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uranmaximum [27]
4 years ago
13

How long does it take electrons to get from the car battery to the starting motor? Assume the current is 143 A and the electrons

travel through copper wire with cross sectional area 40.2 mm2 and length 84.5 cm . The mass density of copper is 8960 kg/m3 and the molar mass is 63.5 g/mol . Avogadro’s number is 6.022 × 1023 . Assume that each copper atom contributes one conduction electron.
Physics
1 answer:
Ostrovityanka [42]4 years ago
5 0

Answer

the concentration of electron/ volume (n) = 8.5 × 10²⁸ /m³

the drift velocity of electron

v = \dfrac{I}{neA}

v = \dfrac{143}{8.5\times 10^{28}\times 1.6\times 10^{-19}\times 40.2 \times 10^{-6}}

v = 2.615 × 10⁻⁴ m/s

time require is

t=\dfrac{L}{v}

t=\dfrac{0.845}{2.615\times 10^{-4}}

t = 3231.35 s

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stiks02 [169]

Answer:

The decrease in decibels is 0.1 dB.

Explanation:

Let the intensity of one chorus is Io.

let the intensity of 1000 vocalist is dB.

The intensity of 1000 vocalist is 1000 Io.

dB = 10log\frac{1000Io}{Io}=30..... (1)

let the intensity of 999 vocalist is dB'.

dB' = 10log\frac{999Io}{Io}=29.9..... (2)

So, the change is

= dB - dB' = 30 - 29.9 = 0.1 dB

6 0
3 years ago
A substance freezes at -58c therefore substance melts at ?
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If it freezes at -58°C, hence the melting point is also <span>-58°C.</span>
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3 years ago
If you are an astronaut in the middle of the near side of the moon during a full moon,how would the ground around you look?How w
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3 0
3 years ago
Read 2 more answers
A car accelerates from 20.0 m/s to 28.0 m/s over a distance of 50.0 m. What is the car’s acceleration?
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Answer:

Explanation:

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28^2=20^2+2a(50)\\784=400+100a\\384=100a\\a=3.84m/s^2

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3 years ago
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hope this helps
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