posted by Paige on .
Consider the vectors A = 2.00 i + 7.00 j and B = 3.00 i - 2.00 j.
(a) Sketch the vector sum C = A + B and the vector subtraction D = A - B.
(b) Find analytical solutions for C and D first in terms of unit vectors and then in terms of polar coordinates, with angles measured with respect to the positive x axis.
I just can't figure out what the degree should be for the D vector polar coordinate
angle of D= arctan 9
A+B = (2+3)i + (7-2)j = 5i+5j
A-B = -i+9j
just draw a triangle with hypotenuse from (0,0) to (-1,9)
tanθ = 9/-1
θ = 180+83.66° = 263.66° or -96.34°
Oops. That would be
180-83.66 = 96.34°
thank you! the answer was 96.3