Find the magnitude of F.
16) Two forces of magnitudes 4 , F Newton act on a particle and the angle between them is 120c.If their resultant is perpendicular to the first force, find the magnitude of F.
17) Two forces of magnitudes F , F 3 Newton act on a particle. If the magnitude of their resultant is 2F Newton. Find the measure of the angle between the two forces.
18) Two forces of magnitudes 12 , 15 Newton act on a particle and the (cosine) of the angle between them equals - 4/5 . Find the magnitude of their resultant and the measure of the angle
of inclination of the resultant to the first force.
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