Physics: Plane Mass, Wing Area & Lift Force

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Homework Help Overview

The discussion revolves around calculating the pressure on the upper wing surface and the lift force acting on an airplane during level flight, given its mass and wing area. The problem involves concepts from fluid dynamics and aerodynamics.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants are attempting to determine the pressure on the upper wing surface and the lift force, with some expressing confusion about their calculations and the implications of the results.

Discussion Status

Some participants have provided numerical estimates for the pressure calculations but express uncertainty about their reasoning. There is a question regarding the sufficiency of the lift force for maintaining flight, indicating a mix of interpretations and levels of understanding.

Contextual Notes

Participants are grappling with the implications of their calculations and the assumptions related to the conditions of flight, including the relationship between pressure and lift. There is a noted ambiguity in the phrasing of the problem regarding the sufficiency of lift.

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An airplane has a mass of 1.60 x 10^4 kg and each wing has an area of 40.0 m^2. During level flight, the pressure on the lower wing surface is 7.00 x 10^4 Pa.
a) Determine the pressure on the upper wing surface.
b) Determine the lift force on the plane. Is it sufficient to lift the plane?:confused:
 
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What sort of work have you done so far?
 
Answer

Well.. i get 68.0kPa
but my reasoning doesn't make sense.. i got confused and lost:confused:
 
The force on the bottom of the wing is equal to the plane's weight plus the force due to the pressure above the wing. Plugging in the numbers, i got 66 kPa.
The second part makes no sense to me. "Is it sufficient to lift the plane?" Well its flying, isn't it? ...
 

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