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Projectile motion with two angles

  1. Oct 16, 2011 #1
    First, I struggled with whether to put this in advanced or intro physics. I read the sticky, and since this is a 300 level class that is taken at the junior level in the physics BS program at my school, I put it here. If it's considered too simplistic for advanced physics, I apologize.

    I've attempted a solution and come up with something painfully close to the desired result, and I have no idea where I'm going wrong. I would really appreciate some insight.


    1. The problem statement, all variables and given/known data
    http://usera.imagecave.com/hotrod73dart/homework/4.8.jpg


    3. The attempt at a solution
    http://usera.imagecave.com/hotrod73dart/homework/4.8attempted.jpg
     
  2. jcsd
  3. Oct 17, 2011 #2

    Filip Larsen

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    Gold Member

    Your answer fits if you define "elevation" as being measured from horizontal and not from the slope as you have done it.
     
  4. Oct 17, 2011 #3
    Oh gods! How stupid of me! My angle should be [itex]\alpha[/itex] - [itex]\phi[/itex], not just [itex]\alpha[/itex]. That makes my derived answer sin([itex]\alpha[/itex]-[itex]\phi[/itex])*cos([itex]\alpha[/itex]-[itex]\phi[/itex]+[itex]\phi[/itex]) = cos([itex]\alpha[/itex])*sin([itex]\alpha[/itex]-[itex]\phi[/itex]) which is, of course, the desired result. I should sleep more. Thanks for the reply!
     
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