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2 years ago

What is the science principle that explains magnetic fields? I need this fast, please!

Physics

1 answer:

bekas [8.4K]2 years ago

3 0

Answer:

I literally just learned this last week and if I remember correctly it is Faraday's Law of Induction.

Explanation: Hope this helps also I hope you have/had an amazing day today<3

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when the armature of an ac generatr rotates at 15.0 rad/s, the amplitude of the induced emf is 27.0 V. What is the amplitude of

nata0808 [166]

To solve this problem we will apply the concepts related to the electric field. This is defined as the product between the angular frequency, the number of turns of the body (solenoid in this case) the magnetic field and the sine of the angular frequency and time. Mathematically this can be described as

$E = \omega NBA |sin \omega t|$

Here,

$\omega$ = Angular frequency

N = Number of turns

B = Magnetic field

The emf has its maximum value when $sin \omega t = \pm 1$

Thus the amplitude of the emf is

$E = \omega NBA$

When number of turns of armature, area and applied magnetic field remains constant, induced emf is proportional to angular speed.

$E \propto \omega$

Further it can be written as follows,

$\frac{E_1}{E_2} \propto \frac{\omega_1}{\omega_2}$

$E_2 = \frac{\omega_2}{\omega_1}E_1$

$E_2 = \frac{10rad/s}{15rad/s}(27.0V)$

$E_2 = 18V$

Therefore the maximum amplitude of induced emf when armature rotates at 10.0rad/s is 18V

5 0

3 years ago

If a rocket transfers 2,500,000 MJ of energy when it takes off, how much work is done?

erastovalidia [21]

Answer:

2,500,000 MJ ( $2.5\cdot 10^6 J$ )

Explanation:

According to the work-energy theorem:

The work done on an object is equal to the amount of energy transferred

In this problem, the energy transferred by the rocket is

$E=2,500,000 MJ=2.5\cdot 10^6 J$

Therefore, the work done must be equal to the energy transferred, therefore:

$W=E=2.5\cdot 10^6 J$

6 0

3 years ago

Clara rushes 30m to a truck then turns and walks back. Total travel is 120s what is her average velocity?

navik [9.2K]

Taking into account the definition of velocity, Clara's average velocity is 0.5 m/s.

<h3>Definition of velocity</h3>

Velocity is a physical magnitude that relates the displacement of an object, the time it takes to make this change in position and direction. So it is considered a vector magnitude.

In other words, the velocity can be defined as the amount of space traveled per unit of time with which a body moves, considering the direction, and can be calculated using the expression:

velocity= distance traveled÷ time

<h3>Average velocity of Clara</h3>

Clara rushes 30 m to a truck then turns and walks back. Total travel is 120s. Then, you know:

distance traveled= 30m rushing + 30m walking back= 60 m
time= 120 s

Replacing in the definition of velocity:

velocity= 60 m÷ 120 s

Solving:

<u><em>velocity= 0.5 m/s</em></u>

Finally, Clara's average velocity is 0.5 m/s.

Learn more about velocity:

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#SPJ1

5 0

2 years ago

Which of the following is not a sedimentary structure?A) Magma emplacementB) Mud cracksC) Ripple marksD) Cross beds

lawyer [7]

Answer:

A) Magma emplacement

Explanation:

Sedimentary structures forms during deposition of sediments. It can also form after sediments have been deposited. Sedimentary structures can only be found in sedimentary rocks. Some examples include mud cracks, ripple marks, cross stratification, potholes, etc

Magma emplacement is an igneous process which describes the different mechanisms by which magma can be emplaced. It is only typical of igneous rocks.

6 0

3 years ago

How to cure bor-edom????

Allisa [31]

Answer:

keep ur self busy

Explanation:

read a book

catch up on homework

get ahead of the class

watch tv

go outside

4 0

3 years ago

Read 2 more answers