An airplane flies with a constant speed of 780 miles per hour. How far can it travel in 4 hours?
2 answers:
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Answer:
The minimum riding speed relative to the whistle (stationary) to be able to hear the sound at 21.0 kHz frequency is 15.7 m/s
Explanation:
The Doppler shift equation is given as follows;
Where:
f' = Required observed frequency = 20.0 kHz
f = Real frequency = 21.0 kHz
v = Sound wave velocity = 330 m/s
= Observer velocity = X m/s
= Source velocity = 0 m/s (Assuming the source is stationary)
Which gives;
330 - = (20/21)*330
= 330 - (20/21)*330 = 15.7 m/s
The minimum riding speed relative to the whistle (stationary) to be able to hear the sound at 21.0 kHz frequency = 15.7 m/s.
Answer:
True.
Explanation:
- Applying the definition of average velocity, we know that we can always write the following expression:
(1)
- By definition, Δx is just the displacement, and Δt is the time interval.
- So, just rearranging terms in (1), we get: