help me for fluids mechanic?

You bought a box of orange juice, let’s say 0.5 L, and you want to serve it into cups. But you noticed

that, if you increase the angle of the box from the near-horizontal position, i.e., 30°, through near-vertical

position, i.e., 75°, the juice starts to splash out from the bottle and you can no longer obtain a smooth

discharge. Explain the physics of this phenomenon by using the fundamentals of Fluid Mechanics.

• show your detailed schematics,

• indicate the related balance equations,

• explain the physics behind this phenomenon in your words. 

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