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!

Major Help Required

  1. May 19, 2006 #1
    Question on Kinetic and potentail energy!

    I need some major help on the physics question below. I need help quit quickly. I'm sorry if this thread is in the wrong section, but i don't think i have ever seen anything like this before. This is the question:

    The Speed of the rocket shown, of mass 20 000kg, has to be increased by 5.0 m/s Squared. If it burns 10kg of fuel and oxygen in doing this, what is the speed of the exhaust gases produced?

    The diagram of the rocket is irrelivent

    I need someone to please explain how to work it out? I just can't figure it out.

    Last edited: May 19, 2006
  2. jcsd
  3. May 19, 2006 #2


    User Avatar
    Homework Helper

    "has to be increased by 5.0 m/s Squared"

    What does this mean?
  4. May 19, 2006 #3


    User Avatar

    Staff: Mentor

    Yeah, speed can't be increased by 5m/s^2. Maybe 5m/s? Or is the acceleration 5m/s^s for some amount of time delta-t?
  5. May 19, 2006 #4
    If it's 5 m/s, it's just conservation of momentum:

    20,000 kg * (5 m/s) = 10 kg * v

    So v = 20,000 / 10 * 5 m/s = 10,000 m/s.
  6. May 20, 2006 #5
    From the given above, I agree that we need to use the equation in conservation of momentum.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Major Help Required
  1. Help required (Replies: 1)

  2. Major help (Replies: 1)