PHY3209: Exercise 1 An ofice worker claims that a cup of cold coffee on his tabl
ID: 1583297 • Letter: P
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PHY3209: Exercise 1 An ofice worker claims that a cup of cold coffee on his table warmed up to 80"C by picking up energy from the surrounding air, which is at 26 C. is there any ruth to his claim? Does this process violate any thermody 2. What is the diflerence between the dlassical and the statisical approaches to thermodynamics? 3. What is the net force acing on a car cruising at a constant velocity of TO kmh (a) on a level road and (b) on an uphill soad? 4.At 45 lattude, the gravitatonal acceleration as a function of elevation z above sea level is given by g a bz where au 9.807 m/ and b 332 x 10 s Deiemine the height above sea level where the weight of an object will decrease by 03 percent Answer: 8362 m 5. The constare-pressure specific heat of air at 25'C is 1.005kig C. Express this value in kkgkJg"C 6.A large raction of the themal energy generated in the engine of a car is rejecled to the air by the radiator through the croulating water Should the radator be analyzed as a closed system or as an open system? Explain 7. A can of soft drink at room temperature is put into the retrigerator so that it willcool Would you model the can of soft drink as a closed system or as an open system? Explain . Deine the isothermal, isobaric, and isochoric processes 9. The temperature of a system drops by 45-F during a cooling process. Express this drop in temperature in K,R,and , 10. Explain why some people experience nose bleeding and some others experience shortness of breath at high elevations Atention: Saudents are required to pass up solution for question number with an asteriskExplanation / Answer
1 Ans: According to second law of Thermo dynamics(clausius statement) "Heat can never transmit from colder to warmer object without doing any external work on it".
So, the claim is a fake one. And the claim violates second law of thermodynamics.
2 Ans: Classical thermodynamis, The state of a thermodynamical system can be explained by the practical observations of macroscopic variables like pressure, volume and temperature etc.
In statistical approach the state of the system is explained by microscopic behaviour of it's constituent atoms or molecules of the thermodynamical system.
By studying individual properties of atoms or molecules of the system we can explain macroscopic properties in statistical mechanics but not reverse.
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