3 years ago

Give reason 1.electromagnets are temporary magnets ?

1 answer:

6 0

they need electricity in order to attract metal. if there's no electric current it would not be able to attract any type of metal.

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Anna71 [15]

Answer:

<em>The answer is B</em>

Explanation:

<em>I got this from study island</em>

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olga2289 [7]

Time period = 1 / frequency
Time period = 1 / 250 th of a second

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Nastasia [14]

A. By asking them to go outside and study real snowflakes.

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babymother [125]

Answer:

860.6 years.

Explanation:

The parameters given are;

Initial detector activity = 370000 alpha decays per second

Final detector activity = 93000 alpha decays per second

Formula for time to change in activity is given by the following relation;

$t_{93000} = \dfrac{-ln\dfrac{A}{A_0} }{\lambda} = \dfrac{-ln\dfrac{93000}{370000} }{5.08 \times 10^{-11}} = 2.72 \times 10^{10} \, seconds$

t₉₃₀₀₀ = 2.72 × 10¹⁰ seconds = 860.6 years.

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Feliz [49]

The pulled back string on an archer’s bow.

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