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prohojiy [21]
2 years ago
8

10POiNTS!!! SPACE QUESTION!

Physics
1 answer:
Flura [38]2 years ago
7 0
Pretty sure it’s mercury
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A metallic wire has a diameter of 4.12mm. When the current in the wire is 8.00A, the drift velocity is 5.40×10−5m/s.What is the
podryga [215]

Answer:

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

Explanation:

We are given that

Diameter of wire=d=4.12 mm

Radius of wire=rr=\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

Density of free electrons=6.9\times 10^{28}m^{-3}

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3 years ago
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Which statement is a scientific theory?
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Answer:

A.

Explanation:

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A 2.5 kg table can hold kg of weight. what is its structural efficiency?
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It's (whatever number comes after 'hold') divided by 2.5 .
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The animal that is hunted and consumed is considered the prey

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When an atom that has no charge loses two electrons, it becomes a
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positive ion

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due to the fact it loses electrons there is 2 more protons than electrons

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