Question

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 of increases because its moment of inertia increases

Answer 1

Answer: (B)

Its speed of rotation decreases

Answer 2

When the rod is heated uniformly to raise is temperature slightly. Its moment of inertia (I) increases. Since angular momentum, $L = I\omega,\omega$ (angular speed) decreases to cons4erve L.