College Physics: Explore And Apply, Volume 2 (2nd Edition)
2nd Edition
ISBN: 9780134862910
Author: Eugenia Etkina, Gorazd Planinsic, Alan Van Heuvelen, Gorzad Planinsic
Publisher: PEARSON
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Textbook Question
Chapter 6, Problem 1RQ
Review Question 6.1 When you burn a log in a fire pit, the mass of wood clearly decreases. How can you define the system so that the mass of the objects in that system remains constant?
Expert Solution & Answer
To determine
The system in which the mass of objects remains constant when a log is burnt in a fire pit and the mass of wood decreases.
Answer to Problem 1RQ
Solution:
The required system can be the fire pit and its surrounding in which the total mass is conserved.
Explanation of Solution
Introduction:
Mass is an example of a conserved quantity. A conserved quantity remains constant in an isolated system, but if the system is not isolated, the quantity might change.
Explanation:
When a log of wood is burnt, the amount of mass that remains, is the same but the solid wood from the log gets converted into smoke and soot. If all the smoke and other gaseous products of the reaction are collected and weighed then it would be exactly equal to the weight of the wood burnt, along with the oxygen consumed during the reaction. Thus, the law of conservation of mass and energy holds true.
Consider the system as fire pit and its surrounding. The burnt log will produce gaseous products and will consume oxygen, which it will take in from the surroundings. Also, the ash formed will remain in the ash pit. Thus, the mass of wood does decrease but it forms gaseous products, uses oxygen and forms ash. But the mass for the considered system, that is fire pit and its surrounding, always remains constant.
Conclusion:
The mass of the system, when a log is burnt, considering the firepit and its surrounding as the system, remains constant.
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Chapter 6 Solutions
College Physics: Explore And Apply, Volume 2 (2nd Edition)
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Ch. 6 - 4. A wagon full of medicine balls is rolling along...Ch. 6 - 5. When can you apply the idea that momentum is...Ch. 6 - 6. Choose an example in which the momentum of a...Ch. 6 - Figure Q6.7 shows the velocity-versus-time graphs...Ch. 6 - Which is a safer car bumper in a collision: one...Ch. 6 - 9. Why does an inflated balloon shoot across a...Ch. 6 - In which situation does the momentum of a tennis...Ch. 6 - 11. A toy car with very low friction wheels and...Ch. 6 - You hold a clay ball above a scale and then drop...Ch. 6 - 13. You hold a rubber ball above a scale and then...Ch. 6 - 14 Two battery-powered fan carts are resting on a...Ch. 6 - 15. According to a report on traumatic brain...Ch. 6 - 16. Jim says that momentum is not a conserved...Ch. 6 - Say five important things about momentum (for...Ch. 6 - Three people are observing the same car. One...Ch. 6 - When would a ball hitting a wall have a greater...Ch. 6 - 20. In the previous question, in which case does...Ch. 6 - 21. 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Drifting space mechanic An astronaut with a...Ch. 6 - Prob. 55PCh. 6 - 56. Rocket stages A 5000-kg rocket ejects a...Ch. 6 - 57. * A rocket has just ejected fuel. With the...Ch. 6 - 58. * Car collision A 1180-kg car traveling south...Ch. 6 - 59. * Ice skaters collide While ice skating, you...Ch. 6 - 1015-kg meteorite traveling at about 10 km/s...Ch. 6 - 61. * Three friends play beach volleyball. 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