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Re: [Phys-l] Linear Air Drag



These look like great density experiment objects and McMaster-Carr carries 'em ! !


> Where does one find these hollow ball bearings??

Sad to tell, like every other kind of industrial product, from China....

<http://www.alibaba.com/product/oldsea-11390825-10903528/Hollow_Ball_Hollow_Steel_Ball_Hollow_Stainless_Steel_Ball.html>