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 Mar 14th 2011, 03:26 AM #1 Junior Member   Join Date: Mar 2011 Posts: 3 please help determine the pressure Mount Kilimanjaro is the highest peak on the African continent and rises to a height of approximately 5900m above sea level.Take the gas constant to be 287 J/kg K and the temperature lapse rate to be 0.0065 K/m. It is known that altitude sickness can occur to human beings when the absolute pressure of the atmosphere drops below 75 kPa.Determine if normal human beings can scale half of the mountain without feeling uncomfortable if the pressure and temperature at ground level is 101 kPa and 25°C
 Mar 14th 2011, 06:23 AM #2 Physics Team     Join Date: Jun 2010 Location: Mauritius Posts: 609 At sea level, P = 101 kPa, T = (25+273) = 298 K At half the height of Kilimanjaro, you have the height = 5900/2 = 2950 m = 2.95 km. Find the temperature at this altitude. Then, with the other information given, I don't think that the gas constant will be of any use, unless there is something more. Just use the ideal gas equation. PV = nRT Initial conditions, P1, V1, T1, n1, R. Assuming density of air is constant, n1 and V1 is constant. Giving: P1/T1 = k (where k is the constant nR/V) And at half the mountain up, P2/T2 = k Hence, we get P1/T1 = P2/T2 or P1T2 = P2T1 __________________ Jerry (Got my results!) It is easier to protect your feet with slippers than to cover the earth with carpet. No one can go back and change a bad beginning; but anyone can start now and create a successful ending. If a problem can be solved, no need to worry about it. If it cannot be solved what is the use of worrying?

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