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Phantastic Physics Demos: The Blow Out Challenge

A great proof of Bernoulli's principle is to challenge someone to blow a Styrofoam ball out of a funnel.  The top of a 2 liter soda bottle makes a perfect funnel and the ball should be between 4 and 6cm in diameter.  As a result of Bernoulli's principle, the challenge proves to be close to impossible.  A video of someone taking the challenge is shown below...

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