Suppose that the moment of inertia of a skater with arms out and one leg extended is 3.3 kg⋅m2 and for arms and legs in is 0.90 kg⋅m2 . If she starts out spinning at 4.2 rev/s , what is her angular speed (in rev/s) when her arms and one leg open outward?

What color of light must blue light mix with to create white light? a. yellow b. white c. blue d. green

To create electromagnetic induction, which of the following has to move? a. a wire b. a magnet c. a transformer d. either a or b

Starting with only the balmer series light (visible light), how could we ensure that the solar panels generate a current that mark can use for his power station? a)by gradually increasing the brightness (amount) of light that we shine on it. b)by gradually increasing the frequency of the light we shine on it. c)by gradually increasing the wavelength of the light that we shine on it.