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Q. The atmospheric pressure at sea level is about 1.0 x10^5 Pa. What is the force at sea level that air exerts on the top of a typical office desk, 143 cm long and 83 cm wide?

Q. What is the thinnest soap film (excluding the case of zero thickness) that appears black when viewed by reflected light with a wavelength of 480 {rm nm}? The index of refraction of the film is 1.33, and there is air on both sides of the film.

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