Concepts Of Physics MCQ Edition [Volume 1]
- Exam
- Concepts Of Physics MCQ Edition [Volume 1]
- Subject
- Physics
- Chapter
- Circular Motion
Concepts Of Physics MCQ Edition [Volume 1] · Physics · Circular Motion
A rod of length L is pivoted at one of its ends and rotated in a...
A rod of length is pivoted at one of its ends and rotated in a horizontal plane with a uniform angular velocity. Let and represent the tensions at distances and , respectively, from the pivoted end.
Options
- AThe relationship between and depends on whether the rotation is clockwise or anticlockwise
- B
- C
- D
Correct answer
D.
Step-by-step solution
Let the mass per unit length of the rod be and its angular velocity be .
Consider an element of length at a distance from the pivoted end. The centripetal force required for this element is .
The tension at a distance from the pivot provides the necessary centripetal force for the remaining portion of the rod from to .
Since is a decreasing function of , the tension is greater at points closer to the pivot.
Given and , we have .
Therefore, .
Consider an element of length at a distance from the pivoted end. The centripetal force required for this element is .
The tension at a distance from the pivot provides the necessary centripetal force for the remaining portion of the rod from to .
Since is a decreasing function of , the tension is greater at points closer to the pivot.
Given and , we have .
Therefore, .