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lecture34_mwf_2101_S11

# lecture34_mwf_2101_S11 - PHYS 2101 Spring 2011 1...

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PHYS 2101 1. Thermodynamic Processes A. Isobaric B. Isochoric C. Isothermal D. Adiabatic 2. Ideal Gas Law Spring 2011

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PHYS 2101 EX1: How much water initially at 80° C needs to be added to 1.5 kg of ice initially at -10° C so that all of it ends up as water at 20° C? Spring 2011
PHYS 2101 All the ice melts: Q water T f Q melts Q ice 0 f T ice Q T i , ice T i , water T f Q ice 0 + Q melts + Q ice ( water ) T f + Q water T f = 0 Q water 0 Q water 0 Q ice 0 Q water 0 Q ice 0 + Q melts 0 ) ( ) 0 ( ) 0 ( , , = - + - + + - water i f w w f w i f i ice i i i T T c m T c m L m T c m water i water f water a ice water to ice ice ice i T T T , s , 0 0   → Spring 2011

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PHYS 2101 Some of the ice melts: Q water 0 Q all melts Q ice 0 T i , ice T i , water T f Q ice 0 + Q melts + Q water 0 = 0 Q melts Q water 0 Q ice 0 Q water 0 < Q ice 0 + Q all melts 0 ) ( ) 0 ( , , = - + + - water i f w w f melt ice i i i T T c m L m T c m water i water water to ice ice ice i T T , , 0 0   → Spring 2011
PHYS 2101 Some of the water freezes: Q water 0 Q all freezes Q ice 0 T i , ice T i , water T f Q ice 0 + Q freezes + Q water 0 = 0 Q freezes Q ice 0 Q water 0 Q ice 0 < Q water 0 + Q all freezes 0 ) 0 ( ) 0 ( , , = - + - - water i w w f freeze ice i i i T c m L m T c m water i water ice to water ice ice i T T , , 0 0   → Spring 2011

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PHYS 2101 All the ice melts: Q ice T f Q freezes Q water 0 Q water T f T i , ice T i , water T f Q ice T f + Q water 0 + Q freezes + Q water ( ice ) T f = 0 Q ice 0 Q ice 0 Q water 0 Q ice 0 Q water 0 + Q all freezes 0 ) 0 ( ) 0 ( ) ( , , = - + - - + - water i w w f w f i w ice i f i i T c m L m T c m T T c m water i water ice to water ice as water f
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