It is known that support a is acted by two forces F1F2, and | F1 | = 40n, which is at an angle with F2 F2 | = 70N, along the horizontal direction; the resultant force of two forces | f | = 100N, calculate the cosine value of angle c tower and the intersection angle beta of resultant force F and F2 Absolute value of vertical index

It is known that support a is acted by two forces F1F2, and | F1 | = 40n, which is at an angle with F2 F2 | = 70N, along the horizontal direction; the resultant force of two forces | f | = 100N, calculate the cosine value of angle c tower and the intersection angle beta of resultant force F and F2 Absolute value of vertical index

It's simple
After drawing the diagram, decompose the force into the components of x-axis and y-axis on the coordinate axis
Let f and F2 intersect at B
On the x-axis: f * CoSb = F1 * COSC + F2
On the Y axis: f * SINB = F1 * sinc
The square sum of the two formulas gives COSC = 5 / 8
Substituting the first formula, we can get CoSb = 19 / 20
I don't know if I'm right
But that's the whole idea and solution\
hey