- #1
bumblebeeliz
- 38
- 0
Homework Statement
Three vectors, A, B, and C each have a magnitude of 74 units. Their directions relative to the positive direction of the x-axis are 15, 115, & 215 degrees, respectively. Calculate the magnitude and direction of the vectors
a. A+B+C
b. A+B-C
c. C-2A
Homework Equations
R = (square root) Rx2 + Ry2
The Attempt at a Solution
So I started with a. :
Ax = (74u) (cos15) = 71.478
Ay = (74u) (sin15) = 19.152
Bx = (-74u) (cos110) = 25.309
By = (74u) (sin110) = 69.537
Cx = (-74u) (cos225) = 52.325
Cy = (-74u) (sin225) = 52.325
Ax+Bx+Cx = 149.112
Ay+By+Cy = 141.014
R = (square root) (149)2+ (141)2
R = 205 units
Which doesn't make much sense looking at the first graph? So I attached a second graph because I am not sure which one to use.
Any genius suggestions ?
ps. Red = A Blue = B Green = C Yellow = connected points
Attachments
Last edited: