The Spitfire (film 1924)
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a photon does not have a mass, it carries a momentum p along its propagation direction, which is related to its energy e by p = e c where c is the light speed. a solar sail is a proposed method of spacecraft propulsion by shining sunlight on it to exert pressure to push the sail. suppose the area of the sail is a and there are n photons per unit area per second for the sunlight. what is the maximum resultant force on the spacecraft by the sunlight?
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