Physics
posted by Katie .
Find the length of a bridge if it is known that the steel in the roadbed expands by 0.52 m when the temperature changes from +2 to +30°C.

The liear expansion coefficient for steel in that temperature range is ab9out 12*10^6 per degree C change.
Solve this equation for L:
(delta L) = 0.52 m = L*(alpha)*(delta T)
where delta T = 30  2 = 28 C
L = 0.52 m/{28 * 12*10^6)