# hw3 - obennoskey(blo242 – hw3 – Demkov –(59910 1 This...

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Unformatted text preview: obennoskey (blo242) – hw3 – Demkov – (59910) 1 This print-out should have 52 questions. Multiple-choice 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 yearly revolution of the earth about the sun. 2. the frequency of light emitted by 86 Kr. 3. None of these correct 4. a precision pendulum clock. 5. the daily rotation of the earth. Explanation: The second is defined from oscillations of cesium-133 atoms. 002 10.0 points What is not an element? 1. carbon 2. water correct 3. hydrogen 4. oxygen 5. None of these 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 10-centimeter 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 4.5 lbs. 2. No; it weighs about 90 lbs. 3. No; it weighs about 45 lbs. correct 4. Yes; it weighs about 9 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 three times the length of the first cube, i.e. , 3 L . Compared to the first cube, the density of the second cube is 1. sixteen times as much as the first cube. 2. sixty-four times as much as the first cube. 3. eight times as much as the first cube. 4. None of these 5. twenty-four times as much as the first cube. 6. nine times as much as the first cube. 7. four times as much as the first cube. 8. two times as much as the first cube. 9. the same as the first cube. correct 10. twenty-seven 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 obennoskey (blo242) – 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. sixty-four times as much as the first cube. 2. eight times as much as the first cube. 3. twenty-seven times as much as the first cube. correct 4. two times as much as the first cube. 5. nine times as much as the first cube. 6. four times as much as the first cube. 7. sixteen times as much as the first cube. 8. twenty-four times as much as the first cube....
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hw3 - obennoskey(blo242 – hw3 – Demkov –(59910 1 This...

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