Question

Why are the bridges declared unsafe? after a long use?​

Answer 1

$\underline{\underline{\Huge\mathfrak{Answer-: }}}$

A bridge during its use undergoes alternating stresses and strains for a large number of times each day, depending upon the movement of vehicles on it. When a bridge is used for long time, it loses its elastic strength. Therefore, the amount of strain in the bridge for a given stress will become large and ultimately, the bridge may collapse. That is why the bridges are declared unsafe after long

Answer 2

Answer:

Explanation:

Bridge I's unsafe after long use

✔✔Because it started to loose its strength there so there is chances of collapsing the bridge

✔✔If the frequency match when any natural disaster occur and its frequency and bridge frequency match than it may collapse

✔✔To avoid that accidental .

Hope it helps you