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1. [-/1 Points] DETAILS WAUNIPHYSAV1 20.P.011. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER An air conditioner expels 4.83 x 105 J of heat to the outside. If the indoor temperature is 18.2C and the outside temperature is 40C calculate the amount of heat the air conditioner removes from inside the house. 2. [-/1 Points] DETAILS WAUNIPHYSAV1 20.P.017. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Determine the efficiency of a Carnot engine if the work it does is 3.67 times less than the heat that flows into the system. % 3. [-/1 Points] DETAILS WAUNIPHYSAV1 20.P.018. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A certain gasoline engine has an efficiency of 37.3%. What would the hot reservoir temperature be for a Carnot engine having that efficiency, if it operates with a cold reservoir temperature of 205.C? OC 4. [-/1 Points] DETAILS WAUNIPHYSAV1 20.P.021. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER The hot and cold reservoirs of a Carnot engine are 273C and 64.2C respectively. The temperature of the hot reservoir is raised by 39C in order to increase the efficiency of the engine. (a) What is the efficiency after the increase in temperature? % (b) Instead of raising the temperature of the hot reservoir, if the temperature of the cold reservoir is decreased by 39C, what would be the efficiency of the engine? %5. [-/1 Points] DETAILS WAUNIPHYSAV1 20.P.023. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER (a) How much heat flows from 1.00 kg of water at 39.2C when it is placed in contact with 1.00 kg of 23C water in reaching equilibrium? (b) What is the change in entropy due to this heat transfer? J / K (c) How much work is made unavailable, taking the lowest temperature to be 23.C? J 6. [-/1 Points] DETAILS WAUNIPHYSAV1 20.P.024.TUTORIAL. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Find the increase in entropy of 3.63 kg of liquid nitrogen that starts at its boiling temperature, boils, and warms to 20.0C at constant pressure. The specific heat of nitrogen gas at constant pressure is 1040 J/(kg . .C), heat of vaporization is 201 kJ/kg, and its boiling point is -195.8.C. J/K 129 Tutorial 7. [-/1 Points] DETAILS WAUNIPHYSAV1 20.P.026. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER When heat is added to a block of ice, it increases its entropy by 35 J/K. If the block has a mass of 0.44 kg, how much of this melts? The latent heat of fusion of ice is 33.4 x 104 J/kg. kg 8. [-/1 Points] DETAILS WAUNIPHYSAV1 20.P.031. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER The temperature of 8.25 moles of a monatomic gas decreases from 71 to 72 during a reversible isovolumetric process. It then undergoes a reversible adiabatic compression until its temperature increases to the original value of 71, while its volume decreases to 1/7 its original volume. What is the total change in entropy? The molar specific heat of the gas at constant volume is 12.5 3/(mol . K). (Assume y = 5/3.) J/K9. [-/1 Points] DETAILS WAUNIPHYSAV1 20.P.032. TUTORIAL. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER 3.00 moles of nitrogen gas undergoes a reversible isobaric expansion where its volume increases such that V = 7.20V;. What is the change in entropy of the gas? The molar specific heat of nitrogen gas is 29.1 3/(mol . K). J/K 129 Tutorial 10. [-/1 Points] DETAILS WAUNIPHYSAV1 20.P.033. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Consider a box with 77 particles. Each one of these particles has as much probability of being in one half of the box as in the other half. Calculate the number of microstates for a possible arrangement of 8 molecules in the left half of the box and 69 molecules in the right half. microstates