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  1. What kind of effect would the speed of the sand leaving the glass have on the way it moves? Like would the decrease in mass change anything?

  2. Couldn’t you use this to calculate the rotation of the earth? I thought I read that in the “stick in the mud physics” chapter of death by black hole.

  3. OK, someone please explain why the pendulum moves the way it did. Someone has to be controlling it right?

    How does it gain and lose momentum in different directions?

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