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3 years ago

A _____ is used in a motor to switch the direction of the magnetic field created by the current.

Physics

1 answer:

insens350 [35]3 years ago

8 0

Answer:

A _commutator_ is used in a motor to switch the direction of the magnetic field created by the current.

The rotating part of a motor that holds the electromagnets is called the __armature___.

Electric current passes through the _brushes_ and into the electromagnets in an electric motor.

A motor turns _electrical_ energy into _mechanical_ energy.

Explanation:

A commutator, which is a split ring rotary switching device, reverses the direction of the current between the external circuit and the rotor. Reversing the current reverses the magnetic field.

The armature comprises the rotating part of the motor and the electromagnets

A brush is the electrical contact for conducting current through the moving and stationary parts of an electric motor

An electric motor turns electrical energy into mechanical energy.

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Which statement best describes beaches? Beaches change over time as waves move further up the shore. Beaches are always changing

NemiM [27]

Answer:

I think the 1st statement is right.

Explanation:

Wind patterns doesn't stay the same.

Waves don't follow the same patterns.

Waves move further up the shore.

I didn't hear about "waves adding" before..so i guess 1st statement is right.

3 0

3 years ago

A vessel at rest at the origin of an xy coordinate system explodes into three pieces. Just after the explosion, one piece, of ma

Oksanka [162]

Answer:

Explanation:

The momentum of the first piece = m v =- m x 31 i kg m/s in - x direction direction

The momentum of the second piece = -m x 31 j kg m /s in Y - direction

Total momentum = - 31 m( i + j )

To conserve momentum , the third piece must have momentum equal to this

and opposite to it

So momentum of the third piece = 3m x V = 31 m ( i +j )

V = 31/3 ( i + j ) =

Magnitude of velocity V = √2 x 31/ 3 = 14.6 m / s

Its direction will be towards the vector i + j ie 45° from x - axis in positive direction

4 0

3 years ago

if 6000j of energy is supplid to a machine to lift a load of 300N through a vvertical height of 1M calculatework out put

kari74 [83]

Answer:

300J

Explanation:

Work done = Force x the distance travelled in the direction of the force

=300 x 1

=300J

8 0

2 years ago

Which of the following types of electromagnetic radiation has longer wavelengths than visible light?

irina [24]

The answer to your question would be A. infrared light

4 0

2 years ago

How long does it take the Sun to melt a block of ice at 0∘C with a flat horizontal area 1.0 m2 and thickness 2.0 cm ? Assume tha

sineoko [7]

Answer:

It takes 40 hours to melt the block of ice.

Explanation:

According to the principles of radiation and heat transfer respectively:

ΔQ = I(dt)eAcosθ (I = Solar energy density; dt = time taken; e = emissivity; A = Area of block; θ = angle between the sun ray and the horizontal)

ΔQ = mLf (ΔQ = Heat change; m = mass of ice; Lf = Specific latent heat of fusion of ice)

but m = ρV = ρ.A.dx, therefore, the heat transfer equation can be re-written as:

ΔQ = ρ.A.dx.Lf

Lets equate the radiation equation and the modified heat transfer equation, we have:

ρ.A.dx.Lf = I(dt)eAcosθ

ρ.dx.Lf = I(dt)ecosθ (Striking out the area)

Let's make dt the subject of formula,

dt = ρ.dx.Lf /I.e.cosθ

ρ = Density of ice, $9.2x10^{2} Kg/m^{3}$

Lf = $3.36x10^{5} J/Kg$

e = 0.050

θ = 32 deg. C

Now, let's substitute the terms:

$dt=\frac{(9.2x10^{2})(0.02)(3.36x10^{5} ) }{(1000)(0.050)(cos32)}$

$dt=14.45x10^{4} s = \frac{14.45x10^{4}}{3600} hr=40.14 hr$

Therefore, the time taken for the ice to completely melt is 40 hours (Two significant figures)

4 0

2 years ago