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Homework Help: Launge a spring on a inclinded plane in a bucket?

  1. Apr 22, 2010 #1
    launge a spring on a inclinded plane in a bucket??

    1. The problem statement, all variables and given/known data
    ok im ask to find the length i have to pull on the spring hooked to the edge of a inclinded plane and release it to shoot the spring in to the bucket. anyoen have any idea how to do it??

    2. Relevant equations
    i had worked out some of the possible solusions..
    range formula = ((v^2)/fg)sin2(theata)
    rearragne for V
    V= root [ (R)(fg)/sin2theata ] - eq'n 1
    Fnet = Fa - (Ff + fg sin theata), inclinded plane equations
    Fa = Ee (elastic energy of the spring)
    Ee = 1/2 K X^2 , K= spring constant, X = the length which the spring is being stretched and its the thign i want to find
    sub Ee = Fa = 1/2 Kx^2 in to Fnet equation
    Fnet = 1/2 kx^2 -fg (fg cos theata mUK (friction coeificent) + fg sin theata)
    EK = 1/2 m v^2
    EK = F d cos theata
    equate them together
    1/2 m v^2 = F d cos theata , assuming d = length of inclinded plane
    than sub in equation V and equation Fnet as F in to 1/2 m v^2 = F d cos theata then
    rearrange for X which is the length which i have to pull to fire the spring in to the bucket

    3. The attempt at a solution
    i kinda type attempt at solution up there ...sry..

    so yea after i rearrange for x and put in possible values for all variables...the answer doesnt seem to be .... realistic enough to believe....coz i cant do the lab now at home...coz i dont have the materals...but my lab is tmr... anyone got any idea??
    thx =]
  2. jcsd
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