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PHY053 F05 Exam2a

# PHY053 F05 Exam2a - PHY53 F-05 Exam 2 A Name Section I...

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PHY53 F-05 Exam 2 A Name: _______________________ Section: __ I certify that I have abided by the rules and the spirit of the Duke Community Standard. Grading scores: MC ____ P1 ____ P2 ____P3 ____ Total: ______ In questions or problems not requiring numerical answers, express your answers in terms of the symbols given, and standard constants such as g. If numbers are required, use g = 10 m/s 2 . Record your MC answers: MC1___ MC2___ MC3___ MC4___ MC5___ MC6___ Multiple Choice: 4 Points Each 1. The driver of a car of mass 1200 kg encounters a speed hump on a level road. If the curvature radius of the hump is 15 m, what is the fastest speed at which she can drive over the hump without making the car lift off the road? A) 31.2 km/h B) 41.7 km/h C) 44.1 km/h D) 54.0 km/h E) 62.4 km/h. 2. A race car can accelerate from rest to 30 m/s in 4.6 s. If the power output of the car remains constant, how long does it take the car to accelerate from 30 m/s to 60 m/s? [Neglect air drag.] A) 4.6 s. B) 6.5 s. C) 9.2 s. D) 13.8 s. E) 18.4 s. 3. Which of the following objects reach the bottom of a 30 ° incline in the shortest time, if they are released from rest at the top and roll downhill without slipping: A) A solid disk rolling downhill.

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