HW11-problems-1 - al-buainain(mia454 HW11 mackie(10611 This...

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al-buainain (mia454) – HW11 – mackie – (10611) 1 This print-out should have 12 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. NOTE THE SAT DEADLINE 001 10.0 points Three masses are arranged in the ( x, y ) plane as shown. 9 kg 9 kg 6 kg y (m) 1 3 5 7 9 x (m) 1 3 5 7 9 What is the magnitude of the resulting force on the 9 kg mass at the origin? The value of the universal gravitational constant is 6 . 6726 × 10 - 11 N · m 2 / kg 2 . Answer in units of N. 002 10.0 points The planet Krypton has a mass of 3 . 1 × 10 23 kg and radius of 2 . 2 × 10 6 m. What is the acceleration of an object in free fall near the surface of Krypton? The gravita- tional constant is 6 . 6726 × 10 - 11 N · m 2 / kg 2 . Answer in units of m / s 2 . 003 (part 1 of 2) 10.0 points On the way to the moon, the Apollo astro- nauts reach a point where the Moon’s gravi- tational pull is stronger than that of Earth’s. Find the distance of this point from the center of the Earth. The masses of the Earth and the Moon are 5 . 98
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