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3 years ago

List the three main things necessary to build an electromagnet.

Physics

1 answer:

Arturiano [62]3 years ago

7 0

Answer:

Electromagnets are special types of magnets that are made by passing current through coils of wire. To make an electromagnet, the minimum requirements are:

1. A nail (usually made of iron, steel or zinc)

2. Dry cell batteries

3. Wire (Usually copper wire)

Other things could be:

1. Electric tape to hold both ends of the wire properly at the battery terminals.

2. Scissors to cut the wire into desired length.

3. Iron fillings for testing purposes.

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Consider an object moving in the plane whose location at time t seconds is given by the parametric equations: x(t)=5cos(πt) y(t)

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Answer:

a = 1/5

b = 1/3

x(1/3) = 2.500

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Explanation:

Hi!

We can notice that

x(t)/5 = cos(πt)

y(t)/3 = sin(πt)

Therefore:

( x(t) / 5 )^2 + ( y(t) / 3 )^2 = cos^2(πt) + sin^2(πt) = 1

That is:

a = 1/5

b = 1/3

At t=1/3

x(1/3) = 5 cos(π/3)

y(1/3) = 3 sin(π/3)

But

cos(π/3) = 1/2 = 0.5

sin(π/3) = √3 / 2 = 0.866

That is:

x(1/3) = 2.5

y(1/3) = 2.598

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x'(t) = -5π sin(π t)

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