. Assertion: The speed of whirlwind in a tornado is alarmingly high
Reason: If no external torque acts on a body, its angular velocity remains conserved.
Best Answer
Solution : In a whirlwind in a tornado, the air from nearby regions gets concentrated in a small space thereby decreasing the value of its moment of inertia considerably. Since, Iw =constant, so due to decrease in moment of inertia of the air, its angular speed increases to a high value.
If no external torque acts, then
As in the rotational motion, the moment of inertia of the body can change due to the change in position of the axis of rotation, the angular speed my not remain conserved
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