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Volcano problem

  1. Sep 22, 2009 #1
    A 500m high volcano eject rocks at a speed 30 m/s.What is max horizontal distance reached by the rock?
     
  2. jcsd
  3. Sep 22, 2009 #2

    rl.bhat

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    Hi peace1709, Welcome to PF.
    What do you about the problem?
    In what direction the rocks are moving?
    which are the relevant equations?
     
  4. Sep 22, 2009 #3
    i use the equation range= [(V initial)^2 x (sin 2A)]/[g].
    where v inital is 30 m/s and i assume A=45 degrees, and g=9.8 m/s^2
    but i got the answer wrong.
     
  5. Sep 22, 2009 #4
    i got 91.7 m and its wrong, can u help me?
     
  6. Sep 22, 2009 #5

    rl.bhat

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    In your calculation you have not taken into account the height of the volcano.
     
  7. Sep 22, 2009 #6
    oh ya.but i dont know how to relate the height. can u help me?
     
  8. Sep 22, 2009 #7

    rl.bhat

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    You can use the formula
    y = yo + v*t - 0.5*g*t^2.
    Here v = vo*sinθ
    And t = x/vo*cosθ
    y is the final position of the rock and yo is the initial position of the rock.
     
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