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
Show Solution
Verified By Collegedunia
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).
Was this answer helpful?
0
0
Top AIIMS Physics Questions
- The ratio of the dimensions of Plancks constant and that of the moment of inertia is the dimension of
- If the mass of a body is $M$ on the surface of the earth, the mass of the same body on the surface of the moon is
- $1 \,Kcal$ of heat flowing through a rod of iron. When the rod is cut down to $4$ pieces then what will be the heat flowing through each piece having same differential temperature?
- Speed in kilometer per hour in S.I. unit is represented as
- S.I. unit of velocity is
View More Questions
Top AIIMS Heat Transfer Questions
- The unit of thermal conductivity is
- A body at a temperature of $728^{\circ} C$ and has surface area $5\, cm ^{2}$, radiates $300\, J$ of energy each minute. The emissivity is (Given Boltzmann constant $=5.67 \times 10^{-8} Wm ^{2} K ^{4}$ )
- A black body emits heat at the rate of $20\, W$. When its temperature is $727^{\circ} C$. Another black body emits heat at the rate of $15\, W$, when its temperature is $227^{\circ} C$. Compare the area of the surface of the two bodies, if the surrounding is at NTP.
- Heat from the sun reaches the earth by convection. Air can be heated only by convection.
Top AIIMS Questions
- Which of the following is true?
- The ratio of the dimensions of Plancks constant and that of the moment of inertia is the dimension of
- Biological Oxygen Demand (BOD) is a measure of
- Freon used as refrigerant is
- Which of the following statement is true ?
View More Questions
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.
