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Thermal Properties of Matter — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysicsThermal Properties of Matter1 Mark
MCQ
A uniform metallic rod rotates about its perpendicular bisector with constant angular speed. If it is heated uniformly to raise its temperature slightly:
  • A
    Its speed of rotation increases.
  • B
    Its speed of rotation decreases.
  • C
    Its speed of rotation remains same.
  • D
    Its speed increases because its moment of inertia increases.
✓

Answer

  1. Its speed of rotation decreases.

Explanation:

On heating a uniform metallic rod its length will increase so moment of inertia of rod increased from I1 to I2 (i.e., I1 < I2). Due to law of conservation of angular momentum,

$\text{I}_1\omega_1=\text{I}_2\omega_2$

$\because\ \text{I}_1<\text{I}_2\Rightarrow\omega_1>\omega_2,$ so angular speed decreases.

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