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nirvana33 [79]
2 years ago
14

Air undergoes dielectric breakdown at a field strength of 3 MV/m. Could you store energy in an electric field in air with the sa

me energy density as gasoline? The energy content of gasoline 44* 10^6 J/kg and the density of gasoline is 670 kg/m^3. Yes or No.
Physics
1 answer:
slega [8]2 years ago
3 0

Answer:

No

Explanation:

The energy content of gasoline is

44\cdot  10^6 J/kg

while the density is

670 kg/m^3

So the energy density of gasoline is

u = (44\cdot 10^6 J/kg)(670 kg/m^3)=2.95\cdot 10^{10} J/m^3

The energy density of an electric field is given by

u_E = \frac{1}{2}\epsilon_0 E^2

where

\epsilon_0 = 8.85\cdot 10^{-12} F/m is the vacuum permittivity

E is the strength of the electric field

For air at dielectric breakdown,

E=3 MV/m = 3\cdot 10^6 V/m

Substituting into the equation,

u_E = \frac{1}{2}(8.85\cdot 10^{-12})(3\cdot 10^6)^2=39.8 J/m^3

We see that u_E < u, so the energy density of the electric field is much lower than the energy content of gasoline, so the answer is No.

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geniusboy [140]
Blue light will bend more than the others because it has a slightly greater refractive index. This is because blue light has a shorter wavelength and more energy, meaning it has to slow down more than the others when it hits the water.
5 0
2 years ago
Suppose of methane are burned in air at a pressure of exactly and a temperature of . Calculate the volume of carbon dioxide gas
Licemer1 [7]

There are supposed to be numbers in these places:

" _____ of methane"

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I've seen a lot of questions with missing numbers before, but I think this is the first time I ever saw a question where even the number of significant digits to round the answer to is missing.

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4 0
3 years ago
Which of the following would decrease in size during the contraction of a sarcomere? The width of the I-bands The width of the A
ANEK [815]

Hi!


The correct answer would be: the width of I-bands


The sacromere is the smallest contractile unit of striated muscles. These units comprise of filaments (fibrous proteins) that, upon muscle contraction or relaxation, slide past each other. The sacromere consists of thick filaments (myosin) and thin filaments (actin).


<em>Refer to the attached picture to clearly see the structure of a sacromere.</em>


<u>When a sacromere contracts, a series of changes take place which include:</u>

<em>- Shortening of I band, and consequently the H zone</em>

<em>- The A line remains unchanged</em>

<em>- Z lines come closer to each other (and this is due to the shortening of the I bands) </em>

The only changes that take place occur in the zones/areas in the sacromere (as mentioned), not in the filaments (actin and myosin) that make the up the sacromere; hence all other options are wrong.


Hope this helps!

8 0
3 years ago
A powerful searchlight shines on a man. The man's cross-sectional area is 0.500m2 perpendicular to the light beam, and the inten
babymother [125]

Answer:

The magnitude of the force the light beam exerts on the man is 5.9 x 10⁻⁵N

(b) the force the light beam exerts is much too small to be felt by the man.

Explanation:

Given;

cross-sectional area of the man, A = 0.500m²

intensity of light, I = 35.5kW/m²

If all the incident light were absorbed, the pressure of the incident light on the man can be calculated as follows;

P = I/c

where;

P is the pressure of the incident light

I is the intensity of the incident light

c is the speed of light

P = \frac{I}{c} =\frac{35500}{3*10^8} = 1.18*10^{-4} \ N/m^2

F = PA

where;

F is the force of the incident light on the man

P is the pressure of the incident light on the man

A is the cross-sectional area of the man

F = 1.18 x 10⁻⁴ x 0.5 = 5.9 x 10⁻⁵ N

The magnitude of the force the light beam exerts on the man is 5.9 x 10⁻⁵ N

Therefore, the force the light beam exerts is much too small to be felt by the man.

8 0
3 years ago
Can anyone answer this fast pls
nekit [7.7K]
I believe the answer would be 4.5. because it wouldnt be c or d. and 2 seems too small.
3 0
3 years ago
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