Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Momentum in Space

  1. Oct 28, 2008 #1


    User Avatar

    1. A 90 kg astronaut floating out in space is carrying a 1.0 kg TV camera and a 10 kg battery pack. He's drifting toward his ship but, in order to get back faster, he hurls the camera out into space (away from the space ship) at 19 m/s and then throws the battery at 14 m/s in the same direction. What's the resulting increase in his speed after each throw?

    After throwing the camera?
    After throwing the battery?

    2. I believe this equation is used: (M1+M2)Vi=M1 V1f + M2 V2f

    3. I am having difficulty assigning values to Vi, V1f and V2f. Am I on the right track?
  2. jcsd
  3. Oct 28, 2008 #2


    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    You're on the right track. You don't actually assign values to the velocities.

    What is V2f in terms of Vi?
  4. Oct 28, 2008 #3


    User Avatar

    I got it. Thanks.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook