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ser-zykov [4K]
2 years ago
7

In Photoshop what tool can you use to cut out the background around the head?

Physics
2 answers:
Anika [276]2 years ago
7 0
Answer C
Because you need to crop out the background
Nataly_w [17]2 years ago
5 0

Answer:

D.

Explanation:

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A 5.00-pf parallel-plate air-filled capacitor with circular plates is to be used in a circuit in which it will be subjected to p
r-ruslan [8.4K]

A 5 <em>pF</em> parallel-plate air-filled capacitor, with a potential difference equal to 100 Volts and an electric field of 10.000 Volts per meter, must have a plate separation of 10 milimeters, and plate's area equal to 0.0056 meters squared.

<h3>Further explanation</h3>

Capacitors are electrical components use to store electrical energy in the form of potential difference. This is done by putting 2 plates of a conductive material very close to each other, but without getting them into contact. The idea is that, when you charge one plate with (for example) positive charges, the other plate will "feel" this and will charge itself with negative charges (due to the attraction between charges of opposite signs).

The trick is that, even though the charges in the two plates attract each other, they can't come into contact since the 2 plates are separated by a certain distance. Now let's suppose there is only air between the capacitor's plates, we know that air is not a conductive material, however if you charge both plates just enough, you'll be able to make air conduct electricity and so charges from one plate will go to the other and equilibrium will be achieved.

This is the same thing that happens when a lightning strikes the ground. Imagine that the Earth is a gigantic capacitor, with the clouds being one plate and the ground being the other plate. When the clouds are charged enough, air is forced to conduct electricity towards the ground (which is the lightning we see), until equilibrium is achieved. This is the reason why, in Physics, we say that everything is a conductive material if you force it just enough.

Back to our problem... We can compute the separation of the capacitor's plates with the following equation:

V = E\cdot d

Which says that the Voltage <em>V</em> is equal to the product of the Electric field <em>E</em> and the distance between the plates <em>d</em>. This equation is valid if the electric field across the capacitor is constant (which for small magnitudes of <em>d</em> it is). So solving for the distance we get:

d= \frac{V}{E} = \frac{100}{10000} \frac{V}{V/m} = 0.01 m = 10 mm

Where we can see that the separation of plates is 10 millimeters. Now for the area between the plates we can use this other formula:

C= \frac{\epsilon \cdot A}{d}

Where \epsilon is the air's permittivity which has a value of around 8.86 \cdot 10^{-12} \frac{F}{m}. By solving for the plate's area, we can find:

A= \frac{C \cdot d}{\epsilon} = 0.0056 m^2 =

Which corresponds to a plate's radius of 42.4 millimeters.

<h3>Learn more</h3>
  • What is electricity: brainly.com/question/9194793
  • Relation between elementary particles and charge: brainly.com/question/12502147
  • Another capacitor problem: brainly.com/question/3203280
<h3>Keywords</h3>

Capacitor, Electric charge, Electric field, Voltage

4 0
3 years ago
Read 2 more answers
2. is a variable that gives location relative to an origi
xeze [42]
Where is the rest of the sentence?
4 0
3 years ago
During a neighborhood baseball game in a vacant lot, a particularly wild hit sends a 0.148 kg baseball crashing through the pane
mr_godi [17]

Explanation:

Mass of baseball, m = 0.148 kg

Initial speed of the ball, u = 14.5 m/s

Final speed of the ball, v = 11.5 m/s

After crashing through the pane of a second-floor window, the ball shatters the glass as it passes through, and leaves the window at 11.5 m/s with no change of direction. So, the direction of the impulse that the glass imparts to the baseball is in opposite direction to the direction of the balls path.

The change in momentum of the ball is called impulse. It is given by :

J=m(v-u)\\\\J=0.148\times (11.5-14.5) \\\\J=-0.444\ kg-m/s\\\\|J|=0.444\ kg-m/s

Hence, this is the required solution.

3 0
3 years ago
Is sunlight and beat abiotic or biotic?
n200080 [17]
The sun is abiotic-Brainly.com
8 0
2 years ago
Two loudspeakers emit identical sound waves along the x-axis. The sound at a point on the axis has maximum intensity when the sp
EleoNora [17]

The concept required to solve this problem is related to the wavelength.

The wavelength can be defined as the distance between two positive crests of a wave.

The waves are in phase, then the first distance is

\Delta x_1 = 20cm

And out of the phase when

\Delta x_2 = 30cm

Thus the wavelength is

\Delta x_2-\Delta x_1 = \frac{\lambda}{2}

Here,

\lambda =  Wavelength

If we rearrange the equation to find it, we will have

\lambda = 2 (\Delta x_2-\Delta x_1 )

\lambda= 2(30-20)

\lambda = 20cm

Therefore the wavelength of the sound is 20cm.

5 0
3 years ago
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