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Fed [463]
3 years ago
9

An electromagnet is a ? with a ? core

Physics
2 answers:
natima [27]3 years ago
8 0

Answer:

An electromagnet is a magnet which attracts metals only when electrically activated.

Vlada [557]3 years ago
3 0
A electromagnet is soft metal core made into a magnet by the passage of electric current through a coil surrounding it.

Brainiest plz
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Why are units of measurement useful?
Zanzabum

Without the ability to measure, it would be difficult for scientists to conduct experiments or form theories. Not only is measurement important in science and the chemical industry, it is also essential in farming, engineering, construction, manufacturing, commerce, and numerous other occupations and activities.

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3 years ago
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Suddenly a worker picks up the bag of gravel. Use energy conservation to find the speed of the bucket after it has descended 2.3
fiasKO [112]

Explanation:

A worker picks up the bag of gravel. We need to find the speed of the bucket after it has descended 2.30 m from rest. It is case of conservation of energy. So,

\dfrac{1}{2}mv^2=mgh\\\\v=\sqrt{2gh}

h = 2.3 m

v=\sqrt{2\times 9.8\times 2.3} \\\\v=6.71\ m/s

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3 years ago
Which part of an atom is mostly empty space?
Veronika [31]

Answer:

The electron cloud is mostly empty space

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Which of these factors will increase the speed of a sound wave in air?
Artemon [7]
<h3>Answer;</h3>

-Temperature

<h3><u>Explanation;</u></h3>
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3 years ago
The three mountains task examines the development of
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Answer:

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Explanation:

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