Statics sec.2| Exercises(1-1) on |The resultant of two forces| part 2|استاتيكا لغات |2ث

15) Two forces of magnitudes 4 , F Newton act on a particle and the measure of angle between them is 135c, If the direction of their resultant is inclined by an angle of measure 45c on F.
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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