By adjusting the length of the bridge will be three sizes 15 25 and 35 meters in length that changes. The section of the bridge was changed to the natural frequency of the bridge was changed to a .
The bridge length is 3 meters in size, is 15 to 25 and 35 which length change. Make the section of the bridge, it will change to that of the natural frequency of bridge will change. .
The Bridge will be adjust the length is 3, 15, 25, and 35 meters long, the change to section of the bridge, it will change to the natural frequency of the bridge, it will change to a