Ex 10.2, 12 - Chapter 10 Class 12 Vector Algebra (Term 2)
Last updated at April 21, 2021 by Teachoo
Transcript
Ex 10.2, 12 Find the direction cosines of the vector ๐ ฬ + 2๐ ฬ + 3๐ ฬ . Let ๐ โ = ๐ ฬ + 2๐ ฬ + 3๐ ฬ = 1๐ ฬ + 2๐ ฬ + 3๐ ฬ Direction ratios are a = 1, b = 2, c = 3 Magnitude of ๐ โ = โ(12+2^2+3^2 ) |๐ โ | = โ(1+4+9) = โ14 Direction cosines are (๐/|๐ โ | ,๐/|๐ โ | ,๐/|๐ โ | ) Direction cosines of ๐ โ = (๐/โ๐๐,๐/โ๐๐,๐/โ๐๐)
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