|May3-06, 02:05 PM||#1|
Specific Heat Capacity Problem.(Please check.)
This is CALORIMETRY PROBLEM.
A 0.050kg metal bolt is heated to an unknown initial temperature. It is then dropped into a beaker containing 0.15kg of water with an initial temperature of 21.0 C. The bolt and metal then reach a final temperature of 25.0 C. If the metal has a specific heat capacity of 899 J/kg*C, find the initial temperature of the metal.
the solution is:
Change in Temp of metal = (C of water *mass of water* Change in temp of water)/(C of metal*mass of metal)
Change of temp. of metal = [(4186 J/kg*C)(0.15kg)(25C-21C)]/[(899 j/kg*C)(0.050kg)
Change of temp. of metal = 55.87C
Change in temperature = Final Temperature-Initial Temperature
Initial Temperature = Final Temp.-Change in Temp
i want to ask why is the answer +80.87C from the book, instead of -30.87C?
i hope you could explain so i can also explain it to my students. is the sign of the answer has something to do with the HEAT REMOVAL and HEAT ABSORPTION?
|May3-06, 02:45 PM||#2|
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Change in Temp of metal = - (C of water *mass of water* Change in temp of water)/(C of metal*mass of metal)
|May3-06, 05:38 PM||#3|
thanks for the reply.
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