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4. (20 points) (a) A steel strip is 30.004 cm long at room temperature (23C). At what temperature would it be exactly 30.000 cm long? 30.00? cm 83,? 30.000 Cm b) A piece of aluminum is welded onto the piece of steel (having the same length at room temperature) forming a bimetallic strip. Fully explain how the strip could function as a switch (making and breaking electrical connections) in a thermostat (drawing a picture could help your explanation)

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. 20 11,1) с 2 3 11.1 11.83 C

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4. (20 points) (a) A steel strip is 30.004 cm long at room temperature (23'C). At...
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