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Unformatted text preview: (2 pts) 12. The figure shows a car (represented by a dot) moving clockwise (to the right, at the instant shown) at constant speed over the top of a circular hill. a. On the diagram, carefully drawand label vectors which represent the car’s velocity, the car’s acceleration, and the net force on the car at the instant shown. Or, if any of these are zero, say so. (3 pts) b. Is the magnitude of the normal force of the road on the car greater than, less than, or equal to the weight of the car? Explain your reasoning. (2 pts) 13. A 1.0‐kg toy car moves at a constant speed of 2.0 m/s in a horizontal circle of radius 0.50 m. a. Determine the centripetal force that acts on the car. (2 pts) b. What can you say (quantitatively) about the coefficient of static friction between the tires and the road? (2 pts) Name__________________________________ 14. A 2.0-m-long airplane propeller is free to rotate about an axis through its
center. A 400 N force is applied to the propeller as shown. The moment of inertia
of the propeller is 20 kg•m2. Find the angular acceleration of the propeller. (For full credit your solution must include a solution beginning from fundamental equations, proper units and significant figures.) (8 pts) 60°
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This note was uploaded on 09/15/2013 for the course PHYS 111 taught by Professor Cui during the Fall '07 term at UMBC.
- Fall '07