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A bridge is made of concrete (cement) and it has a length of Lo. If the temperature changes from -5 C to 49 C

A bridge is made of concrete (cement) and it has a length of Lo. If the temperature changes from -5 C to 49 C 

A bridge is made of concrete (cement) and it has a length of Lo. If the temperature changes from -5 C to 49 C and as a result of this the change in length is 21 cm. Find the initial length of the bridge. . Linear Expansivity of Concrete = 14.5 10-6 m/(m.K)

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