Materials Science And Engineering
Materials Science And Engineering
10th Edition
ISBN: 9781119405498
Author: Callister, William D., Jr, RETHWISCH, David G., Jr., 1940- Author.
Publisher: Wiley,
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Chapter 22, Problem 2DP
To determine

To discuss:

The importance of the total life cycle of the materials (product) rather than considering the first stage only.

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An evening meal is being prepared in a home kitchen containing an electric oven and a microwave oven.  The cost for electricity in the home's neighborhood is $0.15 per kilowatt hour.  The microwave oven is specified as a 1000 watt unit, while the oven requires 240 volts and uses a current of 30 amperes to cook at 350 degrees Fahrenheit.  A frozen meal can be cooked in the microwave oven set on full power in 10 minutes.  The same frozen meal cooked in the electric oven set for 350 degrees F takes 40 minutes. (a) How much energy does it take to cook the frozen meal in the microwave at full power and how much does it cost? (b) How much energy does it take to cook the frozen meal in the electric oven at 350 degrees Fahrenheit and how much does it cost?
Water is boiling in a 25 cm diameter aluminum pan (k=237 W/mK) at 95 degrees C. Heat is transferred steadily to the boiling water in the pan through its .5 cm thick flat bottom at a rate of 800 W. if the inner surface temp of the bottom of the pan is 108 degrees C determine the boiling heat transfer coefficent on the inner surface of the pan and the outer surface temp of the bottom of the pan.

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Materials Science And Engineering

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