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2. Mars orbits the Sun in a nearly circular orbit of radius 2.28 x 10 m. The mass of Mars is 6.42 x 102 kg.

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2. Mars orbits the Sun in a nearly circular orbit of radius 2.28 x 10" m. The mass of Mars is 6.42 x 102 kg. Mars experiences a gravitational force from the Sun of 2.1 magnitude 1.63 x 1021 N. Calculate the speed of Mars and the period of revolution m (page 309) for Mars in terms of Earth years. T Al [ans: 2.41 x 10* m/s; 1.90 Earth years]

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