Unformatted text preview: lai (yl8859) – HW20 – Ross – (15200) 1 This printout should have 7 questions. Multiplechoice questions may continue on the next column or page – find all choices before answering. 001 10.0 points A distant star has a single planet circling it in a circular orbit of radius 7 . 11 × 10 11 m. The period of the planet’s motion about the star is 703 days. What is the mass of the star? The value of the universal gravitational constant is 6 . 67259 × 10 11 N · m 2 / kg 2 . Answer in units of kg. 002 10.0 points An object is dropped from rest from a height 6 . 9 × 10 6 m above the surface of the earth. If there is no air resistance, what is its speed when it strikes the earth? The acceleration of gravity is 9 . 81 m / s 2 and the radius of the Earth is 6 . 37 × 10 6 m. Answer in units of km / s. 003 (part 1 of 2) 10.0 points When it orbited the Moon, the Apollo 11 spacecraft’s mass was 15400 kg, its period was 109 min, and its mean distance from the Moon’s center was 1 . 74578...
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 Winter '08
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 Physics, mechanics, Celestial mechanics, gravitational acceleration

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