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Thermodynamics: Heated Rod

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At 6 degrees Celsius a metal rod is 1.5 m total length with half the length steel and the other half brass. The rod is heated to 150 degrees Celsius. What is the total change in length?

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So we can treat this as two pieces and add the change in L ...

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Example for Laws of Thermodynamics

During the first oil crisis of the early 1970s, a business entrepreneur placed an expensive full-page advertisement in the New York Times, appealing to "the ingenuity of the American people." He offered a cash reward to any inventor who could "raise the temperature of a metal rod by cooling a second rod" and then "generate power by tapping the difference in temperatures."

Use your knowledge of thermodynamics to explain why nobody ever won the reward. Be specific.

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