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miskamm [114]
3 years ago
6

An electromagnet is a device in which moving electric charges (current) in a coil of wire create a magnet. What’s one advantage

of using electromagnets in devices? A Electromagnets have a strong, constant magnetic field. B Electromagnets are more powerful than permanent magnets. C Electromagnets don’t need a source of electricity to work. D Electromagnets can easily be turned on and off.
Physics
2 answers:
yan [13]3 years ago
7 0
I think the correct answer from the choices listed above is option D. One advantage of using electromagnets in devices would be that electromagnets can <span>easily be turned on and off. Hope this answers the question. Have a nice day.</span>
spin [16.1K]3 years ago
5 0
<h3><u>Answer;</u></h3>

D Electromagnets can easily be turned on and off.

<h3><u>Explanation;</u></h3>
  • <em><u>Electromagnets are made by winding a wire through a magnetic material such as soft iron core making a coil, and then passing electric current through the coil thus making the soft iron core magnetic.</u></em>
  • <em><u>The strength of the electromagnet depends on the number of coils and also the size of the electric current through the coil.</u></em>
  • Permanent or regular magnets on the other hand do not require power but depends on the type of material used to make it.
  • Therefore, <em><u>its advantageous to use electromagnets as compared to using permanent magnets since the strength of the electromagnet can be easily adjusted by regulating the amount of current flowing through the coils. </u></em>Thus, the electromagnet can be adjusted for have different levels of magnetic fields.
<h3><u /></h3>
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Answer:

Answer is C

Explanation:

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I have attached a simple diagram below, the y axis is the energy and x axis being the time (where t = 0 is the pendulum starting from max height left of the equilibrium). The green curve the the GPE and blue curve is KE. Red line shows that at all times the energy is constant.

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2 years ago
A man standing on the Earth can exert the same force with his legs as when he is standing
statuscvo [17]

Answer:

No

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-- So, it reaches the speed of 30 m/s in (30/9.8) = 3.06 seconds after it's dropped.

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D = (4.9 m/s²) (9.37 sec²)

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Now I'll go a little farther for you !  Writing the last paragraph made me a little curious and uncomfortable.  So I went and looked up the world's tallest buildings . . . and I found out that this problem could never happen !

The tallest building in the world now is the Burj Khalifa, in  Dubai.  It has 163 floors, and it's 828 meters high !  That's 2,717 feet.  It's gonna be a long time before there's a building that's 1125 meters tall, like this problem says.  That's close to 3700 feet . . . I've had flying lessons where I wasn't that far off the ground !

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kondor19780726 [428]
Conservation in this case means that it doesn't change. Momentum isn't created or destroyed, but it remains constant.
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