Hydraulics and Fluid Mechanics in ME
The torque required to overcome viscous resistance of a collar bearing is (where R1 and R2 = External and internal radius of collar)

μπ²N/60t) × (R₁³ - R₂³)
(μπ²N/60t) × (R₁ - R₂)
(μπ²N/60t) × (R₁² - R₂²)
(μπ²N/60t) × (R₁⁴ - R₂⁴)

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Hydraulics and Fluid Mechanics in ME
In open channels, the specific energy is the

Total energy measured above the horizontal datum
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

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

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

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