If the mass of a material is 45 grams and the volume of the material is 11 cm^3, what would the density of the material be? answer units

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

Frank just graduated from eighth grade. assuming exactly four years from now he will graduate from high school how many seconds does he have until his high school graduation

An object dropped from cliff falls with a constant acceleration of 10 metre per second square find its speed of two seconds after it was dropped