Bernoulli's principle?

Question

Bernoulli's principle explains

a why airplanes fly.
b boats float.
c pistons work.
d ice melts.

NOTE: His princple is as te velocity of a fluid increases, the pressure exerted by the f uid decreases.

Answer 1

None of the above. The classic answer is that it explains why airplanes fly, but that is not correct. Airplanes fly because the pressure atop the wing is lower than the pressure on the bottom, but the reason has to do with the tilt of the wing with respect to the incident airstream, an effect that you can feel by sticking your hand out the window of a fast-moving car. The Bernoulli theory is that airplanes fly because, given the shape of the wing, the airstream above flows faster than the airstream below because the path length is longer, which reduces the side pressure. Why is this wrong?
- Helicopters fly, and their rotor cross-sections are symmetrical (for technical reasons), so the airstream path length above and below is the same.
- The Wright Flyer had a single surface wing, so the airstream path length above and below is the same.
- Have you ever seen an airplane fly upside down? (The endurance record for inverted flight is several hours; the flight ended because the pilot had to land to relieve himself.)

I ran the numbers on my Cessna; the Bernoulli effect contributes a few percent to the lift, but the rest derives from the wing angle.

Answer 2

a. why planes fly.

The Bernoulli principle is expressed by an equation (known as Bernoulli’s equation) which states that for a given volume of fluid, the total energy remains constant due to the principle of the conservation of energy. This means that when a fluid is in relative motion, the energy is split into the ‘parts’. The sum of these parts will not exceed a certain value which will remain constant as long as the external conditions do not change.


The Bernoulli principle has a big role in the operation of the aerodynamic surfaces such as wings of planes and Formua F1 cars.

Answer 3

The Bernoulli concept states that an appropriate fluid flowing in an enclosed device with out paintings being carried out ought to guard a relentless inner power. this is, the sum of the kinetic, ability, and tension energies must be the comparable in any respect factors interior the device. subsequently, if anybody form of power is greater effective, yet another must be the two decreased. subsequently, if the speed will enhance, then the stress ought to shrink. Or if the bypass have been downhill, the shortcoming of ability power ought to consequence interior the upward push interior the kinetic power. See the link under for a greater physically powerful talk of the Bernoulli concept, which includes the equation while paintings is carried out on or by ability of the fluid and the changes interior the equations while the fluid is compressible or incompressible.

Answer 4

A. Why airplanes fly.

It has to do with the way the wings are shaped.

Answer 5

a. why airplanes fly. this gives wings lift due to higher pressure from beneath.

Answer 6

principle is used to explain various differences in pressure changes on aircraft in flight as well as jet engine performance characterictics through different stages of the engine