A student with arms outstretched stands on a platform that is rotating with a constant angular speed. The student then pulls his arms inward. This will result in

an increase in the angular speed due to the conservation of angular momentum principle.

Explanation:

From this question, this student has his arms outstretched and he is standing on a platform which is rotating with a constant angular speed.

When his arms are stretched, his moment of inertia I is increased.

Now as This student pulls his arms inwards, His moment of inertia I is going to decrease

Therefore, through the use of the conservation of angular momentum,

there would be an increase in angular speed.

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