Which of the following correctly lists the flow of energy on a radio that is operated by a hand crank? A human muscles → crank → electricity → radio speaker B radio speaker → crank → electricity → human muscles C human muscles → radio speaker → electricity → crank D radio speaker → human muscles → crank → electricity

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With the simplified model of the eye, what corrective lens (specified by focal length as measured in air) would be needed to enable a person underwater to focus an infinitely distant object? (be careful-the focal length of a lens underwater is not the same as in air! assume that the corrective lens has a refractive index of 1.62 and that the lens is used in eyeglasses, not goggles, so there is water on both sides of the lens. assume that the eyeglasses are 1.90