Problem 14.54 A train on one track moves in the same direction as a second train

Question

Problem 14.54

A train on one track moves in the same direction as a second train on the adjacent track. The first train, which is ahead of the second train and moves with a speed of 36.4m/s , blows a horn whose frequency is 124Hz .

Part A

If the frequency heard on the second train is 132Hz , what is its speed?

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Problem 14.54

A train on one track moves in the same direction as a second train on the adjacent track. The first train, which is ahead of the second train and moves with a speed of 36.4m/s , blows a horn whose frequency is 124Hz .

Part A

If the frequency heard on the second train is 132Hz , what is its speed?

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Explanation / Answer

Apply f' = f(v + vo)/(v + vs)

132 = 124(343 + vo)/(343 + 36.4)

vo = 60.9 m/s

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