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Homework Help: Projectiles dealing with a bullet

  1. Nov 7, 2011 #1

    gotpink74

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    1. The problem statement, all variables and given/known data
    A shell is fired from the ground with an initial speed of 1.60*10^3m/s at an initial angle of 56° to the horizontal.
    (a) Neglecting air resistance, find the shell's horizontal range.

    (b) Find the amount of time the shell is in motion.



    2. Relevant equations

    vector triangle sin and cosine

    3. The attempt at a solution
    all of my answers have been wrong i did the triangle and got hyp 1600 opp side 1326.46 bottom 894.7 from there i dont know where to go please HELP
     
    gotpink74, Nov 7, 2011
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  3. Nov 7, 2011 #2

    gneill

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    Staff: Mentor

    You'll need to use the kinematic equations for projectile motion (horizontal and vertical components).
     
    gneill, Nov 7, 2011
  4. Nov 7, 2011 #3

    gotpink74

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    i know that i just can't figure out the horiz and vertical components is
    vertical
    Vi:1600
    thats all i know
     
    gotpink74, Nov 7, 2011
  5. Nov 7, 2011 #4

    OliverENewell

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    Would be better to:

    1) Resolve the horizontal by doing Cos (theta) x initial velocity
    2) v=u+at to get time in the air
    3) Get horizontal component with trig like in 1)
    4) distance bullet traveled is s = d / t rearranged to give d = s x t

    That's all I can give you without giving you the answer on a plate :L
     
    OliverENewell, Nov 7, 2011
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