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It has been proposed that a spaceship might be propelled in the Solar System by radiation...

It has been proposed that a spaceship might be propelled in the Solar System by radiation pressure, using a large sail made of foil. The reflectivity of foil causes the radiation force to be twice what it is normally. Calculate the area (in square kilometers) that the sail must be for the radiation force to be equal to the Sun’s gravitational attraction. Assume that the mass of the ship and sail is 1500 kg and Q=1

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