What is the Angle Between Forces in Equilibrium?

[kushalksoni]

Homework Statement

1. Two Forces of 692 N and 423 N acts at a point. The resultant force is 786 N. Find the angle between the Forces.[SOLVED]

2. Three forces acting at a point are in equilibrium. The forces are 980 lbs, 760 lbs and 1220 lbs. Find the angle between the forces (to the nearest minute)

Homework Equations

The Attempt at a Solution

1. I tried the Law of cosines and I got 91.96 [SOLVED...I had law of cosines wrong, instead of 2abCosX i had a 4]
[Answer: 93.92]2. No idea how to draw it out, or solve. How do you define minutes in relation to degrees? [Answer: 91.92, 141.49 , 126.6]

 

[yinmin]

sorry to tell u..the first one i cannot get the answer u had given... i just get 86.08...far away from your answer...i same with u use the formula...but i finally cannot get the answer..can u tell me...

 

[kushalksoni]

Well, right now I'm in Calculus, Physics C AP next year haha. From last year though, I remember you always have to do the biggest side sooo...786²=692²+423²-2(423)(692)(cosX)