On being introduced to the laws of thermodynamics, a student retorted, “When the brakes of a moving car are applied, the kinetic energy of the car does diminish and even drops to zero when the car comes to a stop.”
The student thought that his observation about the car contradicted the first law of thermodynamics. Does the reduction of the car’s kinetic energy really contradict the first law of thermodynamics?

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