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svlad2 [7]
3 years ago
15

In order to generate electricity from mechanical energy, one essential element needed to transform the energy into electrical en

ergy is?
A) a steam turbine.
B) a mechanical linkage.
C) a large piece of iron.
D) a magnet or magnetic field.
Physics
2 answers:
Delvig [45]3 years ago
6 0
Hey there!

In order to generate electricity from mechanical energy, one essential element needed to transform the energy into electrical energy is a magnet or magnetic field

Hope this helps! :)
frutty [35]3 years ago
6 0

Answer:

D) a magnet or magnetic field.

Explanation:

Electricity can be generated from mechanical energy due to a phenomenon called electromagnetic induction.

This phenomenon occurs when the magnetic flux (due to the presence of a magnetic field) through an enclosed circuit is changed: when this happens, an electromotive force is induced in the circuit, and as a consequence, an electrical current is induced in the circuit.

This phenomenon can be produced in different ways; for example:

1- By rotating a coil in a fixed magnetic field --> by rotating the coil, the magnetic flux through the circuit changes over time, so a current is induced in the circuit

2- By varying the intensity of the magnetic field over time --> this way, the magnetic flux through the circuit changes as well

Number #1 is used in electrical generators to produce electrical energy from mechanical energy (kinetic energy): in fact, a coil is made rotating (so, kinetic energy) in a magnetic field, producing an electrical current (electrical energy). It is clear that an essential element of this system is the presence of a magnet or a magnetic field, so D) is the correct answer.

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To make a given sound seem twice as loud, how should a musician change the intensity of the sound?
Serhud [2]

Answer:

C. Quadruple the intensity

Explanation:

The intensity of the sound is proportional to square of amplitude of the sound.

I ∝ A²

\frac{I_1}{A_1^2} = \frac{I_2}{A_2^2}\\\\I_2 = \frac{I_1A_2^2}{A_1^2}

When the given sound is twice loud as the initial value, then the new amplitude is twice the former.

A₂ = 2A₁

I_2 = \frac{I_1A_2^2}{A_1^2} \\\\I_2 = \frac{I_1(2A_1)^2}{A_1^2} \\\\I_2 = \frac{4I_1A_1^2}{A_1^2}\\\\ I_2 = 4I_1

Thus, to make a given sound seem twice as loud, the musician should Quadruple the intensity

3 0
3 years ago
A block of mass 10.0 kg is pulled to the right along a rough horizontal surface with a constant horizontal force of 20.0 N. The
Yakvenalex [24]

Answer:

the magnitude of acceleration will be 1.50m/s^2

Explanation:

To calculate your acceleration, you can use your formula that states that the net force on an object is equal to the mass of the object multiplied by the acceleration of the object. Fnet=ma

if you draw out this situation and label the forces you will have your vector towards the right with a magnitude of 20.0N and then your friction vector will be pointing to the left (in other words, in the negative direction) (opposing the direction of movement) with a magnitude of 5.00N, with the 10.0 kg box in the middle.

The net force will be calculated using F1+F2=Fnet where your F1=20.0N and F2= -5.00N (since it is towards the negative direction).

you will find that Fnet=15.0N

With that, plug in the values you know to calculate the acceleration of the block:

Fnet=ma

(15.0N)=(10.0kg)a    from her you can divide both sides by 10 to isolate a:

1.50=a  (and now make sure to label the units of your answer)

a=1.50m/s^2 (which is the typical unit for acceleration)

7 0
2 years ago
A force of 30 N is applied to an object with a mass of 15 kg. What is the resulting acceleration?
svet-max [94.6K]

Answer:

We know that Force = mass × acceleration

By substituting the values we get,

30 N = 15 kg × a (where a is acceleration)

Or we can write it as

15 kg × a = 30 N

Transposing 15 to RHS,

a = 30 ÷ 15 m/s²

Therefore, acceleration = 2 m/s²

pls give brainliest for the answer

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2 years ago
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What can radiation do to our cells if we are exposed to it too much?
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Answer:

it can kill you cell and win you kill you no cell no life

Explanation:

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1.6764 meters. You can also google inches to meters for your answer.

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