Question

two forces 20n and 30n are acting at a point at an angle of 120. Find the magnitude and direction of their resultant.

Answer 1

Explanation:

Forces f1 and f2 are 20N and 30N respectively. Angle=> 120°. Resultant is

$\sqrt{ {f1}^{2} + {f2}^{2} + 2.f1.f2} = >$

$\sqrt{ {20}^{2} + {30}^{2} + 2.20.30cos \frac{2\pi}{3}} = >$

$\sqrt{400 + 900 + 1200( - \frac{1}{2}) } = >$

$\sqrt{1300 - 600} = > \sqrt{700} = > 10 \sqrt{7}$

Hope it helps you.