Someones car will not start, so two friends help him by pushing it. the mass of the car is 800 kg. By pushing as hard as they can for 10 seconds they make the car reach a speed of 2 metres per. second. calculate the acceleration they give to the car

Identify the theory that can be used to explain each phenomenon. answers diffraction: wave theory interference: wave theory reflection: both particle and wave theories refraction: both particle and wave theories

True or false graphs must include scales that increase by the same amount

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