Question

F1 and F2 5 and 15lb, make 40° with each other, what is the resultant?

Answer 1

how does the diagram look like?

Answer 2

\[R=\sqrt{a^2 + b^2 + 2 a b \cos}\]

Answer 3

use this formula

Answer 4

a = 15

b = 5

cos theta = 40

Answer 5

and the angle would be?

Answer 6

wait , i thought length of R is just ra^2+b^2

Answer 7

cos 40 = 0.76