EBK THINKING LIKE AN ENGINEER
4th Edition
ISBN: 8220103633512
Author: OHLAND
Publisher: PEARSON
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Textbook Question
Chapter 5.7, Problem 3CC
In each of the following cases, a value of the desired quantity has been determined in some way, resulting in a number displayed on a calculator or computer screen. Your task is to round each number to a reasonable number of significant digits—up if a higher value is conservative, down if a lower value is conservative, and to the nearest value if it does not make a difference. Specify why your assumption is conservative.
| (a) | The mass of an adult human riding on an elevator | 178.8 pounds |
| (b) | The amount of milk needed to fill a cereal bowl | 1.25 cups |
| (c) | The time it takes to sing Happy Birthday | 32.67 seconds |
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During some actual expansion and compression processes in piston–cylinder devices, the gases have been observed to satisfy the relationship PVn = C, where n and C are constants. Calculate the work done when a gas expands from 350 kPa and 0.03 m3 to a final volume of 0.2 m3 for the case of n = 1.5.
The work done in this case is kJ.
Carbon dioxide contained in a piston–cylinder device is compressed from 0.3 to 0.1 m3. During the process, the pressure and volume are related by P = aV–2, where a = 6 kPa·m6. Calculate the work done on carbon dioxide during this process.
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The work required to compress helium is kJ.
Chapter 5 Solutions
EBK THINKING LIKE AN ENGINEER
Ch. 5.6 - Determine the number of significant figures and...Ch. 5.6 - Express the answer to the following, using the...Ch. 5.7 - In each of the following cases, a value of the...Ch. 5.8 - Prob. 4CCCh. 5 - a. If estimating the amount of time to design a...Ch. 5 - In each of the following cases, either display a...Ch. 5 - In each of the following cases, either display a...Ch. 5 - In each of the following cases, a value of some...Ch. 5 - Complete the table to express each of the...Ch. 5 - Use estimation to solve these Fermi-type problems....
Ch. 5 - 2. How many gallons of gasoline are burned per...Ch. 5 - 3. If all the land (both currently inhabited and...Ch. 5 - 4. How many times do my rear tires rotate if I...Ch. 5 - 5. How many gallons of water per day would be...Ch. 5 - 6. In 1978, cars that got about 40 miles per...Ch. 5 - 7. How many toothpicks can be made from an...Ch. 5 - 8. Noahs ark has been described as having the...Ch. 5 - Prob. 9RQCh. 5 - 10. A cubic meter of air has a mass of about 1.2...Ch. 5 - 11. How many carrots are used to make all of the...
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