New Zealand Scholarship Physics Practice Questions - New Zealand Scholarship Physics Assessment (NZQA Standard 93103) Exam

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A figure skater spinning on frictionless ice pulls her arms inwards, reducing her moment of inertia to half its initial value (I_f = 0.5 * I_i). What happens to her rotational kinetic energy?

It doubles (E_k,f = 2 * E_k,i). It remains unchanged. It decreases by half. It quadruples.

Correct Answer:

It doubles (E_k,f = 2 * E_k,i).

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