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Math Help - physics help

  1. #1
    key
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    physics help

    can someone please help me

    person stands a distance of 0.300 meters from the right end of a 2.00 meter long uniform platform that is supported by two posts, one at each end. The board has a mass of 20.0 kg and the person's mass is 75.0 kg.

    a. determine the force exterted on the board by the post on the left end.

    b. determine the force exerted on the board by the post on the right end.

    Thank you
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  2. #2
    MHF Contributor
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    static equilibrium ...

    \sum F_y = 0

    let F_L = upward force of the support on the left end
    F_R = upward force of the support on the right end

    F_L + F_R = 20g + 75g


    \sum \tau = 0

    let the left end be the pivot point ...

    \tau_{cw} = \tau_{ccw}

    20g(1.0) + 75g(1.7) = F_R(2.0)


    solve for F_R and F_L
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