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Homework Help: Gas cylinders in space

  1. Oct 4, 2011 #1
    What are 5 ways to determine which of 2 identical cylinders is empty and which is full of gas if they are in space?
  2. jcsd
  3. Oct 4, 2011 #2


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    Gold Member

    What do you think?

    We can't give you answers. You know this because you agreed to the rules when you signed up.

  4. Oct 4, 2011 #3
    I don't want answers, just to be pointed in the right direction...

    I think I found 2 ways.

    To apply a force to each cylinder to measure the velocity and find the acceleration. Divide force by acceleration.

    Use a small centrifuge and determine rpm and ''radius''. Using a=v2/r, find acceleration. f/a=m

    Any other ideas?
  5. Oct 5, 2011 #4
    I also found:
    If there is another object nearby, the time the cylinders take to orbit that object can be used to determine mass. (Kepler's law of planetary motion)

    Use a spring to measure a pulling force on each cylinder and use Newton's second law
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