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2 years ago

When asked how to create an electromagnet, the best answer would be:

Physics

1 answer:

fredd [130]2 years ago

4 0

Answer:

You can create an electromagnet by wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current."

Explanation:

Electromagnets are made by wrapping an insulated wire around a metal with ferromagnetic properties (example is iron), to form a loop, and then applying a current through the wire. Electromagnets can generate magnetism with a strong force field, and unlike normal magnets, their strength can be varied by varying the amount of current flowing through the coil. Their main disadvantage, which is also their most utilized property is that their magnetism is lost once the current flowing through the wire is cut-off.

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A spring has a spring constant of 80 N/m. How much energy is stored in the spring when it is compressed 0.2 m past its natural l

Paha777 [63]

The energy of a compressed (or stretched) spring is given by

$E= \frac{1}{2} k x^{2}$

This gives

$E= \frac{1}{2}80* 0.2^{2} =1.6J$

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3 years ago

Two balls are placed near one another and hang down, as shown below.

Delicious77 [7]

Answer:

<h2>a- neither ball has a charge</h2>

Explanation:

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2 years ago

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However, had it been a real sound, the sound's pitch would have been increased by the Doppler Effect, since the Falcon was movin

kkurt [141]

I believe the answer is C.

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3 years ago

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According to Boyles’ law, PV = constant. If a graph is plotted with the pressure P against the volume V, the graph would be a(n)

Hunter-Best [27]

Answer:

C. hyperbola

Explanation:

From Boyle's law:

PV = k, where k is a constant

Solving for P:

P = k / V

At first glance, this equation doesn't fit any of the options. But when you graph it, you can see that it's actually a <em>rotated</em> hyperbola.

4 0

3 years ago

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A "mechanical wave" occurs in a physical medium because of some restoring force acting on the medium, and can be described by an

hram777 [196]

Answer:

(A) The ratio between the restoring force and the density of the medium remain constant

Explanation:

The ratio between the restoring force and the density of the medium is equal to the square of the velocity of the wave.

$v = \sqrt{\frac{F}{\mu}}$

The general formula that relates the displacement and velocity (x = vt) can be written in wave mechanics such that

$v = \lambda f$

where f is the frequency, λ is the wavelength, and v is the velocity of the wave.

According to this equation, in order to halve the wavelength by doubling the frequency, the velocity should be constant. Therefore, the correct answer is (A).

3 0

2 years ago