If a cross-section has an area A cm 2 with the distance of the center of gravity Z to the axis line xx and measuring y and the axis of the axis yy size x the moment static to the axis xx and the axis xx is: Mx = Ay (cm 3), and a moment of static the axis yy is My = Ax (cm 3) .See picture!
Figure 4.12 Moment of static cross section of the x-axis and y
If the shape of the field consists of a variety of forms in combination then to determine the center of gravity Z can be done by counting the number of moments of static from the field field to axis xx and axis yy which is further divided by the amount of bandwidth it will get the distance line weight, either line distance weight on the x-axis and the y-axis. And the intersection of the lines y measuring the weight and size of the line xx x to the axis yy is heavy point Z is sought. To calculate the distance X and Y can be calculated by persamanan:
Description :
Figure 4.13 The distance-distance cross-section of the x-axis and y