ray2_moot's answer will work. Normally, since both the universal gravity constant and the mass of the Earth are constant, the two are multiliplied together to obtain a new constant called the geocentric gravitational constant. It's 3.986004418 x 10^14 m^3/sec^2.
(abhishek j gave your the formula for the FORCE of gravity as you move further away from the Earth. However, if you know that F=ma, then you can obtain the acceleration by dividing out the mass
that is why an air planes still fly with an engine on fire
all this formula means is that an air plane is a glider and will still fly with out an engine for a short time.
2006-12-23 07:46:59
·
answer #1
·
answered by daniel_weedman 2
·
0⤊
0⤋
Do you mean "Hey, I want to know an airplane flies because of the fire coming from the engine or the air from the engine?" It makes it a whole lot easier to answer a question when it is in understandable format.
For a jet engine, the pressure and heat from the combustion are forced out the rear of the engine by its design. This produces an area of low pressure inside the engine which suck fresh air in from the front, creating a new low pressure area which pull the plane into it, reinforced by the push of the exhaust trying to leave the engine. A prop engine creates the low pressure by the shape and direction of rotation of the propeller blades. Once forward motion is obtained it creates the low pressure on the wings which results in lift and flight.
2006-12-23 15:19:08
·
answer #2
·
answered by St N 7
·
0⤊
0⤋
An airplane flies because of the lift caused by the shape of its wings. Because the air that flows on top of its wing travels farther than the air on the bottom due to the wing's shape, the air pressure on the bottom is greater than the pressure on top which pushes (or pulls depending on your point of view) the wing up and therefore the plane.
The engine thrust (i.e. the force of the air being pushed out) results in the plane moving in a forward direction (Newton's law: every action has an equal and opposite reaction). This forward movement is what causes the air to flow around the wing and therefore creates lift.
Don't forget, even with perfect aerodynamics, a plane can only fly as well as its pilot! :)
2006-12-23 15:20:56
·
answer #3
·
answered by Anonymous
·
0⤊
0⤋
ok nice question the air plain flying because the presure in the plain is not same the air presure outside the air plain tis defrent of the presure made by the engine
2006-12-23 18:26:44
·
answer #4
·
answered by badr a 1
·
0⤊
0⤋
they flap their wings hard to keep ahead of the fire
2006-12-23 16:50:54
·
answer #5
·
answered by bungee 6
·
0⤊
0⤋
It fly because of it fire. It fire, from hole. Burn hims hamby, fire.
2006-12-23 15:17:55
·
answer #6
·
answered by Anonymous
·
0⤊
0⤋