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- Thread starter AxiomOfChoice
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If you are traveling at constant velocity the angle of the liquid inside the cup will be zero. Think about when you fly on a plane at 350 mph, the liquid is still flat (unless the plane is slightly tilted).

If you start at zero velocity and begin to accelerate constantly, then the angle of the liquid in the cup will be

[tex]\theta = \tan^{-1} \left (\frac{a}{g}\right)[/tex]

where [tex]a[/tex] is your acceleration and [tex]g[/tex] is gravity.

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