The maximum power output capability of an engine decreases with altitude because

Question

The maximum power output capability of an engine decreases with altitude because the air density and hence the mass flow rate of air decreases. A truck leaves Denver (elevation 1620 m) on a day when the local temperature and absolute pressure are 15 ?C and 94 kP a, respectively. It travels through Vail Pass (elevation 3260 m), where the temperature is also 15?C. Assuming that the temperature is constant with altitude, determine the absolute pressure and density at Vail Pass. Assuming that the maximum power output is proportional to density, how much less maximum power (in percent) does the truck have compared to Denver?

Explanation / Answer

http://www.slideshare.net/rayuth/thermodynamics-an-engineering-approach-5th-edition-gengel-boles111111-9475562 https://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&ved=0CDMQFjAA&url=http%3A%2F%2Faskthephysicist.com%2Fask_phys_q%2526a_old4.html&ei=IQ8QUYXUEcmOrgeo4IHoDw&usg=AFQjCNGEGgc6R-xLlqtHChOz84Ga4oJSFg&sig2=0Qiav0OQjI65XeOAp9FQKg&bvm=bv.41867550,d.bmk

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