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Exam2-solutions

# Exam2-solutions - Version 011 Exam2 distler(56295 This...

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Version 011 – Exam2 – distler – (56295) 2 1. 13.1404 2. 27.5562 3. 73.9508 4. 53.6648 5. 34.3 6. 14.875 7. 68.9087 8. 8.6751 9. 14.7175 10. 25.7488 Correct answer: 14 . 7175 J. Explanation: Let : v = 2 . 9 m / s , r = 0 . 23 m , m = 2 . 5 kg , and I = 0 . 0529 kg · m 2 . E = E rot + E kin = 1 2 I ω 2 + 1 2 m v 2 = 1 2 I v 2 r 2 + 1 2 m v 2 = 1 2 (0 . 0529 kg · m 2 ) (2 . 9 m / s) 2 (0 . 23 m) 2 + 1 2 (2 . 5 kg)(2 . 9 m / s) 2 = 14 . 7175 J . 004 10.0points When it orbited the Moon, the Apollo 11 spacecraft’s mass was 12700 kg, and its mean distance from the Moon’s center was 1 . 7028 × 10 6 m. Assume its orbit was circular and the Moon to be a uniform sphere of mass 7 . 36 × 10 22 kg.
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