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What are the direction cosines of the vector 6i + 2j + 3k?
A1/6, 1/2, 1/3
B6/5, 2/5, 3/5
C6/11, 2/11, 3/11
D6/7, 2/7, 3/7
Answer & Solution
Correct answer: D. 6/7, 2/7, 3/7
The magnitude is sqrt(36 + 4 + 9) = 7, so the cosines are the components divided by 7.
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