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poizon [28]
3 years ago
10

A 3.0 pF capacitor consists of two parallel plates that have surface charge densities of 1.0 nC/mm2 . If the potential between t

he plates is 27.0 kV, find the surface area of one of the plates.
Physics
1 answer:
Archy [21]3 years ago
8 0

Answer:

A=81mm^2

Explanation:

We know that for a capacitor Q=CV, where <em>Q </em>is the charge of one plate, <em>C</em> the capacitance and <em>V</em> the potential between the plates.

We also know that Q=\sigma A, since \sigma is the surface charge density and <em>A</em> the area of the plate (both equal in our case).

Putting all together:

A=\frac{CV}{\sigma}

Which for our values is:

A=\frac{(3\times10^{-12}F)(27\times10^3V)}{1\times10^{-9}C/mm^2}=81mm^2

Where we notice that the S.I. units combination FV/C must not have units (we can verify it directly from their definitions or we notice that mm^2 is enough to describe an area).

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nataly862011 [7]

Answer:

1.2ms⁻²

Explanation:

F = ma

12 = 10*a

12/10 = a

6/5 ms⁻² = a   or 1.2 ms⁻² = a

6 0
3 years ago
Which of the following changes would make a heat engine less efficient
DIA [1.3K]
A heat engine would be less efficient due to many factors 
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A heat engine could be less efficient because of friction
Hope it helps I am a beginner
8 0
4 years ago
Why the efficiency of carnot engine is not 100%
SVEN [57.7K]

Well, actually a heat engine using the Carnot cycle whose cold reservoir is maintained at 0 K could in principle be 100% efficient, even if the hot reservoir was merely at the ambient temperature. Since it costs no energy at all to maintain a heat reservoir at the ambient temperature as long as you have a perfect thermal connection to a large thermal capacitor like your swimming pool or a nearby aquifer you’d have built a perpetual motion machine.

3 0
3 years ago
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LiRa [457]
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6 0
3 years ago
3. A 6 kg block moving to the right at 4 m/s collides with and sticks to a stationary block of unknown mass. If the two blocks m
Sphinxa [80]

Answer: 2kg

Explanation:

This problem is a textbook conservation of momentum problem. The intial momentum is equal to the final momentum. For the initial state of each block, only the first one was moving. Then they both combine to move together.

Pi = Pf

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(6kg)*(4m/s) = (6kg+xkg)(3m/s)

Let x equal the unknown mass of block 2

24 = 18 + 3x

6 = 3x

x = 2kg

6 0
3 years ago
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