Before you are two balls, one solid and one hollow. They are to all appearences completely identical: same size, same weight, same outer material (though one might assume, correctly, that the hollow ball would need a higher-density material on the inside to make it the same weight).

Without breaking either of the balls, how can you easily determine which is hollow?

Assume that the material is solid enough that a hitting the side of the hollow ball will not result in any noticeable echo or vibrations.

(In reply to If you don't have a ramp available by Hugo)

Didn't Schrodinger try this with theoretical cats, only he designed it so that the hollow ball contained a radioactive atom that may or may not have decayed and kill the cat while at the same time the cat may or may not have landed on its feet?

Posted by Jer on 2005-03-25 17:07:36