Hydraulics and Fluid Mechanics in ME
The discharge through a channel of trapezoidal section is maximum when

The sloping side is equal to half the width at the top
Width of channel at the top is equal to twice the width at the bottom
The sloping side is equal to the width at the bottom
Depth of channel is equal to the width at the bottom

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Hydraulics and Fluid Mechanics in ME
Buoyant force is

The force necessary to maintain equilibrium of a submerged body
The resultant force acting on a floating body
The resultant force on a body due to the fluid surrounding it
Equal to the volume of liquid displaced

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