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31 May, 12:55

two forces act at 60 degrees and their resultant is 14 neutons, if they act at 90 degrees their resultant is 90 degrees. find the mangitude of forces?

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  1. 31 May, 13:11
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    A2A.

    Let the magnitude of the two forces be x and y.

    Let resultant at right angle be p ( = √15N) and at 60 degrees be q ( = √18N.

    Now, p = √ (x2 + y2) = √15,

    q = √ (x2 + y2 + 2xycos60) = √18.

    So x2 + y2 = 15,

    x2 + y2 + xy = 18,

    therefore xy = 3 or y = 3/x.

    Now, x2 + (3/x) 2 = 15,

    x4 + 9 = 15x2,

    x4 - 15x2 + 9 = 0.

    Now find the roots of this quadratic equation, the two values of x will correspond to the magnitudes of the two vectors.
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