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Vanyuwa [196]
3 years ago
14

Newton's first law equations like velocity and stuff like that

Physics
1 answer:
Klio2033 [76]3 years ago
4 0

Answer:

Newton's first law: An object at rest remains at rest, or if in motion, remains in motion at a constant velocity unless acted on by a net external force. ... An object sliding across a table or floor slows down due to the net force of friction acting on the object.

Explanation:

please give me a heart

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Which law of physics relates electric fields and current
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Explanation:

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What is the voltage across a semiconductor bar if the current through it is 0.17 A? The electron concentration in the bar is 2.7
Anastaziya [24]

Answer:

The voltage across a semiconductor bar is 0.068 V.

Explanation:

Given that,

Current = 0.17 A

Electron concentration n= 2.7\times10^{18}\ cm^{-3}

Electron mobility \mu=1000 cm^2/Vs

Length = 0.1 mm

Area = 500 μm²

We need to calculate the resistivity

Using formula of resistivity

\sigma=n\times q\times \mu

\rho=\dfrac{1}{\sigma}

Put the value into the formula

\rho=\dfrac{1}{2.7\times10^{18}\times10^{6}\times1.6\times10^{-19}\times1000\times10^{-4}}

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We need to calculate the resistance

Using formula of resistance

R=\dfrac{\rho l}{A}

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R=0.4\ \Omega

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Using formula of voltage

V= IR

Put the value into the formula

V=0.17\times0.4

V=0.068\ V

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