Answer:
![\Delta P=61,952.8\ lb/ft^2](https://tex.z-dn.net/?f=%5CDelta%20P%3D61%2C952.8%5C%20lb%2Fft%5E2)
Explanation:
Given
Airline flying at 34,000 ft.
Cabin pressurized to an altitude 8,000 ft.
We know that at standard condition ,density of air
![\rho =0.074\ lb/ft^3](https://tex.z-dn.net/?f=%5Crho%20%3D0.074%5C%20lb%2Fft%5E3)
We know that pressure difference
ΔP=ρ g ΔZ
Here ΔZ=34,000-8,000 ft
ΔZ=26,000 ft
![g= 32.2\ ft/s^2](https://tex.z-dn.net/?f=g%3D%2032.2%5C%20ft%2Fs%5E2)
ΔP=0.074 x 32.2 x 26,000
![\Delta P=61,952.8\ lb/ft^2](https://tex.z-dn.net/?f=%5CDelta%20P%3D61%2C952.8%5C%20lb%2Fft%5E2)
So pressure difference will be
.
Answer:
Depth in the contracted section = 2.896m
Velocity in the contracted section = 2.072m/s
Explanation:
Please see that attachment for the solving.
Assumptions:
1. Negligible head losses
2. Horizontal channel bottom
<h3>What is a Critical Load?</h3>
Critical load Fcr or buckling load is the value of load that causes the phenomenon of change from stable to unstable equilibrium state.
With that beign said, first it is neessary to calculate the moment of inercia about the x-axis:
![Ix= \frac{db^3}{12}\\ Ix = \frac{2.(4)^3}{12} = 10.667in](https://tex.z-dn.net/?f=Ix%3D%20%5Cfrac%7Bdb%5E3%7D%7B12%7D%5C%5C%20Ix%20%3D%20%5Cfrac%7B2.%284%29%5E3%7D%7B12%7D%20%3D%2010.667in)
Then it is necessary to calculate the moment of inercia about the y-axis:
![Iy = \frac{db^3}{12}\\ Iy = \frac{4.(2)^3}{12} = 2.662in](https://tex.z-dn.net/?f=Iy%20%3D%20%5Cfrac%7Bdb%5E3%7D%7B12%7D%5C%5C%20Iy%20%3D%20%5Cfrac%7B4.%282%29%5E3%7D%7B12%7D%20%3D%202.662in)
Comparing both moments of inercia it is possible to assume that the minimun moment of inercia is the y-axis, so the minimun moment of inercia is 2662in.
And so, it is possible to calculate the critical load:
![Pc\gamma = \frac{2046\pi ^2E.I}{L^2} \\Pc\gamma= \frac{2046.\pi ^2.(1,6.10^3.10^3).2662}{(10.12)^2} \\Pc\gamma= 5983,9db](https://tex.z-dn.net/?f=Pc%5Cgamma%20%3D%20%5Cfrac%7B2046%5Cpi%20%5E2E.I%7D%7BL%5E2%7D%20%5C%5CPc%5Cgamma%3D%20%5Cfrac%7B2046.%5Cpi%20%5E2.%281%2C6.10%5E3.10%5E3%29.2662%7D%7B%2810.12%29%5E2%7D%20%5C%5CPc%5Cgamma%3D%205983%2C9db)
See more about critical load at: brainly.com/question/22020642
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