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
In open channels, the specific energy is the

Total energy measured with respect to the datum passing through the bottom of the channel
Total energy per unit discharge
Kinetic energy plotted above the free surface of water
Total energy measured above the horizontal datum

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