Question

What happens when a spinning ice skater draws in her outstretched arms? Group of answer choices Her moment of inertia increases causing her spin to slow down. The physics law behind this phenomenon is the conservation of mechanical energy. Her moment of inertia increases causing her spin to slow down. The physics law behind this phenomenon is the conservation of linear momentum. Her moment of inertia decreases causing her spin to speed up. The physics law behind this phenomenon is the conservation of mechanical energy. Her moment of inertia decreases causing her spin to speed up. The physics law behind this phenomenon is the conservation of linear momentum. Her moment of inertia increases causing her spin to slow down. The physics law behind this phenomenon is the conservation of angular momentum. Her moment of inertia decreases causing her spin to speed up. The physics law behind this phenomenon is the conservation of angular momentum.

Answer 1

Answer:

Her moment of inertia decreases causing her spin to speed up. The physics law behind this phenomenon is the conservation of angular momentum.

Explanation:

Theory

The Law of conservation of angular momentum

The angular momentum of a rotating body or a system remains constant unless it is acted upon by an external unbalance force.

Angular momentum = moment of inertia × angular velocity

The moment of inertia = mass×[perpendicular distance from axis of rotation]²

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⇒When skater draws in her outstretched arms the mass distribution get      concentrated towards the axis of rotation so the moment of inertia of the body decrease.

But angular moment should conserve so angular velocity  increases (spin increases)