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Exam 1 Practice

# Exam 1 Practice - huynh(hph268 Exam 1 Practice clark(56485...

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huynh (hph268) – Exam 1 Practice – clark – (56485) 1 This print-out should have 27 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points Consider two identical metal bottles A and B that can be used to hold compressed gases. A is filled with air at atmospheric pressure, and B is completely evacuated. Which bottle is denser? 1. A 2. B 3. Unable to determine 4. Densities are the same. 002 10.0 points When an object falls through air, there is a drag force ( with dimension M · L / T 2 ) that depends on the product of the surface area of the object and the square of its velocity; i.e. , F air = C A v 2 , where C is a constant. What is the dimension for constant C ? 1. [ C ] = M T · L 2 2. [ C ] = M T 2 · L 2 3. [ C ] = T M 4. [ C ] = M L 2 5. [ C ] = T 2 · L 2 M 6. [ C ] = M L 3 7. [ C ] = T 2 · L M 8. [ C ] = T · L M 9. [ C ] = T · L 2 M 10. [ C ] = M T 003 10.0 points The average person burns up approximately 5 cals/min during exercise while gaining 100 cals from the post exercise snack. Dieticians recommend 30 minutes of exercise and one snack daily. Using this information, provide an order of magnitude estimate of the net caloric change every day in all the health-conscious citizens in a city like Austin (population 7 × 10 5 ). 1. 10 4 kcals 2. 10 kcals 3. 10 4 kcals 4. 10 kcals 5. 10 7 kcals 6. Cannot be estimated 7. 10 7 kcals 004 (part 1 of 3) 10.0 points There are roughly 10 59 neutrons and protons in an average star and about 10 11 stars in a typical galaxy. Galaxies tend to form in clus- ters of (on the average) about 10 3 galaxies, and there are about 10 9 clusters in the known part of the Universe. Approximately how many neutrons and protons are there in the known Universe? 1. n 10 52 2. n 10 87 3. n 10 82 4. None of these 5. n 10 47 6. n 10 43

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huynh (hph268) – Exam 1 Practice – clark – (56485) 2 005 (part 2 of 3) 10.0 points Suppose all this matter were compressed into a sphere of nuclear matter such that each nuclear particle occupied a volume of 1 . 401 × 10 - 45 m 3 (which is approximately the “volume” of a neutron or proton). What would be the radius of this sphere of nuclear matter?
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