Abridge is made with segments of concrete 91 m long (at the original temperature). if the linear expansion coefficient for concrete is 1.2 × 10−5(◦c)−1, how much spacing is needed to allow for expansion for an increase in temperature of 56◦f? answer in units of cm.

Explanation:

It is given that,

Length of bridge, L = 91 m

The linear expansion coefficient for concrete is,

Change in temperature,

Let is the increase in length. The formula is given by :

or

So, the expansion in the bridge is 1.45 cm. Hence, this is the required solution.      

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snell's law

refractve index = sin incidence / sin refraction