Hydraulics and Fluid Mechanics in ME
An open tank containing liquid is made to move from rest with a uniform acceleration. The angle 0 which the free surface of liquid makes with the horizontal is such that (where a = Horizontal acceleration of the tank, and g = Acceleration due to gravity)

tanθ = a/g
tanθ = 2 a/g
tanθ = a2/2g
tanθ = a/2g

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Hydraulics and Fluid Mechanics in ME
If the elevation of hydraulic grade line at the junction of three pipes is above the elevation of reservoirs B and C and below reservoir A, then the direction of flow will be

from reservoir B to reservoirs C and A
unpredictable
from reservoir C to reservoirs A and B
from reservoir A to reservoirs B and C

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