Tuesday, June 22, 2010

Which ever one of you smart people can work this out for me will get ten points?

Given air of initial temperature of 15°C and pressure 994 hPa, and no moisture:


i. What would be its density?


ii. If its temperature was increased to 30°C, while the pressure stayed constant (the latter called an “isobaric process”) what would be its new density?


iii. If it now occupied (under the conditions in (ii)) a volume of 90×106 m3 (like the air in a small cloud), what would be its mass?


iv. Supposing that a mass of 1.14×103 tonne of water were evaporated into the mass in (iii), what would be the specific humidity of the moist air? Give your answer in units of g/kg.


v. What would be the density of the moist air in (iv), if the temperature decreased from 30°C back to 15°C during evaporation, but the pressure stayed at 994 hPa? Contrast your answer here with the dry air density at the same pressure and temperature.Which ever one of you smart people can work this out for me will get ten points?
I. 1.98 kg/m³





II. 2.01 kg/m³





III. 1.95 kg





IV. 526 g/kg





V. 2.21 kg/m³ for moist air, 2.11 kg/m³ for dry airWhich ever one of you smart people can work this out for me will get ten points?
I Pass
Maybe I am not that smart, but I am smart enough to know that you're asking us to do the homework for you. Do it yourself or quit school. There are burgers at McDonald's waiting for you to flip them...
Let's see, one of us gets 10 mostly useless points for putting real effort into finding answers to your question, and in return you get a good grade that could help you get into a college where you'll gain a degree by continuing to get other people to do your work for you. Then with your degree, you get a job based on the employer's belief you earned the degree by knowing the subject. Then we end up with yet another incompetent person in the workforce making mistakes the rest of us have to fix, putting much more burden on those of us who can do what our degrees say we can.





I'll not be a party to that!
25

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