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PHYS 122 Final exam practice problems

PHYS 122 Final exam practice problems - Phys 122 College...

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Phys 122 – College Physics II Exam Practice Due: 26 November 2007 1. If you blow across the top of a sheet of paper, the paper will lift due to Bernoulli’s Principle. a) Find the pressure difference above and below the paper when air flows over the upper surface with a speed of 1. 5 m/s. b) If the area of the paper is 6.03x10 -2 m 2 , what is the net upward force exerted on the paper? 2. a) Estimate the number of air molecules in a room 20 m on a side. (Hint: Make reasonable assumptions about the temperature and pressure in the room.) M. Ouellette, 7 May 2009 Page 1 of 7
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b) What is the average speed of an air molecule in this room? The mass of a nitrogen molecule is 4.68x10 -26 kg. M. Ouellette, 7 May 2009 Page 2 of 7
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3. An organ to be used in a transplant is packed in 3 kg of ice at 0.0°C. The ice is in a fiberboard box of walls 5 cm thick. Fiberboard has a thermal conductivity of 0.059 W/( m·K). The surface area of the cooler is 1. 5 m 2 and it rests in the shade where the air temperature is 18°C. In the following questions, ignore the
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