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Ber [7]
3 years ago
8

The annoying sound from a mosquito is produced when it beats its wings at the average rate of 600. wingbeats per second. What is

the frequency of the sound waves?
1/600 Hz
1/300 Hz
300 Hz
600 Hz
Physics
1 answer:
jok3333 [9.3K]3 years ago
3 0
The frequency is exactly the rate at which the bug beats its wings.
If that "600" that you mentioned is 600 beats per second, then
THAT's the frequency . . . 600 per second. (600 Hz) 
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A train station bell gives off a fundamental tone of 500 Hz as the train approaches the station at a speed of 20 m/s. If the spe
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Answer: 529.9 Hz

Explanation:

Here we need to use the Doppler equation, so we have:

f' = f*(v + v0)/(v - vs)

Here, f is the frequency = 500Hz

v is the velocity of the wave, = 334m/s

v0 is the velocity of the observer = 20m/s

vs is the velocity of the source = 0m/s

Then we have:

f' = 500Hz*(334m/s + 20m/s)/(334m/s) = 529.9 Hz

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A 100 Kg man is diving off a 50 meter cliff. What is his kinetic energy when he is 20 meters from the water?
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Answer:

K.E=29.403125J

Explanation:

From the question we are told that

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Height 50-20=30m

Generally the equation for velocity before impact is is is mathematically given by

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v=\sqrt{2*9.8*30}

v=24.25

Generally the equation for Kinetic Energy is is mathematically given by

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K.E=\frac{1}{2}*100*(24.25)^2\\

K.E=29403.125J

K.E=29.403125J

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30- 20/5

= 10/5 = 2m/sec²

Force = mass * acceleration

Force = 0.1 * 2

Force = 0.2 Newton

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