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Physics Mass of weight to keep gate closed


New member
Oct 17, 2018
Hi All,

Cannot seem to figure out the question below. I`ve attached an image of the question.

I basically need to find the mass of the weight W.

The hinged gate will open when the water height is 12ft.

The gate is a 5ft wide L shaped gate, hinged at point A.

I`ve gone down the line of CW = CCW moments but cannot seem to answer this.

Any help greatly appreciated. I really want to understand the entire process behind the calculation so I can work through these problems myself going forward :)

This is first year fluid dynamics.