Find the magnitude of the vector a and the smallest possitive angle θ from the possitive x-axis to the vector OP that corresponds to a.
a=10i-10j

Question

Find the magnitude of the vector a and the smallest possitive angle θ from the possitive x-axis to the vector OP that corresponds to a. 
a=10i-10j

owlfred · Answer

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anonymous · Answer

magn= 10root2

anonymous · Answer

theta = 135

anonymous · Answer

i m getin magnitude as 10 rot 2

anonymous · Answer

I understand how you are finding the Magn. however I have no idea how you found theta.

anonymous · Answer

the vector lies in the second quadrant...if you swing the arm 135 deg anticlockwise(+ve)

anonymous · Answer

u just plot the vector on the plane

anonymous · Answer

ok thank you

anonymous · Answer

the vector lies in the fourth quadrant. so it will be tan(theta) = -1. the angle will be 315degrees. but tan(315)=tan(135).so the answer is 135degrees.

anonymous · Answer

oh pellet...sorry