Question

A man is sitting with folded hands on a revolving table. Suddenly, he stretches
his arms. Angular speed of table would A) Increase
B) Decrease
C) Remain the same
D) Nothing can be said

Answer 1

Answer:

Angular momentum will increase.

Explanation:

Correct option is

B

Moment of inertia will decrease.

According to conservation of Angular Momentum,

Iω = constant

Hence, when a person sitting on a rotating stool suddenly lowers his hands, then his angular velocity will increase and moment of inertia will decrease.

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Answer 2

Increase

Explanation:

The angular speed formula is used to calculate the distance the body covers in terms of rotations or revolutions to the time taken.

Speed is all about how slow or fast an object moves. Angular speed is the speed of the object in rotational motion.

Angular Speed Formula computes the distance covered by the body in terms of revolutions or rotations to the time taken.

Distance travelled is represented as θ and is measured in radians. The time taken is measured in terms of seconds. Therefore, the angular speed is articulated in radians per seconds or rad/s.

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