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3 years ago

Can someone help me with this science question

Physics

2 answers:

Anettt [7]3 years ago

6 0

Mechanical layers of the earth:

-Lithosphere
-Asthenosphere
-Mesosphere
-Outer Core
-Inner Core

Chemical layers of the earth:

-Crust
-Mantle
-Core

Hope this helps

Have a great weekend! :)

Afina-wow [57]3 years ago

5 0

A.Answers is crust metal and rust hopes this helps you

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Answer:

$6.9\times 10^{28}m^{-3}$

Explanation:

We are given that

Diameter of wire=d=4.12 mm

Radius of wire=r $r=\frac{d}{2}=\frac{4.12}{2}=2.06mm=2.06\times 10^{-3} m$

$1mm=10^{-3} m$

Current=I=8 A

Drift velocity= $v_d=5.4\times 10^{-5} m/s$

We have to find the density of free electrons in the metal

We know that

Density of electron= $n=\frac{I}{v_deA}$

Using the formula

Density of free electrons= $\frac{8}{5.4\times 10^{-5}\times 1.6\times 10^{-19}\times 3.14\times (2.06\times 10^{-3})^2}$

By using Area of wire= $\pi r^2$

$\pi=3.14\\e=1.6\times 10^{-19} C$

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3 years ago

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4 years ago

A certain sound is recorded by a microphone. The same microphone then detects a second sound, which is identical to the first on

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Answer:

Loudness of the second sound is more than the first one.

Explanation:

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Explanation:

Step 1:

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Step 2:

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Step 3:

Since the pressure pushing up mercury and water is the same

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