Question
Question: A horizontal platform is rotating with uniform angular velocity around the vertical axis passing thr...
A horizontal platform is rotating with uniform angular velocity around the vertical axis passing through its centre. At some instant a viscous fluid of mass m is dropped at the centre and is allowed to spread out and finally fall. The angular velocity during this period.
A
Decreases continuously
B
Decreases initially and increases again
C
Remains unaltered
D
Increases continuously
Answer
Decreases initially and increases again
Explanation
Solution
Using conservation of angular momentum.