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Statement 1:

The speed of whirlwind in a tornado is alarmingly high

Statement 2:

If no external torque acts on a body, its angular velocity remains conserved

a)

Statement 1 is True, Statement 2 is True; Statement 2 is correct explanation for Statement 1

b)

Statement 1 is True, Statement 2 is True; Statement 2 is not correct explanation for Statement 1

c)

Statement 1 is True, Statement 2 is False

d)

Statement 1 is False, Statement 2 is True



Question ID - 54164 | SaraNextGen Top Answer

Statement 1:

The speed of whirlwind in a tornado is alarmingly high

Statement 2:

If no external torque acts on a body, its angular velocity remains conserved

a)

Statement 1 is True, Statement 2 is True; Statement 2 is correct explanation for Statement 1

b)

Statement 1 is True, Statement 2 is True; Statement 2 is not correct explanation for Statement 1

c)

Statement 1 is True, Statement 2 is False

d)

Statement 1 is False, Statement 2 is True

1 Answer
127 votes
Answer Key / Explanation : (c) -

(c)

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,  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

 or  constant  constant

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 may not remain conserved

127 votes


127