By adjusting the length of the bridge will be three sizes 15 25 and 35 meters, the length of the bridge cut to size will also change accordingly. Bridge and the bridge, but it is the natural frequency of the different .
The bridge length is 3 m, size 25 and 35 is 15, which is the length of the bridge cut the page size is changed, it will change and will make the bridge, but the bridge will give you a different natural frequency .
The Bridge will be adjust the length is 3, 15, 25, and 35 meters, the length of the change in size of the bridge, it will be cut off the change. And I will make a bridge, but the bridge will have a different natural frequency