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Direction Cosines
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Qn #1553
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If a vector $\vec{a}$ makes an equal angle with the coordinate axes and has magnitude 3, then the angle between $\vec{a}$ and each of the three coordinate axes is
A.
$cos^{-1}(\frac{1}{\sqrt{3}})$
B.
$sin^{-1}(\frac{1}{\sqrt{3}})$
C.
$\frac{\pi}{6}$
D.
$\frac{\pi}{3}$
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Qn #1260
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The direction cosines of the vector a = (- 2i + j – 5k) are
A.
-2, 1, -5
B.
C.
D.
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Direction Cosines Practice Questions | Group Studies Library | Tancet Group Studies