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SCORPION-xisa [38]
3 years ago
10

A substance burns in the presence of oxygen.

Physics
2 answers:
valina [46]3 years ago
5 0
If I don’t know a answer I put C bc it is a 50/50 chance but it might be wrong
makkiz [27]3 years ago
5 0

Answer:

D. flammability

Explanation:

I took the test and got it right

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Elephants can communicate over distances as far as 6 km by using very low-frequency sound waves. What is the wavelength of a 10
harkovskaia [24]

The characteristics of the sound waves allow to find the result for the wavelength is:

         λ = 34.29 m

The sound wave is a longitudinal traveling wave, where the speed of the wave depends on the air temperature.

         v = v_o \sqrt{1 + \frac{T}{273} }  

where v₀ is the speed of sound for T = 0ºc v₀ = 331 m / s.

indicate that the temperature is T = 20ºC, let's find the speed of the traveling wave.

        v = 331 \sqrt{1 + \frac{20}{273} }  

        v = 342.9 m / s

The speed of sound is related to wavelength and frequency.

       v = λ f

        λ = \frac{v}{f}

Let's calculate

        \lambda = \frac{342.29}{10}  

        λ  = 34.29 m

In conclusion using the characteristics of sound waves we can find the result for the wavelength is:

          λ = 34.29 m

Learn more here:  brainly.com/question/21995826

3 0
2 years ago
What is the atomic number of an atom?
Sever21 [200]

Answer:

B, the number of protons.

Explanation:

It is the number of protons found in the nucleus of the atom.

4 0
2 years ago
What is deceleration?????<br><br>Have a nice day​
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Deceleration—the ability to slow down and control force production—is often ignored during training; but deceleration technique is critical for most sports. Speed is often the factor that separates the elite from the average athlete. Credit source is stack.com have a nice day! I told you it was from the internet in case you couldn’t use the internet Hope this helped :)!
3 0
2 years ago
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If 20 beats are produced within a single second, which of the following frequencies could possibly be held by two sound waves tr
zhuklara [117]

The correct choice is

D. 22 Hz and 42 Hz.

In fact, the beat frequency is given by the difference between the frequencies of the two waves:

f_B = |f_1 -f_2|

In this problem, the beat frequency is f_B=20 Hz, therefore the only pair of frequencies that gives a difference equal to 20 Hz is

D. 22 Hz and 42 Hz.

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3 years ago
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False, wood is a solid structure that is not see through
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