Question

Assertion (A) : A diver curls his body to perform more number of somersaults.
Reason (R) : Curling reduces his moment of inertia and increases angular velocity.

• A. Both A and R are true and R is correct explanation of A
• B. Both A and R are true and R is not correct explanation of A
• C. A is true and R is false
• D. A is false and R is true

Answer 1

The correct option is A Both A and R are true and R is correct explanation of A

On curling the body moment of inertia will decrease or mass comes near to the axis of rotation.
As no external torque $\therefore$ $\text{angular momentum remains constant}$.
$L=$ Constant
$I=$ Not Constant
$\therefore I\propto \frac{1}{\omega .}$
As $I$ is decreased the $\omega$ get increased.
Therefore diver com perform more number of somersaults.