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STD 11 - 6. system of particles and rotational motion — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 11 - 6. system of particles and rotational motion4 Marks
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
  • ✓
    Its speed of rotation decreases
  • C
    Its speed of rotation remains same
  • D
    Its speed of rotation increases because its moment of inertia increases
✓

Answer

Correct option: B.
Its speed of rotation decreases
b
When a metallic rod is heated it expands. Its moment of inertia $(1)$ about a perpendicular bisector increases. Ac cording to law of conservation of angular momentum, its angular speed ( $\omega$ ) decreases, since $\omega \propto 1 / l$ (ac cording to law of conservation of angular momentum).

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