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meriva
2 years ago
8

Hello everyone, how are you? But well, can you follow me? please​

SAT
2 answers:
worty [1.4K]2 years ago
8 0

Answer:

Sure, I will.

Explanation: I just will because you asked.

Alenkasestr [34]2 years ago
7 0

Answer:

<h3>Hi!!!</h3>

Explanation:

<h2>Yes I did....thx for following me back...</h2>

Brainliest pls!

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The three countries which have over 86% of the population are
Afina-wow [57]

Answer:

d. Latin America, Asia, and Africa

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3 years ago
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A bat emits a sound at a frequency of 3. 00 × 104 hz as it approaches a wall. The bat detects beats such that the frequency of t
OLga [1]

Taking into account the Doppler efect, the speed of the bat is closest to 5.02 \frac{m}{s}.

The Doppler effect is defined as the apparent frequency change of a wave produced by the relative movement of the source with respect to its observer. In other words, this effect is the change in the perceived frequency of any wave motion when the sender and receiver, or observer, move relative to each other.

The following expression is considered the general case of the Doppler effect:

f1=f\frac{v+-vR}{v+-vE}

Where:

  1. f1, f: Frequency perceived by the receiver and frequency emitted by the issuer respectively. Its unit of measurement in the International System (S.I.) is the hertz (Hz), which is the inverse unit of the second (1 Hz = 1 s⁻¹)
  2. v: Velocity of propagation of the wave in the medium. It is constant and depends on the characteristics of the medium. In this case, the speed of sound in air is considered to be 340 m/s
  3. vR, vE: Speed ​​of the receiver and the sender respectively. Its unit of measure in the S.I. is the m/s
  4. ±, ∓:
  • We will use the + sign:

In the numerator if the receiver approaches the sender

In the denominator if the sender moves away from the receiver

  • We will use the sign -:

In the numerator if the receiver moves away from the emitter

In the denominator if the sender approaches the receiver

In this case, a bat emits a sound at a frequency of 3.00×10⁴ Hz= 30,000 Hz as it approaches a wall.

The bat detects beats such that the frequency of the echo is 900 hz higher than the frequency the bat is emitting.

So, you know:

  • f1= 30,000 Hz + 900 Hz= 30,900 Hz
  • f= 30,000 Hz
  • v= 340 m/s
  • vE=vR= vbat
  • Receiver approaches the sender

Replacing in the expression is considered the general case of the Doppler effect:

30900 Hz=30000 Hz\frac{340 \frac{m}{s} +vbat}{340\frac{m}{s} -vbat}

Solving:

\frac{30900 Hz}{30000 Hz} =\frac{340 \frac{m}{s} +vbat}{340\frac{m}{s} -vbat}

1.03=\frac{340 \frac{m}{s} +vbat}{340\frac{m}{s} -vbat}

1.03×( 340\frac{m}{s} -vbat)= 340 \frac{m}{s} + vbat

1.03×340\frac{m}{s} - 1.03×vbat= 340 \frac{m}{s} + vbat

350.2\frac{m}{s} - 1.03×vbat= 340 \frac{m}{s} + vbat

350.2\frac{m}{s} - 340 \frac{m}{s}= vbat + 1.03×vbat

10.2 \frac{m}{s}= 2.03×vbat

10.2 \frac{m}{s}÷ 2.03 = vbat

<u><em>5.02 </em></u>\frac{m}{s}<u><em>= vbat</em></u>

In summary, the speed of the bat is closest to 5.02 \frac{m}{s}.

Learn more about the Doppler effect:

  • brainly.com/question/17107808
  • brainly.com/question/14929897
6 0
2 years ago
What is the difference between GPA and cumulative GPA?
ioda

Answer:

The difference is that the cumulative GPA covers shorter periods, like a term or a semester. The overall GPA refers to the average grades obtained by a student throughout his entire academic experience. This means the overall GPA includes grades from all terms and semesters.

(Copied from google)

hope that helps

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Which of the standard deviations will have the narrowest curve?
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Normal distribution curve has the greatest standard deviation.
Standard deviation describes how far from the mean the given data set spread out
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This excerpt most clearly conveys Lady Bracknell’s belief that makes someone more desirable.
Ugo [173]

This excerpt most clearly conveys Lady Bracknell’s belief that wealth makes someone more desirable.

  • From the story "The importance of being Earnest",. a conversation bean between Mr. Worthing and Lady Bracknell's about Miss Cardew as to if she had little fortune or not.

  • When the response came that Miss Cardew had about hundred and thirty thousand pounds in the funds and not not as little as she had taught. This alone spike the interest of Lady Bracknell as she later regard Miss Cardew as the most attractive young lady.

Conclusively we cay say that this excerpt most clearly conveys Lady Bracknell’s belief that wealth makes someone more desirable.

Learn more from

brainly.com/question/12087145

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