Posted by Paige on Thursday, August 30, 2012 at 4:55pm.
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

AP Physics  bobpursley, Thursday, August 30, 2012 at 5:16pm
D=i+9j
angle of D= arctan 9

AP Physics  Steve, Thursday, August 30, 2012 at 5:17pm
A+B = (2+3)i + (72)j = 5i+5j
AB = 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°

AP Physics  correction  Steve, Thursday, August 30, 2012 at 5:19pm
Oops. That would be
18083.66 = 96.34°

AP Physics  Paige, Thursday, August 30, 2012 at 6:44pm
thank you! the answer was 96.3
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