.

   

   

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