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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Name at least three physical properties of the bowling ball.

oksian1 [2.3K]

Density - Describes how compact the matter is in a substance. ...
Color - Describes how light reflects off a substance.
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3 years ago

Read 2 more answers

Without water's hydrogen bonds, which

brilliants [131]

Answer:

A. Water would be a gas at room temperature, and

D. Ice would sink in water.

Explanation:

There are three types of intermolecular forces: London dispersion forces, dipole-dipole interactions, and hydrogen bonds. The relative strength of these forces depend on the size of the molecule. However, for small molecules like water (three atoms per molecule,) hydrogen bonds would be much stronger than the other two types of forces.

Without hydrogen bonds, water molecules would be held together only with dipole-dipole interactions and London dispersion forces. To get an idea of what that would be like, consider hydrochloric acid $\rm HCl$ .

$\rm HCl$ and water $\rm H_2O$ contain about the same number of electrons. The H-Cl bond in $\rm HCl$ is polar, which allows for dipole-dipole interactions. However, only H-O, H-F, and H-N bonds allow for hydrogen bonding. As a result, there won't be any hydrogen bonding between $\rm HCl$ molecules. Without hydrogen bonding, $\rm HCl$ boils at well below $\rm 0\; ^\circ C$ under standard pressure. It is a gas at room temperature under standard pressure. That's about the same as what water molecules would behave (physically) without any hydrogen bonds between them.

Also because of hydrogen bonding, the density of ice (solid $\rm H_2O$ ) is typically greater than that of water (liquid $\rm H_2O$ .) When compared to water in its liquid state, there are more hydrogen bondings between molecules of water in its solid state. The hydrogen bonds hold the molecules together to form a lattice. Because of this structure due to hydrogen bondings, the molecules are farther apart than they are in the liquid states. As a result, the density of ice is typically smaller than that of water. That would likely not be the case if there was no hydrogen bondings between water molecules.

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3 years ago

PLEAS HELP A football player kicks a ball with a mass of 0.42 kg. The average acceleration of the football was 14.8 m/s². How mu

Orlov [11]

Answer:

The force that the football play kicked the ball with was 6.22n

Explanation:

The reason why it is 6.22N is because when you use the formula, F =MA

and you plug the numbers in, it eaquals 6.22n.

F=0.42*14.8

6 0

3 years ago