1. +0/1 points Previous Answers OSColPhys2016 15.1.P003 My Notes Ask k Your Teac

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1. +0/1 points Previous Answers OSColPhys2016 15.1.P003 My Notes Ask k Your Teacher A system does 2.00 × 10s of work while 6.20 × 108 J of heat transfer occurs to the environment what is the change in interna energ other changes (such as in temperature or by the addition of fuel)? (Include the sign of the value in your answer.) in ofthe system assuming no Additional Materials Reading Submit Answer Save Progress Practice Another Version 2. +-1 points OSColPhys2016 15.1.P.004. My Notes Ask Your Teacher what is the change in internal energy (in ]) of a system that does 4.50 x 105 J of work while 2.60 x 10 transfer occurs to the environment? of heat transfer occurs into the system, and 6.00 x 106 ) of heat Additional Materials Reading 3.+-1 points OSColPhys2016 15.4.P 028 My Notes As k Your Teacher A certain gasoline engine has an efficiency of 36.0%, what would the hot reservoir temperature (in °C) be for a Carnot engine having that efficiency, if it operates with a cold reservoir temperature of 210°C? oC

Explanation / Answer

1)

change in internal energy = heat given to system - work done by system

change in internal energy = -6.2 *10^8 - 2 *10^8

change in internal energy = -8.2 *10^8 J

2)

change in internal energy = heat given to system - work done by system

change in internal energy = 2.6 *10^6 - 6 *10^6 - 4.5 *10^5

change in internal energy = -3.85 *10^6 J

change in internal energy is -3.85 *10^6 J

3)

as efficiency = 1 - Tc/Th

0.36 = 1- (210 + 273)/(Th + 273)

solving for Th

Th = 481.7 degree C

the hot reservoir is 481.7 degree C

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