Physics302L - DepartmentofPhysics E302:HeatandCalorimetry...

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MAPUA INSTITUTE OF TECHNOLOGY Department of Physics E302: Heat and Calorimetry XXXXXXXXXXXXX 2005XXXXXX XXXX, Group 1 PHY130L-XX
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XXXXXXX  SAMPLE COMPUTATIONS Part I. Determining the Specific Heat of Metals Given: Solution: Experimental Specific Heat of Metal C T g m g m g m m w c m 0 0 81 8 . 198 47 6 . 31 = = = = ( 29 ( 29 ( 29 ( 29 ( 29 ( 29 % 01 . 17 % % 100 2174 . 0 254380477 . 0 2174 . 0 % % 100 % 254380477 . 0 52 6 . 31 2 1 8 . 198 2 217 . 0 47 0 0 0 0 exp 0 0 0 0 0 exp exp = - - - - = - = - = - + - - = + - = error error error erimental m erimental m m m w w w c c c erimental m x C g cal C g cal C g cal x AV EV AV C g cal C C g C C g cal g C C g cal g C T m T c m T c m C 0 0 0 0 1 29 27 C g cal C C T C T w mix w - = = = C T T C C T T T T T T w c w c w mix w c 0 0 0 0 0 0 0 2 27 29 = = - = = - = = C T C C T T T T m m m mix m 0 0 0 52 81 29 = - = - =
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Part II. Latent Heat of Fusion of Ice Given: Solution: Experimental Latent Heat of Fusion C T g m g m g m i i w c 0 0 0 14 7 . 187 47 = = = = ( 29 ( 29 ( 29 ( 29 ( 29 ( 29 ( 29 % 81 . 3 % % 100 80 9495 . 76 80 % % 100 % 9495 . 76 14 22 1 14 7 1 7 . 187 7 217 . 0 47 0 0 0 0 exp 0 0 0 0 0 0 exp exp = - - - - = - = - = - + - - + - - - = + + - = - error error error erimental f erimental f i water ice w i w w w c c c erimental f x C g cal C g cal C g cal x AV EV AV C g cal L g C C g cal g C C g cal g C C g cal g L m T c m T c m T c m L 0 0 0 0 1 22 29 C g cal C C T C T w mix w - = = = C T T C C T T T T T T w c w c w mix w c 0 0 0 0 0 0 0 7 29 22 - = = - = = - = = C T C C T T T T water ice water ice w mix water ice 0 0 0 0 22 0 22 = - = - = - - -
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GUIDE QUESTIONS Part I. 1. Express equation 1 in terms of mass, specific heats, final and initial temperature. ( 29 ( 29 i f i f gained loss T T T mc T T mc T mc T mc Q Q - = - = =
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2. Why is it important to immerse the metal in the boiling water for a long time?  What happens if the metal was immersed only for a short while? It is important to immerse the metal in boiling water for a long time in order  for the metal to attain thermal equilibrium, If the metal was immersed only for a  short while the initial temperature of the metal would have been false.
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