Two parallel surfaces are separated by 1 m. One of the surfaces has a temperature of 177ºC and the other surface is 27ºC. A heat shield is placed midway between the two surfaces. Estimate the shield temperature.
What will be an ideal response?
One can use an arithmetic average of the temperatures to arrive at a rough estimate of the shields temperature.
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How old is the Universe since the big bang? Pick the best answer according to radioactive dating in the solar system, light travel times to most distant galaxies, time reversal of the big bang, and observations of the 3-K radiation
a. 1400 years b. 14,000 years c. 14,000,000 years d. 14,000,000,000 years
Discuss the evidence we have that the surface of Venus is marked by volcanism
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What is "ice geology"? Give an example illustrating why it is important in the outer solar system
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The first evidence for electromagnetic waves came from
A) Marconi's experiment in which sound waves were sent from a vibrating membrane in one city and received by a similar device in another city. B) Heinrich Hertz's experiments in which electrons jumped back and forth across a gap in an electric circuit and EM waves were detected at some distance from the gap. C) Marconi's experiment in which radio waves were sent from a piece of vibrating crystal in one city and received by a similar device in another city. D) Heinrich Hertz's experiments in which electric charge was placed on small wooden rod and set into rapid vibration; EM waves were detected by a second wooden rod at some distance from the first rod. E) Maxwell's experiments in which magnetic effects were demonstrated to result from the current in electrical circuits.