1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Space 10.17

  1. Jun 2, 2006 #1
    Suppose you were kidnapped and held prisoner by space invaders in a completely isolated room, with nothing but a watch and a pair of shoes (including shoelaces of known length). Explain how you might determine whether this room is on earth or on the moon.
    Last edited: Jun 2, 2006
  2. jcsd
  3. Jun 2, 2006 #2


    User Avatar
    Gold Member

    Personally, I'd just determine whether or not I seemed to be at my normal weight. Is this homework?
  4. Jun 2, 2006 #3
    just something a teacher asked us to think about and discuss tomorrow.
  5. Jun 2, 2006 #4


    User Avatar
    Gold Member

    There are lots of ways that you could do it, such as dropping the shoe and timing its fall with the watch (if it's accurate enough). Gravitational acceleration will obviously be different. I get the impression, though, from the specific mention of shoelaces, that your teacher is looking for a pendulum whose oscillations you can time.
  6. Jun 2, 2006 #5
    Either measure a set height above the ground, drop your shoes and time the time taken to hit the ground (then use equations of motion to find gravity) or do as Danger suggests and make a pendulum and use oscillation equations to find gravity.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Space 10.17
  1. Spacing needed? (Replies: 5)

  2. Space Mechanics (Replies: 7)

  3. Forces in space (Replies: 10)

  4. Satellite in space (Replies: 3)

  5. Motion in Space (Replies: 1)