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A person fixing a car momentarily leaves one end of an aluminum wrench on a hot part of the engine. The hot part of the wrench is at 100 °C and the room temperature part of the wrench is at 22 °C. The wrench is 0.25 m long and has a (approximately circular) radius of 3.0 cm. Aluminum has a conductivity of 240 J/(s X m x °C) how much heat energy is conducted in the 5.0 seconds the wrench is lying partly on the hot surface?

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