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Unformatted text preview: kissner (elk527) – More Forces – marcil – (AII) 1 This print-out should have 22 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 5.0 points A firefighter of mass 72 kg slides down a ver- tical pole with an acceleration of 5 m / s 2 . The acceleration of gravity is 10 m / s 2 . What is the friction force that acts on him? Answer in units of N 002 5.0 points The strength of the gravitational force be- tween objects depends on 1. the mass of each object. 2. the distance between the objects. 3. the mass of each object and the distance between them. 4. neither the masses nor the distance be- tween them. 003 5.0 points In introductory physics laboratories, a typical Cavendish balance for measuring the gravita- tional constant G uses lead spheres of masses 2 . 21 kg and 22 . 2 g whose centers are separated by 5 . 22 cm. Calculate the gravitational force between these spheres, treating each as a point mass located at the center of the sphere. The value of the universal gravitational constant is 6 . 67259 × 10- 11 N · m 2 / kg 2 . Answer in units of N 004 5.0 points Why is the linear speed greater for a horse on the outside of a merry-go-round than for a horse closer to the center? 1. None of these 2. The horse on the outside has longer legs. 3. The tangential speed of the horse is di- rectly proportional to the distance from the center. 4. The outside horse moves easier. 5. The horse on the outside is larger. 6. The horse on the outside feels less force from the merry-go-round. 005 5.0 points Before going into orbit, an astronaut has a mass of 55 kg. When in orbit, a measurement determines that a force of 69 . 3 N causes her to move with an acceleration of 1 . 1 m / s 2 ....
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This note was uploaded on 11/09/2011 for the course ECON 103 taught by Professor Dr.roser during the Spring '11 term at Florida Memorial.
- Spring '11