Question

A circular table rotates about a vertical axis with a constant angular speed $\omega$ A circular pan rests on the turn table (with the centre coinciding with centre of table) and rotates with the table. The bottom of the pan is covered with a uniform small thick layer of ice placed at centre of pan also rotates with the pan.The ice starts melting. The angular speed of the turn table

• A. remains the same
• B. decreases
• C. increases
• D. may increase or decrease depending on the thickness of ice layer

Answer 1

The correct option is B decreases

$\text{Explanation:-}$

After melting, ice will distribute in whole pan.

$\Rightarrow$ So moment of inertia I will increase Hence angular speed ω will decrease.

Here, $I\omega =constant.$

$\text{Hence the correct option is B}$