1. Not finding help here? Sign up for a free 30min 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!

Rocket Momentum

  1. Oct 10, 2007 #1
    1. The problem statement, all variables and given/known data
    Far in space, where gravity is negligible, a 495 kg rocket traveling at 85.0 m/s fires its engines. The impulse imparted to the rocket is 15000Ns, for 30 seconds. What is the maximum velocity of the rocket?

    2. Relevant equations
    F(delta t)=mv2-mv1

    3. The attempt at a solution
    Why isn't this answer correct?
  2. jcsd
  3. Oct 10, 2007 #2


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    The impulse is given as 15000 Newton-seconds. you have incorrectly used this value as a force of 15000 newtons.
  4. Oct 10, 2007 #3

    D H

    Staff: Mentor

    Force has units of Newtons, not Newton-seconds. The impulse, 15000Ns, is not a force. The time duration has already been factored in.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Rocket Momentum
  1. Momentum rocket (Replies: 2)