CBSE Class 12-science Answered
solve
Asked by sumahr | 14 Jan, 2010, 08:11: PM
Expert Answer
Let's denote the vector by bold face letters.
a + b + c = 0
-c = a + b
Using triangle law of vector addition,
c2 = a2+b2+2abcosθ,
where a, b and c are the magnitudes of the vectors and θ is the angle between the vectors added.
92 = 52+72+2x5x7xcosθ,
cosθ = 1/10
θ = cos-1(1/10)
Regards,
Team,
TopperLearning.
Answered by | 15 Jan, 2010, 09:38: AM
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