MCQ
The angular speed of seconds needle in a mechanical watch is
- ✓$\frac{\pi }{{30}}\,rad/s$
- B$2\pi \,rad/s$
- C$\pi \,rad/s$
- D$\frac{{60}}{\pi }\,rad/s$
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$5 \times 10^{-5} /^{\circ} \mathrm{C}$ along the $\mathrm{x}$ -axis and $5 \times 10^{-6} /^{\circ} \mathrm{C}$ along the $y$ and the $z-$axis. If the coefficient of volume expansion of the solid is $\mathrm{C} \times 10^{-6} /^{\circ} \mathrm{C}$ then the value of $\mathrm{C}$ is