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g100num [7]
3 years ago
12

A student uses a bar magnet to pick up a nail. He then touches the tip of the nail to some staples. Why do some of the staples s

tick to the nail? The nail and the bar magnet are now both permanent magnets. The nail has become a temporary magnet, while the bar magnet remains a permanent magnet. The nail has become a permanent magnet, while the bar magnet has become a temporary magnet. The nail and the bar magnet are now both temporary magnets.
the answer is the nail has become a temporary magnet
Physics
2 answers:
adell [148]3 years ago
8 0

Answer:

B, The nail becomes a temp. magnet while the bar magnet remains a permanent magnet

Explanation:

Did it on edgen just now

skad [1K]3 years ago
3 0

Answer:

The nail has become a temporary magnet, while the bar magnet remains a permanent magnet.

Explanation:

  • When the bar magnet takes off the nail, it magnetizes the nail. The fingerprint domains are temporarily aligned in one direction and act as a magnet. The nail becomes a temporary magnet. Therefore, when the tip of the nail hits a few staples, the lead attracts the nail and sticks to it.
  • so correct option is b. The nail has become a temporary magnet, while the bar magnet remains a permanent magnet.
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A force of 50 N was necessary to lift a rock. A total of 150 J of work was done. How far was the rock lifted? ​
Kitty [74]

Answer:

\boxed {\boxed {\sf 3 \ meters}}

Explanation:

Work is the product of force and distance.

W=F*d

We know the force to lift the rock was 50 Newtons. The work was 150 Joules.

  • 1 Joule is equal to 1 Newton meters.
  • We can convert the units to make the problem simpler later. The work is also 150 Newton meters.

W= 150 \ N*m \\F= 50 \ N

Substitute the values into the formula.

150 \ N*m= 50 \ N * d

We want to solve for distance, so we must isolate the variable. Divide both sides of the equation by 50 Newtons.

\frac{150 \ N*m}{50 \ N }=\frac{50 \ N * d}{50 \ N }

The Newtons will cancel out.

\frac{150 \ m }{50} =d \\3 \ m =d

The rock was lifted <u>3 meters.</u>

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