Question: It is possible to hear an approaching train before you can see it by listening to the sound wave through the track. If Young's modulus

It is possible to hear an approaching train before you can see it by listening to the sound wave through the track. If Young's modulus of the track steel is

2.0

10'

/

?

and the density of steel is

7800

/

',

how much faster is the speed of sound in the track than in air?

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