A highway curve has a radius of 140 m and is unbanked. A car weighing 12,000 N goes around the curve at a speed of 24 m/s without slipping. What is the magnitude of the horizontal force of the road on the car?

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