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Liquid pressure and thrust. Centres of pressure 273
Using vertical ordinates
Referring to Figure 30.6.
Thrust on the element
wEgE y2 EyEdx wEgEy2
Fig. 30.5
2 Edx wEgEy2 2
Moment of the thrust about OX 2 EdxE 3 y wEgEy3
Moment of total thrust about OX 3 EgE y3Edx
Total Thrust wEgEAEDepth at centre of gravity
1 y2Edx wEgE yEdxE 2 yEdx
w 2EgE y2Edx
3 Edx w
