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Liono4ka [1.6K]
2 years ago
10

Plz do it all i will give brainlest and thanks to best answer.

Physics
2 answers:
Natasha_Volkova [10]2 years ago
7 0
It’s a because metal is a good heat conductor and I don’t see any other questions on there
maxonik [38]2 years ago
4 0
Its a, metal is a good conductor of heat so yea
Hope this helps :)
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Which of the following waves have the longest wavelengths?
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Radio waves have the longest wavelengths
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Select the correct answer from each drop-down menu. A device that uses electricity and magnetism to create motion is called a __
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<h3><u>Answer;</u></h3>

1st drop; Motor

2nd drop; Electricity

A device that uses electricity and magnetism to create motion is called a <u>motor</u>. In a reverse process, a device that uses motion and magnesium can be used to create <u>electricity</u>.

<h3><u>Explanation</u>;</h3>
  • <em><u>Motors are device which use electricity and magnetism to create motion.</u></em> They pass alternating current through opposing pairs of magnets to create a rotating magnetic field which creates a magnetic field in the rotor of a motor, making it to spin around.
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Which statement about the effects of medium on the speed of a mechanical wave is true?
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C. A mechanical wave generally travels faster in gases than liquids.

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A book is sliding across a horizontal desk and comes to a stop. the books kinetic energy was converted into what type of energy
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The magnetic field at 8 cm distance from a long straight wire, carrying is 0.2x10^-5 T. How much is the electric current in the
FrozenT [24]

Answer:

The electric current in the wire is 0.8 A

Explanation:

We solve this problem by applying the formula of the magnetic field generated at a distance by a long and straight conductor wire that carries electric current, as follows:

B=\frac{2\pi*a }{u*I}

B= Magnetic field due to a straight and long wire that carries current

u= Free space permeability

I= Electrical current passing through the wire

a  = Perpendicular distance from the wire to the point where the magnetic field is located

Magnetic Field Calculation

We cleared (I) of the formula (1):

I=\frac{2\pi*a*B }{u} Formula(2)

B=0.2*10^{-5}  T = 0.2*10^{-5} \frac{weber}{m^{2} }

a  =8cm=0.08m

u=4*\pi *10^{-7} \frac{Weber}{A*m}

We replace the known information in the formula (2)

I=\frac{2\pi*0.08*0.2*10^{-5}  }{4\pi *10x^{-7} }

I=0.8 A

Answer: The electric current in the wire is 0.8 A

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