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Homework Help: Projectile Motion E

  1. Jul 29, 2011 #1
    Projectile Motion Question

    1. The problem statement, all variables and given/known data
    A cannon fires a projectile

    Velocity = 40 m/s
    The angle of the cannon= 35 degrees

    solve for Vx= V*cos(angle)
    and Vy=V*sin(angle)

    I am having a problem understand this concept relative to what the screenshot below shows

    RrYb6.png



    2. Relevant equations



    3. The attempt at a solution

    When I try to solve this problem I get this
    Vx=40(cos(35))
    = -36.147

    But that's impossible. I think I'm doing it wrong.
     
    Last edited: Jul 29, 2011
  2. jcsd
  3. Jul 29, 2011 #2

    Dick

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    Your calculator is set for radians. You want to set it for degrees. 35 radians is a lot different from 35 degrees.
     
  4. Jul 30, 2011 #3
    You're right, thanks a lot!
     
  5. Jul 30, 2011 #4
    I have another question.

    My projectile starts at point 0,5

    I am given this formula to solve the range of the projectile if y isn't equal to 0

    c1da5860501561519415962ddda5e85e.png

    I'm fine with it until the end, it says y0, why y0? Does it just mean insert the value of y that the projectile starts at?
     
  6. Jul 30, 2011 #5

    Dick

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    Yes, that's what y0 means.
     
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