- #36
LowlyPion
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DaveC426913 said:PLEASE READ THE CRITERIA BEFORE CONTINUALLY OFFERING INVALID RESPONSES.
- both are covered with a black paint that is anti reflective, heat/electricity insulator.
- You can't use any measurement device,
- nor hitting, damaging or breaking the ball
Ohhh. So grumpy.
DaveC426913 said:It is detection with a device. There is a naked eye obvious way of telling the difference, (if you know what do with the ball)...
I still think a magnet is not a measuring device if you are testing merely for a qualitative property of the material. The paint mentioned in the OP is not magnetically reflective after all.
But that said I'd say you can also exploit the difference in the moment of inertia. A shell ball will have a higher moment than a solid ball. You can spin them and the gold ball will either spin slower for the same torque or longer if you get them spinning at the same speed. There's about a 50% difference in the moments.