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!

Homework Help: Energy conservation answer check

  1. Apr 3, 2009 #1
    1. The problem statement, all variables and given/known data

    A 1500kg rocket is to be launched with an initial upward velocity of 50m/s. In order to assist its engines, engineers will start it from rest on a ramp that rises 53 degrees from the horizontal. At the bottom, the ramp turns upward and launches the rocket vertically. The engines provide a constant forward thrust of 2000 N, and friction with the ramp is a constant 500 N. How far from the base of the ramp should the rocket start, as measured along the surface of the ramp?

    2. Relevant equations

    E0 +Win = Ef + Elost
    U = mgh
    KE = 1/2 m v2

    3. The attempt at a solution

    I need to find the displacement along the ramp. I made the change in x the surface of the ramp, and I made h equal x*sin 53.

    Solving for x, I got 141.6m.
  2. jcsd
  3. Apr 3, 2009 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Looks good.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook