Answer:
Answer:B
Explanation:
Because it all stayed consistant
Answer:
upward lift on an aircraft wing decreases as it gains altitude.
Explanation:
- The lift on an airplane wing is generated due to the the difference in the pressure on the top of the wing and the bottom of the wing in accordance with the Bernoulli's Principle.
- The pressure on the lower part of the wing is higher due to the low velocity stream of air than on the upper part of the wing.
The governing equation of the Bernoulli's Principle is:
![\frac{P}{\rho.g} +\frac{v^2}{2g} +z=constant](https://tex.z-dn.net/?f=%5Cfrac%7BP%7D%7B%5Crho.g%7D%20%2B%5Cfrac%7Bv%5E2%7D%7B2g%7D%20%2Bz%3Dconstant)
where:
P = pressure of the fluid
g = acceleration due to gravity
density of fluid
v = velocity of the fluid
z = height of fluid from the datum
<u>But the lift force on the wings depends upon several aerodynamic factors given mathematically as:</u>
![L=cl. \rho.A.\frac{v^2}{2}](https://tex.z-dn.net/?f=L%3Dcl.%20%5Crho.A.%5Cfrac%7Bv%5E2%7D%7B2%7D)
where:
cl = experimental constant
density of air
A = area of wing
v = velocity of the air
As we move up in the atmosphere the density of air reduces and thus the force of lift will eventually decrease, that is the reason why airplanes have a flight ceiling, an altitude above which it cannot fly.
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Answer:
Clouds of gas and dust as well as new star formation are typically seen in Spiral galaxy
Explanation:
The ingredients for star formation are gas and dust, a spiral galaxy is a group of stars that are together as a consequence of the gravitational pull between them and, as the name said it, has a spiral shape.
They are composed for a central bulge, a disk (in which a spiral arms structure can be seen), gas and dust. Because of the presence of gas and dust, star formation is possible.