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  1. #1
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    Any Physics genius' on this board?

    I need help with a problem for my AP online class, my teacher is a bigger idiot than Pacman Jones, and can't teach to save her life:
    A cannonball is fired from a cliff 140 m high downward at an angle of 27 degrees with respect to the horizontal. If the cannon's muzzle velocity is 34 m/s, what is the cannon ball's speed when it hits the ground?
    Any help would be appreciated. You don't necessarily have to do it for me, but just show me which equations to use, and which variables mean what.
    Thanks in advance, I really appreciate it.



  2. #2
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    Re: Any Physics genius' on this board?

    What planet is this cannon fired from?



  3. #3
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    Re: Any Physics genius' on this board?

    Quote Originally Posted by tim_redd View Post
    What planet is this cannon fired from?
    Earth.



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    Re: Any Physics genius' on this board?

    European or African Cannonball?



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    Re: Any Physics genius' on this board?

    Are we taking gravity into account?


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  6. #6
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    Re: Any Physics genius' on this board?

    How hard is the ground? If it's hard enough, it's gonna be 0.



  7. #7
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    Re: Any Physics genius' on this board?

    Equation for constant acceleration

    at^2 + v0t + s = 0, where:

    a = acceleration
    v0 = initial velocity of the object
    s = initial position of the object


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    Re: Any Physics genius' on this board?

    You know I don't speak Spanish, CIMD.



  9. #9
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    Re: Any Physics genius' on this board?

    Split your velocity into two components: an x component and a y component, and try to work it from there.


    Green hills for thy throne, and for crown a golden melody/Ringing in the hearts of all who bring thee love and loyalty/Dear Alma Mater, make our spirits great
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  10. #10
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    Re: Any Physics genius' on this board?

    Has resistance been taken out of the problem?


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  11. #11
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    Re: Any Physics genius' on this board?

    Quote Originally Posted by keepngoal View Post
    Has resistance been taken out of the problem?
    Yes.



  12. #12
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    Re: Any Physics genius' on this board?

    Things that need to be taken into account include terminal velocity (you would need the mass of the cannon ball), gravity in general (the cannon ball may be traveling almost straight down by the time it gets to the ground)

    Personally I would look into projectile motion equations. All projectiles proceed on a curve, you are just starting 60% of the way through the curve.



  13. #13
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    Re: Any Physics genius' on this board?

    Quote Originally Posted by 3TrueFans View Post
    European or African Cannonball?
    Quote Originally Posted by keepngoal View Post
    Has resistance been taken out of the problem?
    Clearly a French cannonball.


    Next question is how did it get to England?


    Last edited by DaddyMac; 09-23-2009 at 11:03 AM.

  14. #14
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    Re: Any Physics genius' on this board?

    I'd listen to sodakjoe...he knows his stuff



  15. #15
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    Re: Any Physics genius' on this board?

    I have nothing to offer this thread in terms of an answer...but what does it say about me that I am curious to see what the answer is? I keep hitting refresh to see if someone has offered an answer...



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