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BigorU [14]
3 years ago
15

Which is an important step in how an electric motor uses magnetic force to produce motion?

Physics
2 answers:
lawyer [7]3 years ago
8 0

Answer:

B. As the north pole of the electromagnet nears the south pole of the permanent magnet, the current reverses and the poles of the magnets then repel.

Explanation:

Romashka [77]3 years ago
7 0
The basic idea of an electric motor is really simple: you put electricity<span> into it at one end and an </span>axle<span> (metal rod) rotates at the other end giving you the power to drive a machine of some kind. Hope this helps. Have a nice day. Feel free to ask more questions.</span>
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A force of 30 N is applied tangentially to the rim of a solid disk of radius 0.10 m. The disk rotates about an axis through its
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Answer:

m = 4.0 Kg

Explanation:

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       \tau_{ext} = I* \alpha (1)

  • Since the magnitude of the torque is the product of the value of the force times the perpendicular distance between the line of action of  the force and the axis of rotation, and the force is tangential to the rim of the disk, we can write the following expression:

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  • Replacing (3) in (1), and (2) in the left side of (1) also, we can solve for m, as follows:

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7 0
3 years ago
A 4kg watermelon is dropped from a height of 45m. What is the velocity of the watermelon just before it hits the ground?
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Answer:

v=30 m/s

Explanation:

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g - acceleration due to gravity=10

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45 = 5t²

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