Outer space question

  1. 1. The problem statement, all variables and given/known data
    A 63 kg astronaut at rest in space throws a 10 kg oxygen tank with a speed of 12 m/s. What is the velocity of the astronaut immediately after throwing the tank?

    Which formula would I use to solve this? Thanks in advance.
  2. jcsd
  3. nrqed

    nrqed 3,101
    Science Advisor
    Homework Helper
    Gold Member

    Conservation of momentum. Here, the total momentum before was zero. so th etotal momentum after will be zero.
  4. Yes, thats what i was thinking. thanks again.
  5. Is the answer 1.9 m/s?
  6. I get .........120/63.
  7. oh really?:rolleyes:

    actually, its -1.9 m/s because the astronaut goes backwards.
    Last edited: Apr 27, 2007
  8. cristo

    cristo 8,387
    Staff Emeritus
    Science Advisor

    I think you may mean -1.9m/s
  9. Haha, yeah ill change it.
  10. Yes, and I actually chose the sign convention as such. Good lord trying to be helpful. And you'll notice, the question states the problems in terms of speed and asks for velocity. Either answer is correct.
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