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Troyanec [42]
4 years ago
15

Every action force has an opposite and equal reaction force. Determine which of these are action/reaction pairs. Check all that

apply. A girl leans against a wall and the wall pushes on the girl. A baseball hits a glove and the glove pushes on the ball. A boy pushes on a door and the door swings open. A soccer player kicks a ball and then another soccer player kicks the same ball. A cat rubs up against a tree and the tree pushes against the cat. A student pushes another student standing in a line, and that student falls into the next student.
Physics
2 answers:
Misha Larkins [42]4 years ago
8 0

Answer:

A girl leans against a wall and the wall pushes on the girl.

A baseball hits a glove and the glove pushes on the ball.

A cat rubs up against a tree and the tree pushes against the cat

Explanation:

These are all right for Physics on Edge

denis23 [38]4 years ago
3 0

A girl leans against a wall and the wall pushes on the girl.

A baseball hits a glove and the glove pushes on the ball.

A cat rubs up against a tree and the tree pushes against the cat

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In terms of the dc current I, how much magnetic energy is stored in the insulating medium of a 3- m-long, air –filled section of
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Answer:

The answer is 138.5

Explanation:

STEP 1:

The inductance per unit length of a coaxial transmission line is

L′=L<em>/ </em>I

 =Ø/H

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In this a is the radius of inner conductor

b is the radius of outer conductor

I is the coaxial transmission

μ is the magnetic permeability

Since the transmission of the charge exists in air, the value of the relative permeability is μr= I and permeability of free space is μo=  4π x 10-7 H/m . So the magnetic permeability will be

μ = μoμ r

μ =μ o(I) 4π x 10-7 H/m

L′= μoI/2π In (b/a)

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  =2.77 x 10-7 H

STEP 2:

Obtain the magnetic energy stores in the magnetic field H of a volume of the coaxial transmission line containing a material with permeability μ, by using the formula given below:

Wm= 1/2 LI^2

      = 1/2 (2.77x 10^-7 I^2

      = 138.5 X 10^-9 I^2 J

      Now we will simplify the equation

Wm= 185.5<em>I</em>^2 nJ

So, the magnetic energy stored in insulating medium is 185.5<em>I</em>^2 nJ

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Answer:

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