Question

Find the measure of the angle between two forces of 30 pounds and 35 pounds if the magnitude of their resultant is 42 pounds

Answer 1

80 degrees

Explanation:

42^2=30^2+35^2-2(30)(35)cosx

1764=2125-(2100)(cosx)

-361= -2100cosx

-361/-2100=cosx

0.1719047619=cosx

cos^-1x=80.10141556

Round off to the nearest degree=80

Answer 2

100 degrees

Explanation:

30^2+35^2-2*30*35cos80

=42

180-80=100