*72.  An airplane has an effective wing surface area of 16 m2 that is generating the lift force. In level flight the air speed over the top of the wings is 62.0 m/s, while the air speed beneath the wings is 54.0 m/s. What is the weight of the plane?

 

We assume the height difference between the top and bottom of the wind is negligible, so we can ignore any change in gravitational potential energy of the fluid.  Bernoulli’s principle then give us

 

 

For lift pressure on bottom will be greater than pressure on the bottom  we solve for

 

 

Lift force can be found from

 

 

Finally we assume lift goes into balancing weight since the flight is level.

 

 

 

 

 

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This page last updated on January 11, 2020