(all of the questions a-d have the same answer options ) (596) Problem 16: An ic

Question

(all of the questions a-d have the same answer options )

(596) Problem 16: An ice skater is spinning with her arms out and is not being acted upon by an external torque. s: 25% Part (a) When she pulls her arms in close to her body what happens to her angular momentum? OIt remains unchanged OIt decreases O It cannot be determined ? It increases Submarl Hint | Feedback | 1 ve up!! I giveup! Hints: deduction per hint. Hints remaining: Feedback: 506 deduction per feedback _ - 25% Part (b) When she pulls her arms in, what happens to her moment of inertia? ?? 25% Part (c) What happens to her angular speed when she pulls her arms in? à 25% Part (d) What happens to her rotational kinetic energy when she pulls her arms in?

Explanation / Answer

(A) external torque is zero.

hence angular momentum will remain same.

Ans: It remains unchanged.

(B) when mass is pulled near the axis.

then moment of inertia decreases.

Ans: It decreases

(C) L = I w

I-> decreases

so angular speed -> increases

Ans: it increases.

(D) KE = I w^2 / 2

KE = (L / w)(w^2)/2 = L w / 2

w increaases so KE also increases.

Ans: It increases.

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