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Amanda [17]
2 years ago
14

A train whistle is 580 Hz when stationary. It is coming toward you at 18.8 m/s. What frequency do you hear?

Mathematics
2 answers:
Brums [2.3K]2 years ago
6 0

Answer:

612 hz

Step-by-step explanation:

580 + (580 / 343) * 18.8

=  612 Hz.

Usimov [2.4K]2 years ago
4 0

Answer:

612 Hz.

Step-by-step explanation:

The frequency of the sound  will be proportionally higher when coming towards you. The increase is related to the speed of the train.

So the frequency will be:  

580 + (580 / 343) * 18.8

=  612 Hz.

This is called the Doppler effect.

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9514 1404 393

Answer:

  ∠CAB = 28°

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Step-by-step explanation:

What you do in each case is make use of the relationships you know about angles in a triangle and around parallel lines. You can also use the relationships you know about diagonals in a rectangle, and the triangles they create.

<u>Left</u>

Take advantage of the fact that ∆AEB is isosceles, so the angles at A and B in that triangle are the same. If we call that angle measure x, then we have the sum of angles in that triangle is ...

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The measure of angle DAC is 64°.

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