Calculating Drag using Momentum Equation

In summary, the conversation is about a difficult equation that the person is stuck on and needs help with for an upcoming exam. There is also a discussion about the poor quality of the figures provided.
  • #1
BSids
8
0

Homework Statement


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Homework Equations


See above photo.

The Attempt at a Solution


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Hey guys, I'm stuck on this equation never done anything like it but apparently its due to come up on exam next week. Any ideas on where to go with it so far...i stopped as i was about to remove the integral for U1 as it is constant.
As concerns the second part, I'm I right in presuming i work out the thickness, fill that into the given u equation and then in turn use the derived equation to solve

Hope ye can help, thanks.
 
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  • #2
The reason you're not getting any responses is because of the poor quality of the figures you have provided. No one is going to take the time to try to read them, especially the ones that are rotated 90 degrees.

Chet
 

FAQ: Calculating Drag using Momentum Equation

What is the momentum equation?

The momentum equation is a fundamental principle in mechanics that states that the change in momentum of a system is equal to the net external force acting on the system.

How is drag calculated using the momentum equation?

Drag can be calculated using the momentum equation by first determining the initial and final momentum of the system, and then subtracting the two values to find the change in momentum. This change in momentum can then be equated to the net external force, which includes the force of drag, and solved for the drag force.

What factors affect the calculation of drag using the momentum equation?

The calculation of drag using the momentum equation is affected by several factors, including the velocity of the object, the density of the fluid it is moving through, the cross-sectional area of the object, and the drag coefficient, which is a measure of the object's shape and surface characteristics.

Can the momentum equation be used for all types of drag?

The momentum equation can be used for most types of drag, including pressure drag, skin friction drag, and wave drag. However, it may not be applicable to certain types of drag, such as induced drag, which is caused by the production of lift.

Are there any limitations to using the momentum equation for calculating drag?

The momentum equation has limitations in its application for calculating drag, as it assumes that the fluid is incompressible and the flow is steady and non-turbulent. It also does not take into account factors such as surface roughness and flow separation, which can significantly affect the drag force.

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