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alexandr402 [8]
3 years ago
12

In an electric motor, periodically changing the direction of current in the electromagnet can cause the axle to spin because

Physics
2 answers:
loris [4]3 years ago
5 0

Answer:

The magnetic field reverses direction.

Explanation:

Andru [333]3 years ago
4 0

Answer:

D The magnetic field reverses direction.

Explanation:

An electric motor works based on the principle of electromagnetic induction. It is the interaction of electric current and the magnetic field that makes a motor function.

An electric motor is a machine that will convert the electric energy to mechanical energy. In this a commutator is used to change the direction of current.

When the direction of flow of current is made to change, the magnetic field also reverses the direction.

There are different types of motors like AC motor,DC motor, Induction motor etc.

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A satellite dish is in the shape of a parabolic surface. Signals coming from a satellite strike the surface of the dish and are
RSB [31]

Answer: 6.125 ft

Explanation:

If this dish has the form of a concave upward parabola and its vertex p is at the origin, its corresponding equation is:

x^{2}=4py

Where:

x is the radius, which can be found by dividing the diameter d=14 ft by half. Hence x=\frac{d}{2}=\frac{14 ft}{2}=7 ft

y=2 ft is the depth

p is the vertex of the parabola, where its base is

Finding p:

p=\frac{x^{2}}{4y}

p=\frac{(7 ft)^{2}}{4(2 ft)}

Finally:

p=6.125 ft This is where the the receiver should be placed

3 0
3 years ago
Make the following conversion: 34.9 cL = _____ hL
aliina [53]
We know that: 1 L = 100 cL. Or 1 cL = 0.01 L. Then we will make the conversion: 34.9 cL = 34.9 / 100 L = 0.349 L. Also: 1 hL = 100 L. 0.349 L = 0.349 / 100 hL = 0.00349 hL. This can be also written as: 3.49 * 10^(-3) hL ( in the scientific notation ). Answer: 3.49 cL = 0.00349 <span>hL </span>
8 0
4 years ago
7. Explain why observations of comets and shooting stars presented challenges to ancient astronomers using
Lelu [443]

According to Ptolemy's model, he, too, believed in a geocentric Universe and that the planets and stars were perfect spheres, though Earth itself was not.

He further thought that the movements of the planets and stars must be circular since they were perfect and, if the motions were circular, then they could go on forever.

<h3>What is comets and shooting stars?</h3>

Shooting stars are very different from comets, although the two can be related. A Comet is a ball of ice and dirt, orbiting the Sun (usually millions of miles from Earth). ... A shooting star on the other hand, is a grain of dust or rock (see where this is going) that burns up as it enters the Earth's atmosphere.

Learn more about ptolemy's model:

brainly.com/question/12639459

3 0
3 years ago
Which of the following is not sublimable? *
galina1969 [7]

Answer:

where is your option ?

you can't write option so I think

sodium chloride is not sublimable

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4 years ago
What organ system sends signals from the brain to the muscles?
AlladinOne [14]
C. nervous system, because its triggers 
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