As you slide a heavy box across the floor, friction applies a force of -60 n over a distance of 5 m. how much work is done by friction? a. -55 j b. -60 j c. -300 j d. -15 j

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