The 4-m diameter circular gate shown in the figure is located in the inclined wall of a large reservoir containing water (y = 9800 N/m gate is mounted on a shaft along its horizontal diameter. For a water depth of 10 m above the shaft determine the external momer would have to be applied about the shaft to just open the gate. The weight of the gate can be neglected. 60

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Properties of Fluids

The term fluid represents a type of substance that can easily change its shape under any external pressure/force and can flow. Fluids can acquire any shape in which it is stored and can resist normal stresses but cannot resist shear stress in rest condition. Whenever external shear stress is applied to fluids, it starts to flow. The fluids may be liquid or gas. Example- water, air, etc.