The main span of Jiangyin Yangtze River Bridge is 1385m, the navigation height under the bridge is 50m, and the towers on both sides are 196m. There is a main cable on the east and west sides of the Y

The main span of Jiangyin Yangtze River Bridge is 1385m, the navigation height under the bridge is 50m, and the towers on both sides are 196m. There is a main cable on the east and west sides of the Yangtze River Bridge. Assuming that the angle between the main cable and the vertical direction is θ, the geometric relationship shows that:

tanθ=692.5 196？ 50=4.7? Then: cos θ =112+4.72 =14.8.

t？ 2cosθ=G

T= 1.2× 108N。

So choose: C.