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3 years ago

Why empty tin-cans ocillating for a longer time

1 answer:

3 0

Answer: When you speak into the can, your voice creates air vibrations that travel into the can, vibrate the bottom of the can, which in turn vibrates the string all the way over to the other can, in turn vibrating the other can's bottom, then the air again.

Explanation:

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A 2.15-MHz sound wave travels through a pregnant woman’s abdomen and is reflected from the fetal heart wall of her unborn baby.

MrRa [10]

Answer:

v= 0.0316 m/s

Explanation:

We need to use the Doppler Effect defined as the change in frequency of a wave in relation to an observer who is moving relative to the wave source.

Notation

Let v= magnitude of the heart wall speed

V= speed of sound

fh= the frequency the heart receives (and reflects)

fi= original frequency

ff= reflected frequency

fb= frequency for the beats

Apply the Doppler Effect formula

Since the heart is moving observer then the device is a stationary source, and we have this formula

fh = [(V+ v)/(v)] fi (1)

We can consider the heart as moving source and the device as a stationary observer, and we have this formula

ff = [(V)/(V-v)] fh (2)

The frequency for the beats would be the difference from the original and the reflected frequency

fb = ff -fi (3)

Replacing equations (1) and (2) into equation (3) we have:

$f_b = \frac{V}{V-v} \frac{V+v}{V}f_i - f_i$

$f_b = f_i ( \frac{V+v}{V-v} -1)$

fb = fi(V+v -V+v)/(V-v)

$f_b = \frac{2v}{V-v}$

Solving for v we have:

$v = V (\frac{f_b}{2f_o - f_b})$

$v = 1510 m/s (\frac{90 Hz}{2∗2150000Hz - 90 Hz})= 0.0316 m/s$

5 0

3 years ago

Can someone please help me get this right pleaseee I’ll mark brainless .

Katarina [22]

Answer:i think it is c

Explanation:

4 0

3 years ago

Read 2 more answers

What is the answer to this problem 2.40e+3kg

8090 [49]

3/5•(4e+5kg)

:

Factor out 3/5 from the expression

3/5•(4e+5k)

Use the commutative property to reorder the terms

3/5(4e+5k)

6 0

3 years ago

Gold, which has a density of 19.32 g/cm3 , is the most ductile metal and can be pressed into a thin leaf or drawn out into a lon

shepuryov [24]

Answer:2 ius the density because the thickness is that

Explanation: Because I said so.......Hope this helped

8 0

3 years ago

Using the following equation, find in seconds 145m = 9 m/s x t-35m

Zina [86]

Answer:

t = 20 s

Explanation:

145 m = 9 m/s × t – 35m

We can obtain the value of t in seconds by doing the following:

145 m = 9 m/s × t – 35m

Add 35 m to both side as shown below:

145 m + 35 m = 9 m/s × t – 35m + 35 m

180 m = 9 m/s × t

Divide both side by 9 m/s

t = 180 m / 9 m/s

t = 20 s

Therefore, the value of t is 20 seconds.

5 0

3 years ago

Why empty tin-cans ocillating for a longer time​

Why empty tin-cans ocillating for a longer time