Question

find the resultant of two forces of 4N and 5N is. 1. they are inclined perpendicular to each other. 2. they are inclined at 35⁰ to each other. 3. they are inclined at 145⁰ to each other

Answer 1

1)

$$R=\sqrt{4^2+5^2+2(4)(5)\cos{90}}=6.4\ N$$

2)

$$R=\sqrt{4^2+5^2+2(4)(5)\cos{35}}=8.6\ N$$

3)

$$R=\sqrt{4^2+5^2+2(4)(5)\cos{145}}=2.9\ N$$