P140_E3_F04 - Physics 140 Fall 2004 Exam#3 Please print your name Please list your discussion section number Please list your discussion instructor

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Physics 140 Fall 2004: Exam #3 Please print your name:_____________________________________________ Please list your discussion section number:______________________________ Please list your discussion instructor:___________________________________ Form #1 Instructions Fill in your name above 1. This will be a 1.5 hour, closed book exam. The exam includes 20 questions. 2. You may use a calculator, please do not share calculators 3. You may use three 3”x5” note card with notes and equations you think may be useful. You can write on both sides of the card if you like. 4. You will be asked to show your University student ID card when you turn in your exam.
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1: A physics 140 student sits in a boat floating on a lake. She is wearing a life preserver. There is a heavy metal anchor and an empty metal bucket in the boat. Oddly enough, a string attached to a helium balloon is tied onto the boat. To win a bet with her physics professor, she needs to find a way to make the water level in the lake rise . Which of the following actions will accomplish her goal? a) Jump overboard, so that her life preserver allows her to float b) Throw the anchor overboard, so that it sinks to the bottom c) Cut the string, allowing the helium balloon to float up and away d) Fill a bucket with water and place it in the boat e) None of these actions will work; she’s going to lose the bet 2: Consider a variation of the hydraulic press. A plastic bag is placed between a 1m by 2m rectangular board and the floor. Hugo sits in a chair which is placed on the board. Their combined mass is 125 kg. Another student, Graziella, then inflates the bag through a straw which has a 0.5 cm diameter. With what force must Graziella blow air into the straw if she is to lift Hugo, the chair, and the board upward? Assume that air is a nice, incompressible fluid for this problem. a) 0.012 N b) 52.1 N c) 13.6 N d) 4.9 N e) 1.1 N F
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enter the submarine? Assume the air pressure inside the submarine is the same as atmospheric pressure at sea level. a) 4.2 m/s b) 8.4 m/s c) 12.1 m/s d) 24.2 m/s e) 68.6 m/s 4: A group of 5 children want to build a raft to use on a lake. They have a set of logs, each of which has a volume of 0.25m 3 . If the density of wood is 800 kg/m 3 , and each child weighs 45 kg, what is the smallest number of logs they must tie together into a raft to avoid getting their feet wet? a)
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This note was uploaded on 04/02/2008 for the course PHYSICS 140 taught by Professor Evrard during the Spring '07 term at University of Michigan.

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P140_E3_F04 - Physics 140 Fall 2004 Exam#3 Please print your name Please list your discussion section number Please list your discussion instructor

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