I understand everything about these questions except finding the angle. When you

Question

I understand everything about these questions except finding the angle. When you put inverse tangent, how do you know when to put y over x or x over y. Also, when finding the angle from the counter clockwise direction from the positive x axis, how do you know what to subtract or when you need to subtract?

1 Three horizontal ropes are attached to a boulder and produce the pulls shown in Figure 1.25. (a) Find the x and y components of each pull. (b) Find the compo- nents of the resultant of the three pulls. (c) Find the magnitude and direction (the counterclockwise angle with the +x axis) of the resultant pull. B (80 N) A (100 N) 30° 30° 53o C (40 N) 2- Vector A has compo- nents Ax= 1.30 cm, Ay- 2.25 cm; vector B has components Bx = 4.10 cm, 8, =-3.75 cm. Find (a) the components of the vector sum A + B; (b) the magni- tude and direction of A + B; (c) the components of the vector difference B A; (d) the magnitude and direction of B - A

Explanation / Answer

First,I think u should need to revise basic trigonometry.

Ok ,whenever you measure angle from x axis then put y over x.

And whenever you measure angle from y axis then put x over y.For example in measuring angle of vector A ,put y over x..but in case of vecto B put x over y.

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