(10%) Problem 1: People that live at high altitudes often notice that sealed bags of food are puffed up because the air

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10 Problem 1 People That Live At High Altitudes Often Notice That Sealed Bags Of Food Are Puffed Up Because The Air 1 (93.97 KiB) Viewed 44 times

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(10%) Problem 1: People that live at high altitudes often notice that sealed bags of food are puffed up because the air inside has expanded since they were sealed at a lower altitude. In one example, a bag of pretzels was packed at a pressure of 1.00 atm and a temperature of 22.5°C. The bag was then transported to Santa Fe. The sealed bag of pretzels then finds its way to a summer picnic where the temperature is 30.4 °C, and the volume of air in the bag has increased to 1.38 times its original value. At the picnic in Santa Fe, what is the pressure, in atmospheres, of the air in the bag? atm Grade Summary Deductions Potential 100% P2 =
(10%) Problem 6: A copper chunk with a mass mcopper = 2.75 kg has a change of temperature due to the addition of heat. A sample of water of unknown mass has an identical change of temperature as the copper chunk when an identical amount of heat is added to it. Determine the mass, in kilograms, of the water sample. mwater kg Grade Summa Deductions Potential
(10%) Problem 10: A heat engine operating at steady state delivers a power output of 18.5 hp. The engine receives energy by heat transfer in the amount of On= 24.5 kJ during cach cycle of operation from a high temperature thermal reservoir at Th= 840 K. The system is executing 50 cycles per minute. 33% Part (a) Determine the amount of work that is delivered during each cycle in kilojoules. W cycie = 16.5612 cycle = 16.56 ✓ Correct! 33% Part (b) Determine the actual efficiency at which the system is operating. Nacı = 0.6759 ✓ Correct! 33% Part (c) Assuming this engine is as efficient as possible, what would the temperature, in degrees celsius, of the colder reservoir be? Grade Summary Tc = -0.756 Deductions Potential 10