agreed. see my edit
Would that mean any momentum would keep going? So if it had a slight spin it would keep spinning? Or would the torsion of the string/wire prevent it from spinning too far, and ultimately settle in the middle?
unfortunately, you are correct. the string would prevent it from going forever. also, even though it is in a vacuum, it is probably not that high of pressure even without the string.
here are the materials needed
Found this: https://www.quora.com/Has-the-Cavendish-experiment-ever-been-done-in-a-vacuum
What's up with this: "Torsion balance mounted inside of vacuum chamber an a vibration damping table (not shown)"
Not shown lol...where is it??
I thought this was as easy as me jumping off a building. Haha
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