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The two stars in a binary star system have masses 1.7×10^30 kg and 6.1×10^30 kg . They are separated by 2.0×1012 m.
a) What is the system's rotation period, in years?
b) What is the speed of the lightest star?
c) what is the speed of the heaviest star?
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A parachutist with a camera, both descending at a speed of 11 m/s, releases that camera at an altitude of 140 m. Explain how long does it take the camera to reach the ground?
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