Answers

2014-10-10T15:42:52+05:30
R2 =P2 +Q2 + 2 PQ cos A Where R = resultant , P and Q are vectors , A is angle between the 2 vectors] now, (4N)2 = (2N)2 + (3N)2 + 2 . 2N . 3 N . cos A 16N2 = 4N2 + 9N2 + 12N2. Cos A 16N2- 13 N2 = 12N2 cos A 3N2 / 12N2 = cos A ΒΌ = cos A A = cos-1 (1/4) A = 75.52248781
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