How much potential energy (or height) a ball must have to run a full loop
[full video by TSG Physics: buff.ly/2r8Jfba]
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and against gravity
ie newatom newelectron declinates why gravity pulls
andwhy towards center and why it decreases deeper into underground tunnels
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11 meters per second: What is the average air speed velocity of a laden swallow?
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You Tube search for Tony Hawk doing a spiral. It's excellent. So much harder than it looks!
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