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4 years ago

Why might an electromagnet be used to pick up old cars in junkyards?

Physics

2 answers:

siniylev [52]4 years ago

7 0

B) Hope it helps ,Have a nice day :)

Law Incorporation [45]4 years ago

6 0

<h3><u>Answer;</u></h3>

B) Electromagnets are powerful and can be turned on and off easily.

<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>

The strength of the electromagnet depends on the number of coils and also the size of the electric current through the coil.

<em><u>Its advantageous to use electromagnets as compared to using permanent magnets since they are powerful and can be turned on and off easily and also the strength of the electromagnet can be easily adjusted by regulating the amount of current flowing through the coils. </u></em>

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Distinguish between directly proportional and inversely proportional with an example of each

RideAnS [48]

Consider two variables said to be "inversely proportional" to each other. If all other variables are held constant, the magnitude or absolute value of one inversely proportional variable decreases if the other variable increases, while their product (the constant of proportionality k) is always the same.

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3 years ago

Long periods of unusually low precipitation are called?

DiKsa [7]

I think it is called a drought but i would look it up

6 0

4 years ago

The intensity of sound waves is linearly proportional to ?

Airida [17]

(1) The intensity of a sound wave is linearly proportional to the change in the pressure squared.

(2) You are able to hear sounds from farther away on a cool night because sound waves are refracted toward<u> </u><u>warmer air </u><u>near the ground.</u>

(3) When the trough of one wave collides at the same time & place of the crest of an identical wave, destructive interference occurs.

(4) The time taken for the heater to provide the energy is 300 secs.

(5) The total amount of heat provided to the ice sample is 7,980 cal.

(6) The amount of heat required to increase the temperature of water is 33,472 J.

<h3>Intensity of sound</h3>

The intensity of a sound wave is linearly proportional to the change in the pressure squared and inversely proportional to the density and the speed.

<h3>Refraction of sound waves</h3>

You are able to hear sounds from farther away on a cool night because sound waves are refracted toward warmer air near the ground.

<h3>Destructive inference</h3>

When the trough of one wave collides at the same time & place of the crest of an identical wave, destructive interference occurs.

<h3>Time taken for the heater to provide the energy</h3>

E = Power x Time

t = E/P

t = 60,000/200

t = 300 secs

<h3>Total amount of heat provided to the ice sample</h3>

Q = 79.8 cal/g x 100 g

Q = 7,980 cal

<h3>Amount of heat required to increase the temperature of water</h3>

Q = 0.1 kg x 4184 J/kgC x (100 - 20)

<em>When water vapor condense into liquid water, temperature = 100⁰C</em>

Q = 33,472 J

Thus, the intensity of a sound wave is linearly proportional to the change in the pressure squared.

You are able to hear sounds from farther away on a cool night because sound waves are refracted toward<u> </u><u>warmer air </u><u>near the ground.</u>
When the trough of one wave collides at the same time & place of the crest of an identical wave, destructive interference occurs.
The time taken for the heater to provide the energy is 300 secs.
The total amount of heat provided to the ice sample is 7,980 cal.
The amount of heat required to increase the temperature of water is 33,472 J.

Learn more about intensity of sound here: brainly.com/question/17062836

#SPJ1

7 0

2 years ago

Select all that apply.

stepan [7]

When a magnet is being pushed through a solenoid or when a magnet is being pulled out of a solenoid, a current would register on the galvanometer. The correct options among the three options that are given in the question are the first option and the third option. The magnet needs to be moved to generate the required current.

5 0

3 years ago

Read 2 more answers

Which of the following can penetrate the deepest (Please explain)

harkovskaia [24]

Answer: 3MeV electron

Explanation:

m_e={9.1\times 10^{-31} m_α=4\times m_e m_a={9.1\times 10^{-31}

m_p=1.67\times 10^{-27}

(a) K.E. Energy of electron = $\frac{1}{2}\times{m_e}\times{v_{e} ^{2}}$ =3MeV

$v_{e} ^{2}=\frac{2\times3\times1.6\times10^{-19}\times10^{6} }{9.1\times 10^{-31} }$ =1.05\times10^{18}

$v_e=\sqrt{1.05\times10^{18} } = 1.025\times10^{9}\frac{m}{s}$

(b) K.E. Energy of alpha particle = $\frac{1}{2}\times{m_\alpha}\times{v_{\alpha} ^{2}}$ =10MeV

$v_{\alpha} ^{2}= \frac{2\times10\times1.6\times10^{-19}\times10^{6} }{4\times9.1\times 10^{-31} }$ =0.88\times10^{18}

$v_\alpha=\sqrt{0.88\times10^{18} } =.94\times10^{9}\frac{m}{s}$

$v_{a} ^{2}=\frac{2\times0.1\times1.6\times10^{-19}\times10^{6} }{9.1\times 10^{-31} }$ =0.035\times10^{18}

$v_a=\sqrt{0.035\times10^{18} } =.19\times10^{9}\frac{m}{s}$

(d) K.E. Energy of proton particle = $\frac{1}{2}\times{m_p}\times{v_{p} ^{2}}$ =400keV

$v_{p} ^{2}=\frac{2\times400\times1.6\times10^{-19}\times10^{3} }{1.67\times 10^{-27} }$ =0.766\times10^{14}

$v_p=\sqrt{0.766\times10^{14} } =0.875\times10^{7}[tex]\frac{m}{s}$

from (a),(b),(c),and (d) we can clearly say that the velocity of the electron is more so the penetration of the electron will be deepest.

6 0

3 years ago