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3. Mars has two moons, Deimos and Phobos, traveling in circular orbits (to a good approximation) Deimos takes 30.3 hours to orbit Mars (i.e. 30.3 hours per full rotation around the planet) and travels with a speed of 1.35 km/s. [16 points] a) What is the radius of Deimos orbit around Mars? [9] Hint: First find the circumference of Deimos orbit. Then infer the radius from that.] b) What is the magnitude and direction of Deimos acceleration? [7]

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