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Unformatted text preview: PHY53 F05 FINAL Name: Section: (I certify I have abided by the Duke Honor Code) Scores: MC Prob. 1 Prob. 2 Prob. 3 Prob. 4 Prob. 5 Prob. 6 TOTAL (50 pts) (20 pts) (25 pts) (25 pts) (25 pts) (22 pts) (33 pts) (200 pts) In questions or problems not requiring numerical answers, express your answers in terms of the symbols given, and standard constants such as g. Where numerical answers are required use g = 10 m / s 2 . For the long problems include clear explanations of your reasoning and working to obtain full credit. Enter your multiple choice answers in the boxes provided below: MC 1 MC 2 MC 3 MC 4 MC 5 MC 6 MC 7 MC 8 MC 9 MC 10 Multiple Choice (5 points each) 1. Which object arrives first at the bottom of a 30 degree incline, if they are all released from rest at the same time: A) A solid disk of mass m rolling down without slipping. B) A hollow cylinder of mass m rolling down without slipping. C) A solid disk of mass m flat on its side gliding down with a coefficient of kinetic friction μ = 0 . 3. D) A solid cube of mass 2 m gliding down on one of its sides with a coefficient of kinetic friction μ = 0 . 3. E) A hollow cylinder of mass m/ 2 rolling down without slipping. 2. Several identical objects are thrown out of a 45 m high window of a highrise building. Which one has the greatest speed when it arrives at the ground? [Neglect air resistance.] A) An object that is dropped from rest. B) An object that is thrown straight up with initial velocity of 2 m/s. C) An object that is thrown out horizontally with initial velocity of 2 m/s. D) An object that is thrown straight down with initial velocity of 2 m/s. E) An object that is thrown at a upward angle of 45 degrees with initial velocity of 2 m/s. 3. A stuntman jumps straight down from a bridge into the saddle of a running horse in a Western movie. If the mass of the stuntman is 60 kg and the horse is seen to slow down by 10 percent upon impact, what is the weight of the horse? A) 600 kg B) 1200 kg C) 300 kg D) 660 kg E) 540 kg 4. A bicycle rider tries to navigate a slippery curve on a wet road. In order to get through the curve safely, she needs to: A) Lean more strongly to the side than she would if the road were dry....
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 Fall '07
 Mueller
 Physics, Energy, Mass, initial velocity, Neglect air resistance, freezing point temperature

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