2 years ago

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

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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= $\pi r^2$

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

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

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Which statement is a scientific theory?

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Answer:

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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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positive ion

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

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