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A 269 kg cast-iron car engine contains water as a coolant. Suppose the engine’s temperature is...

A 269 kg cast-iron car engine contains water as a coolant. Suppose the engine’s temperature is 31◦C when it is shut off and the air temperature is 9 ◦C. The heat given off by the engine and water in it as they cool to air temperature is 4.8 × 106 J. What mass of water is used to cool the engine? The specific heat of water is 4180 J/kg · ◦C and of iron 450 J/kg · ◦C. Answer in units of kg.

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