Friday

November 28, 2014

November 28, 2014

Posted by **Ariza** on Sunday, May 2, 2010 at 7:39pm.

- Calculus -
**MathMate**, Sunday, May 2, 2010 at 7:52pmThe two components and the negative of the resultant form a set of forces in equilibrium, therefore these forces (vectors) form the side of a closed triangle.

The three lengths (sides) are known (200,150,80), thus the angle can be found by the cosine rule:

x=cos(A)=(b²+c²-a²)/(2bc)

If cos(A) equals zero, the forces are perpendicular to each other. If not, angle A is given by cos^{-1}x.

Note that if x<0, then A>90°.

**Answer this Question**

**Related Questions**

Physics - partscoretotalsubmissions1--10/12--10/13--10/14--10/1----4--The tail ...

PHY - The components of a vector V can be written (Vx, Vy, Vz). What are the ...

physics - Position vector r has magnitude of 14.8m and direction angle 240 ...

Calculus - Resolve a 500-N force into two rectangular vector components such ...

Math - Vectors - Resolve vector u =[3,4,7] into rectangular components, on which...

Calculus - Resolve the vector v=[7,9] into rectangular components, one of which...

physics - Which of the following statements is a true statement? A. A vector can...

Physics - The velocity vefot of a ball is v(t)=-3x+4y at any time. Its initial ...

physics--vectors - the components of a vector V can be written (Vx,Vy,Vz). what ...

Physics - You are given vectors A = 5.0i - 6.5j & B = -3.5i + 7.0j. A third ...