An airplane ascends by 500 feet and then descends by 350 feet alternately for 1 hour each (i.e., 1 hour for ascending and 1 hour for descending). If the airplane was initially flying at the height of 1800 feet above sea level, find its height after 5 hours.
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Answers
Answer:
It would be reasonable to wager that the majority of air passengers have never questioned why the traditional flight altitude is 35,000 feet (10,600 metres).
The number has entered aviation lexicon as the catch-all height at which most aircraft travel from A to B. But do all planes fly this high – and if so why?
Why do planes fly so high?
The higher the better
One of the central reasons behind aircraft altitude is that, as the air gets thinner with every foot climbed, planes can travel more easily and therefore move faster and burn less fuel, saving money.
The "sweet spot" of flying is regarded as between 35,000 and 42,000 feet (the airline industry still uses feet and inches as its standard measurements) – too high and the oxygen becomes too sparse to fuel the engines, too low and the air resistance is greater. This optimum height is linked to the usual weight of a commercial jet – that is, heavier planes would fly lower, and lighter higher.
It would actually be most efficient to be forever climbing, rather than plateau when reaching say, 35,000 feet, cruising altitude, as the weight of the aircraft decreases due to fuel usage and the air thins.
"Each individual aircraft has an optimum altitude (for minimum cost or minimum fuel burn) which will be based on its individual weight," explains Peter Terry, a commercial airline pilot of 30 years.
"Concorde flew at much higher altitudes – 50,000/60,000 feet – where there were no other aircraft and so were able to cruise climb [that is keep climbing]."