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where can I get the feather coin experiment ? Answered

Tags:galileo

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I think you might be referring to a demonstration that takes place in an evacuated tube to show that gravitational acceleration does not depend on weight.

Creating a good vacuum cheaply is not easy, but possible:
But instead of trying to create a vacuum, why not just control for the effects of air resistance? Drop a tennis ball from the top of a building, once empty, and another time filled with pennies.