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: Rocket Lab @ Angles.

  1. Oct 6, 2008 #1
    1. The problem statement, all variables and given/known data

    I need to predict how far a rocket will land given:

    Delta Y = 2.032 (80 in ) - Height it will be shot from.
    Angle - 35 (degrees)
    My Average velocity is 23.3 m/s.

    I need to repeat this for angles 40-60 [Increments of 5]

    2. Relevant equations

    I have these equations that i am using.

    Vy = V(average) x sin (theta)
    Vx = V(average) x cos (theta)
    X = V(average) x cos (theta) * Time
    T = (2*V(average))/ g

    3. The attempt at a solution

    For the first scenario i did the calculations and i am getting 55.3 m, but i know that is not right because we shot the rockets today, and mine did not even go past 40m. I did 3 trials, and each time it was between 20-40 m.
  2. jcsd
  3. Oct 6, 2008 #2


    User Avatar
    Homework Helper

    Maybe the 23m/s is not accurate?
  4. Oct 6, 2008 #3
    I believe that it is accurate because i compared these results with the same lab we did last year, and the answer is close.
  5. Oct 6, 2008 #4


    User Avatar
    Homework Helper

    Perhaps you would do better to use a range equation that was more of the form:

    [tex]Range = \frac{V_o^2*Sin2\theta}{g}[/tex]

    This of course does not take into account the height you launch it from.
  6. Oct 6, 2008 #5
    See, even with that equation, my answers comes in the 50's like my original.
  7. Oct 6, 2008 #6


    User Avatar
    Homework Helper

    Unfortunately it doesn't take into account how long the rocket burns. Since it is a rocket it will accelerate over a distance that may be greater than 2m.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook