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Black_prince [1.1K]
3 years ago
9

You plug in an extension cord and have to be very careful around the electrical outlet. However, you can handle the extension co

rd without worry of being shocked by the electrical charge. Which statement best explains why you can do this?
(A) The cord is made of a combination of materials which are both good conductors of electricity. The combination of two conductors directs the flow of electricity away from you and down the cord.
(B) The extension cord is made of plastic which only conducts electricity for a certain period of time. If you handle the cord, the electricity passes through it so fast that you are not in danger of being shocked.
(C) The extension cord is made of copper wire, which is a good conductor of electricity; however, it is covered with plastic, an insulator, which does not allow the electrical current to flow to you.
(D) The cord has a plastic cover which is a good conductor of electricity so it carries the electrical current away from your hand which is an insulator
Physics
2 answers:
Sati [7]3 years ago
5 0

I got the answer C, <em>The extension cord is made of copper wire, which does not allow the electric current to flow to you.</em>

<em />

Hope this helped!

-Sincerely, Simply

a_sh-v [17]3 years ago
3 0
I believe that the best statement which explains why you can do this is C. <span>The extension cord is made of copper wire, which is a good conductor of electricity; however, it is covered with plastic, an insulator, which does not allow the electrical current to flow to you.
Copper is known to be one of the best conductors of electricity, and plastic can shield you from shock.

</span>
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P=\sigma A T^{4} (1)  

Where:  

P=300J/min=5J/s=5W is the energy radiated by a blackbody radiator per second, per unit area (in Watts). Knowing 1W=\frac{1Joule}{second}=1\frac{J}{s}

\sigma=5.6703(10)^{-8}\frac{W}{m^{2} K^{4}} is the Stefan-Boltzmann's constant.  

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T=727\°C=1000.15K is the effective temperature of the body (its surface absolute temperature) in Kelvin.

However, there is no ideal black body (ideal radiator) although the radiation of stars like our Sun is quite close.  So, in the case of this body, we will use the Stefan-Boltzmann law for real radiator bodies:

P=\sigma A \epsilon T^{4} (2)  

Where \epsilon is the body's emissivity

(the value we want to find)

Isolating \epsilon from (2):

\epsilon=\frac{P}{\sigma A T^{4}} (3)  

Solving:

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Finally:

\epsilon=0.17 (5)  This is the body's emissivity

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