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Exam_3_form D Solutions - Form D Exam 3 PHY231 Spring 2013...

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Exam 3 PHY231 Spring 2013 Section 2 Form D 1 1. A car travels at a constant speed around a flat circular track with a radius of 50.0 m and takes 1.00 minute to complete one revolution. What is the centripetal acceleration of the car? A) 6.28 m/s 2 E) 0.732 m/s 2 B) 5.34 m/s 2 F) 2.21 m/s 2 C) 0.652 m/s 2 G) 6.91 m/s 2 D) 0.548 m/s 2 H) 0.220 m/s 2 2. The mass and radius of the moon are 7.4 × 10 22 kg and 1.7 × 10 6 m, respectively. What is the mass of an object with a weight of 1.71 N on the surface of the moon? ( G = 6.67 × 10 11 Nm 2 /kg 2 ) 3. A spaceship is in orbit around the earth at an altitude of 19,290 km. Which one of the following statements best explains why an astronaut experiences "weightlessness"?
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