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Let a vector $\bar{r}$ make angle $60^{\circ}, 30^{\circ}$ with $\mathrm{x}$ and y-axes respectively.
What are the direction cosines of $\bar{r}$ ?
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What are the direction cosines of $\bar{r}$ ?
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Verified Answer
The correct answer is:
$\left\langle\frac{1}{2}, \frac{\sqrt{3}}{2}, 0\right\rangle$
$\left.\mathrm{r}= < 1, \mathrm{~m}, \mathrm{n}>; \mathrm{r}= < \cos 60^{\circ}, \cos 30^{\circ}, \cos 90^{\circ}\right\rangle$
Direction cosines of $\overrightarrow{\mathrm{r}}= < \frac{1}{2}, \frac{\sqrt{3}}{2}, 0>$
Direction cosines of $\overrightarrow{\mathrm{r}}= < \frac{1}{2}, \frac{\sqrt{3}}{2}, 0>$
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