Why Does the Incline Angle Start Differently in Fluid Dynamics Problems?

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SUMMARY

The starting incline angle in fluid dynamics problems varies based on the defined coordinate system for each specific scenario. In some cases, the angle begins at the midpoint, while in others, it starts from one end. This variation is primarily due to the convenience of the coordinate system used, which can affect the interpretation and solution of the problem. Understanding the relationship between slope, linear acceleration, and gravitational force is crucial for accurate analysis.

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While working on fluid dynamics problems I noticed that the incline angle sometimes starts at middle while other times starts at one end. Is there an explanation for this?

I know the slope =(linear a)/(gravitational g)
 

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Read the problem statements.
 
It probably has to do with convenience of coordinate system definition for a given problem.
 

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