A skater has a moment of inertia 5 kg.m2 (kilogram, meter squared) when her arms are outstretched and 1 kg. m2 when her arms are brought to her sides. She starts to spin at 1 revolution per second when her arms are outstretched and the she pulls her arms to her sides. a. What is her final angular momentum?

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Torque

Torque is the rotational equivalent of linear force in physics and mechanics. Based on the course of study, it is also known as the moment of force, rotational force, or turning effect.