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Homework answers / question archive / 1)How much heat energy (Q) is required to heat 2 kg of copper from 30 o 2)A 125 gram glass mug at 20 ooo Cto 80

1)How much heat energy (Q) is required to heat 2 kg of copper from 30 o 2)A 125 gram glass mug at 20 ooo Cto 80.0 ^{o}C? Remember, there are 1000 grams in a kilogram! Copper specific heat capacity= 0.385 C is filled with 200.0 grams of coffee at 90 C. The final temperature of the coffee and mug reaches 83C. Assuming that all heat lost by the coffee is transferred to the mug, what is the specific heat value for the coffee? Specific heat value for glass= 0.840

3) A steel bridge is 500.0 m long when the temperature is 25.00 ^{O}C. What is the length on a cold day when the temperature is minus 20.0 ^{o}C? The coefficient of expansion for steel is 12 * 10^{-6}.

4)A rod 1.0 m in length, expands by 0.50 mm when heated from 20 ^{o}C to 84 ^{o}C. What is the coefficient of expansion of the material from which the rod is made?