Physics for Scientists and Engineers
9th Edition
ISBN: 9781133947271
Author: Raymond A. Serway, John W. Jewett
Publisher: Cengage Learning
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Textbook Question
Chapter 8, Problem 8.1QQ
By what transfer mechanisms does energy enter and leave (a) your television set? (b) Your gasoline-powered lawn mower? (c) Your hand-cranked pencil sharpener?
(a)
Expert Solution
To determine
The energy transfer mechanism by which energy enter and leave the television set.
Answer to Problem 8.1QQ
The energy enters in the form of electrical energy, electromagnetic radiation and energy leaves in the form of heat, mechanical waves and electromagnetic radiation.
Explanation of Solution
In the television set, the energy enters in the form of electrical energy for the power and in the form of the electromagnetic radiation for the signal purpose.
The energy leaves by the television in different forms. First type of the energy is left in the form of the heat from the hot surfaces of the television into the air, second type of the energy is left in the form of mechanical waves as sound from the speaker and third type of energy form is left in the form of electromagnetic radiation from the television screen.
Conclusion:
Therefore, the energy enters in the form of electrical energy, electromagnetic radiation and energy leaves in the form of heat, mechanical waves and electromagnetic radiation.
(b)
Expert Solution
To determine
The energy transfer mechanism by which energy enter and leave the gasoline-powered lawn mower.
Answer to Problem 8.1QQ
The energy enters in the form of fuel energy and energy leaves in the form of heat, mechanical waves and work.
Explanation of Solution
In the gasoline-powered lawn mower, the energy enters in the form of fuel energy by using gasoline for the power.
There are three main ways in which the energy leaves the gasoline-powered lawn mower. The energy leaves in the form of the heat from the hot surfaces into air, in the form of mechanical waves as sound and in the form of work on the blades of the grass cutter.
Conclusion:
Therefore, the energy enters in the form of fuel energy and energy leaves in the form of heat, mechanical waves and work.
(c)
Expert Solution
To determine
The energy transfer mechanism by which energy enter and leave the hand-cranked pencil sharpener.
Answer to Problem 8.1QQ
The energy enters in the form of work in turning the crank and energy leaves in the form of work done on the pencil and mechanical waves as sound.
Explanation of Solution
In the hand-cranked pencil sharpener, the energy enters in the form of the form of work in turning the crank by hand.
There are two main ways in which the energy leaves the hand-cranked pencil sharpener. The energy leaves in the form of mechanical waves as sound from and in the form of work done on the pencil.
Conclusion:
Therefore, the energy enters in the form of work in turning the crank and energy leaves in the form of work done on the pencil and mechanical waves as sound.
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Chapter 8 Solutions
Physics for Scientists and Engineers
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Ch. 8 - In a laboratory model of cars skidding to a stop,...Ch. 8 - What average power is generated by a 70.0-kg...Ch. 8 - A ball of clay falls freely to the hard floor. 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It moves...Ch. 8 - Prob. 8.39PCh. 8 - Energy is conventionally measured in Calories as...Ch. 8 - A loaded ore car has a mass of 950 kg and rolls on...Ch. 8 - Make an order-of-magnitude estimate of your power...Ch. 8 - A small block of mass m = 200 g is released from...Ch. 8 - Prob. 8.44APCh. 8 - Review. A boy starts at rest and slides down a...Ch. 8 - Review. As shown in Figure P8.26, a light string...Ch. 8 - A 4.00-kg particle moves along the x axis. Its...Ch. 8 - Why is the following situation impossible? A...Ch. 8 - A skateboarder with his board can be modeled as a...Ch. 8 - Heedless of danger, a child leaps onto a pile of...Ch. 8 - Jonathan is riding a bicycle and encounters a hill...Ch. 8 - Jonathan is riding a bicycle and encounters a hill...Ch. 8 - Consider the blockspringsurface system in part (B)...Ch. 8 - As it plows a parking lot, a snowplow pushes an...Ch. 8 - Prob. 8.55APCh. 8 - Prob. 8.56APCh. 8 - As the driver steps on the gas pedal, a car of...Ch. 8 - Review. 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