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alexandr402 [8]
3 years ago
15

Which two statements are true? Select all that apply. Select one or more: a. A moving magnetic field creates an electric field.

b. A constant magnetic field creates an electric field. c. A constant electric field creates a magnetic field. d. A moving electric field creates a magnetic field.
Physics
2 answers:
ElenaW [278]3 years ago
7 0

The answers are B, C, & D.

omeli [17]3 years ago
6 0
<span>2. An electric current in a conductor creates a magnetic field at all points in the surrounding region.
3. A permanent magnet creates a magnetic field at all points in the surrounding region.
4. A moving electric charge creates a magnetic field at all points in the surrounding region.</span>
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| A 1.0 kg stone is dropped from a bridge 100 m above a canyon. What will be the kinetic energy of the stone after it
Mnenie [13.5K]

Answer:

Option D

490 J

Explanation:

When at a height of 100 am above and released, the ball initially posses only potential energy. When it falls, some potential energy is converted to kinetic energy.

Initial potential energy= mgh where m is the mass, g is the acceleration due to gravity and h is height. Substituting 1 Kg for m, 9.81 for g and 100 m for h then

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8 0
4 years ago
How far must you be from a 110 W speaker to have an intensity of 0.0439 W/m^2? (Treat the speaker as a point source.)
Lina20 [59]

Answer:

d=14.12m

Explanation:

Assume a point sound source that emits a sound power<em> P </em>(in W) evenly in all directions of space. Let us also assume that the medium does not absorb this sound power when it passes through it. At a distance<em> d </em>from the source this power will have been evenly distributed over the surface of a sphere of radius <em>d</em>. Therefore, the acoustic intensity I at distance d will be worth:

I=\frac{P}{4\pi d^{2}}

This is the expression of the so-called<em> law of the square of distance: "the intensity is inversely proportional to the square of the distance to the source (considered punctual)".</em>

So

I=0.0439 \frac{W}{ m^{2}}

P=110W

d=\sqrt { \frac{P}{4 \pi\\I}

d=\sqrt{ \frac{110}{ 4\pi (0,0439)} }

d=\sqrt{{199.39}

d=14.12m

3 0
3 years ago
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