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Unformatted text preview: bello (rtb473) – hw3 – Demkov – (59910) 1 This printout should have 52 questions. Multiplechoice questions may continue on the next column or page – find all choices before answering. 001 10.0 points The standard of time is based on 1. the daily rotation of the earth. 2. the frequency of light emitted by 86 Kr. 3. a precision pendulum clock. 4. None of these correct 5. the yearly revolution of the earth about the sun. Explanation: The second is defined from oscillations of cesium133 atoms. 002 10.0 points What is not an element? 1. hydrogen 2. water correct 3. oxygen 4. None of these 5. carbon Explanation: Water is the compound H 2 O, composed of hydrogen and oxygen atoms. 003 10.0 points In one scene in the movie The Godfather II , a solid gold phones is passed around a large table for everyone to see. Suppose the volume of gold in the phone was equal to the volume of 10centimeter cube of gold. The density of gold is 19,300 kg/m 3 . Could such a phone be casually passed around a table from hand to hand? What is the weight of the phone? 1. Yes; it weighs about 9 lbs. 2. No; it weighs about 45 lbs. correct 3. Yes; it weighs about 4.5 lbs. 4. No; it weighs about 90 lbs. Explanation: One cubic meter of gold has a mass of about 20,000 kg, which is roughly 45,000 pounds. A ten centimeter cube of gold is about 45 pounds. It would be difficult to pass around this phone. 004 (part 1 of 3) 10.0 points A solid aluminum cube has sides each of length L . A second cube of the same ma terial has sides four times the length of the first cube, i.e. , 4 L . Compared to the first cube, the density of the second cube is 1. eight times as much as the first cube. 2. None of these 3. sixteen times as much as the first cube. 4. the same as the first cube. correct 5. four times as much as the first cube. 6. twentyfour times as much as the first cube. 7. nine times as much as the first cube. 8. two times as much as the first cube. 9. twentyseven times as much as the first cube. 10. sixtyfour times as much as the first cube. Explanation: Density is defined as mass per unit volume and therefore is a property of the material, in bello (rtb473) – hw3 – Demkov – (59910) 2 this case aluminum, not the shape or size and so remains the same. 005 (part 2 of 3) 10.0 points Compared to the first cube, the weight of the second cube is 1. sixteen times as much as the first cube. 2. sixtyfour times as much as the first cube. correct 3. eight times as much as the first cube. 4. twentyseven times as much as the first cube. 5. twentyfour times as much as the first cube. 6. the same as the first cube. 7. None of these 8. four times as much as the first cube. 9. nine times as much as the first cube....
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This note was uploaded on 11/10/2008 for the course PHY 301 taught by Professor Swinney during the Spring '07 term at University of Texas at Austin.
 Spring '07
 Swinney
 mechanics

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