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  • this man is a genius.

  • it's amazing how he draws the dot lines..........!!

  • @ 40:22 As the Pendulum is falling back to earth in the shuttle, it is in theory; already swinging, the period is the time it takes to do one orbit and the altitude is the "length of string". it's mass will eventually hit the earth, therefore it is not and will not sit there forever.

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