Physics

A weight of 4.33 N is suspended by the string fasten at its upper end. A horizontal force is applied to the weight so that the string makes an angle of 30 degrees with the vertical. Find the horizontal force and the tension in the spring.

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  1. Balance vertical forces on the weight.

    Vertical:
    T cos 30 - M g = 0

    Solve for tension, T

    Then balance the horizontal forces, including the applied force, F.

    F - T sin 30 = 0

    F = T/2 = (1/2)M*g/cos30 = M*g/sqrt3

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