21. The massive Three Gorges Dam on China's Yangtze River has height 185 m (Figure 16). Calculate the force on the dam, assuming that the dam is a trapezoid of base 2000 m and upper edge 3000 m, inclined at an angle of 55° to the horizontal (Figure 17). 3000 m 185 m 2000 m FIGURE 16 Three Gorges Dam on the Yangtze River. (Reuters/STR/Landov) FIGURE 17

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