Question:
A uniform metallic rod rotates about its perpendicular bisector with constant angular speed. If it is heated uniformly to raise its temperature slightly, then
A uniform metallic rod rotates about its perpendicular bisector with constant angular speed. If it is heated uniformly to raise its temperature slightly, then
Updated On: Jul 2, 2022
- its speed of rotation increases
- its speed of rotation decreases
- its speed of rotation remains same
- its speed increases because its moment of inertia Increases
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The Correct Option is B
Solution and Explanation
When a metallic rod is heated it expands. Its moment of inertia $(I)$ about a perpendicular bisector increases. According to law of conservation of angular momentum, its angular speed $ (\omega ) $ decreases, since $ \omega \times \frac{1}{l} $ (according to law of conservation of angular momentum).
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Concepts Used:
Heat Transfer
What is Heat Transfer?
It is defined as the movement of heat across the border of the system due to a difference in temperature between system and its surroundings.
How is Heat Transferred?
Heat can travel from one place to another in several ways. The different modes of heat transfer include:
- Conduction - Heat flows from things with higher temp to objects with lower temp.
- Convection - Movement of liquid molecules from higher temp regions to lower temp regions.
- Radiation - Radiant heat is present in every other way in our daily lives. Thermal radiations are also known to as radiant heat. Thermal radiation is generated by the emission of electromagnetic waves.
