the satellite. Hint: Modify Equation 7.23 so it is suitable for objects orbiting the Earth rather than the Sun. 42. An artificial satellite circling the Earth completes each orbit in 110 minutes. (a) Find the altitude of the satel- lite. (b) What is the value of g at the location of this satellite? 43. A satellite of Mars, called Phoebus, has an orbital radius of 9.4 X 100 m and a period of 2.8 X 10 s. Assuming the orbit is circular, determine the mass of Mars. 44. A 600-kg satellite is in a circular orbit about Earth at a height above Earth equal to Earth's mean radius. Find (a) the satellite's orbital speed, (b) the period of its revolution, and (c) the gravitational force acting on it. r orbits around the Earth.

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