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March 28, 2017

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Blocks A and B of weight 200N and 100N respectively, rest on a 30 inclined plane and are attached to the post which is held perpendicular to the plane by force P, parallel to the plane, Assume that all surfaces are smooth and that the cords are parallel to the plane. Determine the value of P. Also find the Normal reaction of Blocks A and B.

  • Engg Mechanics - ,

    Block A:
    200*sin30 = 100 N. = Force parallel
    to the plane.
    Fn = 200*cos30 = 173.2 N. = Normal force

    Block B:
    100*sin30 = 50 N. = Force parallel to
    the plane.
    Fn = 100*cos30 = 86.6 N. = Normal force.

    P = Wa+Wb = 200 + 100 = 300 N.

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