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Mandarinka [93]
3 years ago
11

A plane flies at 200 m/s, emitting a 600 Hz roar. Assuming a 340 m/s speed of sound, what will be the frequency of sound waves h

eard by a stationary observer directly behind the plane? I NEED THIS ASAP PLEASE
A. 247 Hz

B. 260 Hz

C. 378 Hz

D. 400 Hz
Physics
1 answer:
stepladder [879]3 years ago
7 0

Answer:

378 Hz

Explanation:

When source of sound moves away from stationary listener

f' = f x V / ( V + Vs)

f' = 600 x 340 / ( 340 + 200)

f' = 204000/540

f' = 378 Hz

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A bus took 8 hours to travel 639 km. For the first 5 hours, it
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Answer:

93 km/h

Explanation:

Given that a bus took 8 hours to travel 639 km. For the first 5 hours, it travelled at an average speed of 72 km/h

Let the first 5 hours journey distance = F

From the formula of speed,

Speed = distance/time

Substitute speed and time

72 = F/5

F = 72 × 5 = 360 km

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Speed = 279/3

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8 0
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Answer:

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B. La densidad.

Explanation:

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