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: Projectile proof

  1. Oct 20, 2007 #1
    1. The problem statement, all variables and given/known data
    Prove that a gun will shoot three times as high wehn its angle of elevation is 60deg as when it is 30deg but will carry the same horizontal distance.



    2. Relevant equations
    s=(Vo +Vf)/2 * t
    x=Vo*costheta *t

    3. The attempt at a solution

    AFter simplifying the equation i get:

    y=0.25tan30x
    y=0.25tan60x

    is this correct?
     
  2. jcsd
  3. Oct 21, 2007 #2

    learningphysics

    User Avatar
    Homework Helper

    The equations are right but you haven't shown that the range of the two angles are the same... or the height at 60 is 3 times the height at 30.

    you've related the range to the height for each situation... but you haven't related range to range.. and height to height.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook