Certain airplanes fly at low altitudes while jets fly at higher altitudes. Why?
As others have noted, jets CAN fly high whereas piston aircraft frequently can’t. This is because their engines can’t get them up there (especially true of non-turbocharged piston engines).So why aren’t all planes jets? For one, jets are expensive. They burn lots of gas no matter what they’re doing. It doesn’t make sense to do primary flight training in a jet since that would be a waste of money.Jets are also inefficient at low altitudes, so if you want to fly low you’re better off with a piston.Flying higher is more aerodynamically efficient and more safe since it gives you time to resolve emergencies, so why would you want to fly low?You might be in the military and looking to avoid a radar signature by buzzing terrain. You might be surveying pipes, towing banners, dropping skydivers, looking for stranded hikers in the wilderness, touring the grand canyon or doing any number of things that are better done down low where you can see (or be seen from) the ground clearly.As it usually is when planes look very different from one another - the reason is that they were built for different missions.
Do airplanes fly faster at higher altitudes?
Yes, and no. Aircraft normally fly at an optimal indicated airspeed until they reach their optimal climb/cruise Mach. This transition from airspeed to Mach normally occurs in a transition zone of around 27000 - 30000 ft. An aircraft's true airspeed relative to the speed of sound is expressed as a decimal such as Mach .82. (The scientific leading zero is normally dropped). Due to wing design, non-supersonic aircraft are limited to Mach speeds of less than M.90 and most rarely exceed M.80As altitude increases, air temperature decreases. The speed of sound in air varies directly with temperature, so as temperature decreases, so does the true airspeed associated with a given Mach.As aircraft climb to the transition zone at a constant indicated airspeed (the speed shown on their instruments), their true airspeed (actual speed through the air) increases. This is because as air gets thinner it has less impact on the sensors that drive the airspeed indicators, so for a given indicated airspeed, true airspeed increases with altitude. So, Yes.Since wing efficiency is limited by Mach, once aircraft reach the transition altitude, Mach remains essentially constant through the rest of the climb and cruise. For altitudes that most aircraft fly the temperature of the air (and the speed of sound) decreases with increasing altitude so, at a given Mach, true airspeed is lower at higher altitudes. So, No.Because of this, the maximum true airspeed at which an aircraft can fly occurs in the transition zone, but overall efficiency is achieved at higher altitudes due to less drag, even though the true airspeed is less.If a flight is behind schedule and has lots of connections, one of the options to make up time is for the flight to be flown at a lower than normal altitude, but above that transition zone.Bottom line, Yes, up to the transition zone, aircraft fly faster as altitude increases, then, No, they fly slower as altitude increases.
Low and high altitudes multiple choice question..help plz!! 10 points!!!?
Theres only one right answer! 10 points for the right one!! THANks Some things take longer to cook at high altitudes than at low altitudes because __________. -water boils at a higher temperature at high altitude than at low altitude -there is a higher moisture content in the air at high altitude -natural gas flames don't burn as hot at high altitudes -water boils at a lower temperature at high altitude than at low altitude -heat isn't conducted as well in low density air
Why do planes fly at a high altitude?
Jet engines use significantly less fuel at higher altitudes. The air is less dense up there so the engine will burn less fuel. (Not as much air going through the engine so you don't need as much fuel--also less dense air means less drag). Fuel burn at low altitudes and high power settings on jet engines, even the new generation of fuel efficient engines, is mind boggling. Airline crews begin the climb to get to the most optimum altitude for their weight as soon as ATC will let them.
Why does it take longer to cook food at higher altitudes?
You got the idea but still didn't hit the spot. As elevation increases atmospheric pressure decreases. This means vapor pressure on water decreases as elevation increases. This results to easier escape of water molecules because the vapor pressure pushing them down is decreased. That is why when you heat water at high elevation, the water reaches boiling point at much lower temperature: water boils at 100C at sea level but boils less than 100C at elevated level. So when you cook meat or egg in water on top of a mountain, your water has already evaporated leaving your meat or egg partially cook or worse still raw. This makes cooking with water very hard! It is advisable you use brine for cooking. Or you bring along a pressure cooker! Water EASILY boils on a mountain. =) Water boils at a SHORTER time on a mountain. =) Dipping your hand in a boiling water on a mountain will NOT HURT you. =) LESS ENERGY is required to boil water on a mountain. =) Don't get confused ok. So there you go!
Why do airplanes fly at such high altitudes?
Airplanes use less fuel at high altitude than they use at low altitude, because the air is thinner at high altitudes and therefore produces less air resistance to slow the airplane down. In addition, flying high keeps an airplane above most of the weather and turbulence. The distance is essentially the same whether the flight is at a high altitude or a low altitude. The most fuel-efficient flight is at low speed and maximum altitude. However, for practical reasons, airliners typically fly closer to their maximum speed than to their minimum speed, and they don't quite fly at their maximum altitudes.
My car consumption increases when I am in a higher altitude than in a lower one. What are the known scientific reasons to explain this?
1 .At higher altitude since O2 concentration is a little lesser than the lower altitudes, and as an internal combustion engine needs a good amount of O2 to perform complete combustion. If there is incomplete combustion due to lack of O2 then this will indirectly impact the fuel efficiency by distorting engine input output ratio. 2.May be due to presence of rough terrain at higher altitudes causes engine to put extra efforts to manage it.