Vector A points to the north and has length A. Vector B points to the east and has length B = 2.0 A. Find the magnitude of C= 8.8A + B in terms of A.
First clean up your notation.
In vectors you want to find C = 3.6A + B; where Ay = A sin(90) and
Bx = B cos(0) 90 deg is N and 0 deg is E. So we have Bx = 2A
cos(0). Now find the XY components.
X: Cx = 3.6 Ax + Bx = 3.6 A cos(90) + 2A cos(0) =
2A
Y: Cy = 3.6 Ay + By = 3.6 A sin(90) + 2A sin(0) =
3.6A
So that:
C = sqrt(X^2 + Y^2) = sqrt(4A^2 + 3.6^2A^2) = A sqrt(4 + 3.6^2) =
4.118 A ANS. And, though you didn't ask, the angle of C re the X
axis is theta = ATAN(3.6/2).
A = Aj^
B = Bi^ = 2i^
C = 8.8A + B = 8.8Aj^ + 2i^
Magnitude of C = Sqrt ( 8.8*8.8*A^2 + 2*2)
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