Rotation 4 Question 8
9. A homogeneous of length and mass is pivoted at the centre in such a way that it can rotate freely in the vertical plane (figure).
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Answer:
Correct Answer: 9. (a)
(b)
Solution:
- In this problem we will write
for the angular momentum because has been used for length of the rod.
(a) Angular momentum of the system (rod + insect) about the centre of the
(b) Due to the torque of weight of insect about
Let at time
At time
Substituting these limits, we get
Substituting in Eq. (i), we get