9. In figure 4, determine the pressure head difference in feet of water between m and n, when z is (a)6.y in; (b)2y.x in; (c) 3y.x in 9.1 Determine the value of z when the pressure at m is 1y.x lb per sq in greater that at n 9.2 If z=1y.xy in, then the pressure at m is increased by 5.yx lb per sq in, while the pressure at n remains constant, determine the new value of z.

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Center of Gravity and Centroid

The term center of gravity indicates the position or location of a point about which the whole weight of a body or system is supposed to be concentrated, which means the whole weight of the body or system works through this point. It is closely related to mass distribution. For all positions of the body, the center of gravity would be a single point.