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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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To solve this problem we will begin by finding the pressure through density and average depth. Later we will find the Force, by means of the relation of the pressure and the area.

P = \rho h

Here,

h = Depth average

\rho = Density

Moreover,

\text{Density of water}= \rho = 62.4lb/ft^3

Replacing,

P = (62.4lb/ft^3)(\frac{35}{2}ft)

P = 1092 lb/ft^2

Finally the force

\text{Force} = \text{Pressure}\times \text{Area of dam with water acting on it}

F = 1092lb/ft^2(101ft*52ft)

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3 years ago
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masha68 [24]

1). both

2). Venus

3). Venus catastrophically; Earth too but much less.

4). Earth

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3 years ago
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Serga [27]

Answer: Third option

F = 250w

Explanation:

The impulse can be written as the product of force for the time interval in which it is applied.

I = F (t_2-t_1)

You can also write impulse I as the change of the linear momentum of the ball

I = mv_2 -mv_1

So:

F (t_2-t_1) = mv_2 -mv_1

We want to find the force applied to the ball. We know that

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The initial velocity v_1 is zero.

The final speed v_2 = 73.14\ m / s

So

F * 0.03 = 73.14m

F * 0.03 = 73.14m\\\\F=\frac{73.14m}{0.03}\\\\F=2438m

We must express the result of the force in terms of the weight of the ball.

We divide the expression between the acceleration of gravity

g = 9.8\ m / s ^ 2

F=\frac{2438m*g}{g},\ \ m*g=w\\\\g=9.8\ m/s^2\\\\F=\frac{2438w}{9.8}\\\\F=249w

The answer is the third option

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3 years ago
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Artemon [7]

Answer:

125 W

Explanation:

Power = work / time

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