Objective: SWBAT determine the efficiency of a heat engine.
Warm Up: Yesterday was a commuters nightmare in DC because the cold weather cracked some of the rails on one of the metrorail lines. Calculate the thermal contraction of a 20 m long steel metrorail line (whose coefficient of thermal expansion is 12 x 10^6) if the temperature drops from 32 oF to 12 oF.
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