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Q. A student, sitting on a stool rotating at a rate of 20 RPM holds masses in each hand. when his arms are extended, the total rotational inertia of the system is 4.5 kg/m^2. he pulls his arms in close to his body, reducing the total rotational inertia to 1.5kg/m^2. if there are no external torques, what is the new rotation velocity of the system.

Q. A diverging lens (f = -12 cm) is located 20.0 cm to the left of a converging lens (f = 34.5 cm). A 3.00 cm tall object stands to the left of the diverging lens, exactly at its focal point.

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