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Bess [88]
2 years ago
10

Three Students: Samantha, Colton and Elizabeth are standing the same distance from an explosion. Samantha wears a blindfold and

hears the explosion only. Fulton wears headphones so will only know when the explosion happens based on sound. Elizabeth will be blindfolded and wearing headphones. She will feel the explosion through the ground. Predict what order the studetns will know that the explosion happened. Explain below. *
Chemistry
1 answer:
marin [14]2 years ago
7 0

The cinematic allows finding that Elizabeth is the first to hear the sound, Samantha is the second person to hear the explosion and Fulton the last, since he has the time in the air plus the transformation time of the sound in the headphones.

When an object explodes, a sound wave of great intensity is produced, this wave propagates through the different media with which it is in contact.

The speed of sound in each medium is given by the expressions

          v = \sqrt{\frac{B}{\rho } }

Where B is the volumetric modulus, ρ the density of the medium.

Sound is a wave so its velocity is constant, so we can use the kinematic relationships for uniform motion

            v = \frac{d}{t}  \\t = \frac{d}{v}

Some values ​​of interest for the speed of sound are

Medium          speed (m / s)

air                          340  

liquid            order of 1500  

Solids           order of 4000

In this exercise, the three students are at the same distance, so Elizabeth who hears the explosion through the ground ( solid) should be the person who first hears it.

For the other two students the time difference must be small, Samantha hears the explosive that is transmitted in the air.

Fulton uses headphones, so the explosion must excite a bugle that transforms the sound into signals for the headphones and again transforms it into audible signals.

The headphones are next to it. The time of the signal is the time in the air plus the time of the electrical signal, so you should hear the sound after Samatha.

In conclusion using the kinematics we can find that Elizabeth is the first to hear the sound and possibly Samantha is the second person to hear the explosion and Fulton the last since he has the time in the air plus the transformation time.

Learn more about sound here:

brainly.com/question/15137350

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A solution of aqueous ammonium sulfate has a mass of 482 grams. Calculate the mass of ammonium sulfate in solution if the mass p
umka2103 [35]

Answer:

The answer to your question is the mass of solute = 53.5 g

Explanation:

Data

mass of solution = 482 g

mass of solute = ?

mass percent = 11.1 %

Mass percent is a unit of concentration. It measures the mass of the solute divided by the total mass of the solution

Process

1.- Write the formula

        Mass percent = mass of solute / mass of solution x 100

-Solve for mass of solute

          mass of solute = Mass percent x mass of solution / 100

2.- Substitution

          mass of solute = 11.1 x 482 / 100

3.- Simplification

          mass of solute = 5350.2 / 100

4.- Result

          mass of solute = 53.5g

6 0
3 years ago
What mass of zinc (molar mass 65.4 g moll) does it take to produce 0.50 mole of H2(g)?
Hatshy [7]

Answer:

32.7 g of Zn

Explanation:

We'll begin by writing the balanced equation for the reaction. This is illustrated below:

Zn + 2HCl —> ZnCl₂ + H₂

From the balanced equation above,

1 mole of Zn reacted to produce 1 mole of H₂

Next, we shall determine the number of mole of Zn required to produce 0.5 mole of H₂. This can be obtained as follow:

From the balanced equation above,

1 mole of Zn reacted to produce 1 mole of H₂.

Therefore, 0.5 mole of Zn will also react to produce to 0.5 mole of H₂.

Thus, 0.5 mole of Zn is required.

Finally, we shall determine the mass of 0.5 mole of Zn. This can be obtained as follow:

Mole of Zn = 0.5 mole

Molar mass of Zn = 65.4 g/mol

Mass of Zn =?

Mass = mole × molar mass

Mass of Zn = 0.5 × 65.4

Mass of Zn = 32.7 g

Thus, 32.7 g of Zn is required to produce 0.5 mole of H₂.

4 0
2 years ago
5. Element X has two isotopes: X-100 and X-104. If the atomic mass of X is 101
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Answer:

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5 0
3 years ago
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Shtirlitz [24]
You must remember that oxidation number of hydrogen in acids is always +1, oxidation number of oxygen in oxides & acids is always -2... metals has always oxidation number on plus!

group NO3 comes from HNO3...and oxidation number of whole acid group is always on minus and equal to the amount of hydrogen atoms in this acid... so oxidation number of NO3 = -1

we have 2 NO3 groups so 2*(-1) = -2 and that is the reason why oxidation number of Fe in this formula must be +2... because sum of all elements always gives 0!

Now we could count of oxidation number for nitrogen... we write HNO3 and start counting from right to left:
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4 0
3 years ago
Atoms join together to form compounds bt gaining,loosing or sharing ​
user100 [1]

Answer:

the answer is C) sharing

Explanation:

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4 0
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