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Al P
Lv 7
Al P 發問於 Science & MathematicsPhysics · 1 十年前

Simple or hard thermodynamics?

What is the current effective BB thermal resistance of

air, and approximately how many d=100m ponderable

hydrophobic polystyrene balls (reflectivity=95%) do

I need to float on the ocean to lower the annual mean

surface temperature of earth by 1°C.

更新:

date:1/4/2011

更新 2:

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On the simple side:

Assume the atmosphere remains "transparent"

to Solar BB flux; water vapor and other feedback

mechanisms can be ignored. Feel free to play with

this.

更新 3:

**************************

1/6/2011

The simple answer is instructive with

regard to how things, even earth, MAYBE

thermostatically controlled theoretically.

In physics, I deal with approximations not

absolutes so doing some math seems reasonable

to me. Time for a poem from me.

Some sunny day I will show the sun its

Light or dark face in my small mirror

And the mighty star may humbly bow to me

But if you join me but ignore me

She may not humbly bow to us

更新 4:

Dedicated to the GW section;)

更新 5:

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MIT can't help the creator.

Lower case c.

更新 6:

@koshka

Thank you. I think you understand my

poets heart exactly.

Tutorial:

I think many in physics understand

Planck's law as applied to earth and

and sun. A large percentage of the

shorter wavelength, high energy, incoming

flux from the sun is absorbed by the earth's

surfaces including the ocean. These photons

are "transparent" to earth's atmosphere.

My ponderable inert low density polystyrene spheres

placed in key positions would send many of these high

energy photons back into space before they had

the chance (via absorption) of being converted

into Planck's IR earth spectrum. The composite atmosphere

resists such an outgoing spectrum; After the genie

is out of the bottle, the thermodynamics in the earth

system becomes very complex.

Many of the excellent contributors know where

I am going with this broad question, but they not

know that my real intent is to minimize "entropic"

debate, and maximize thinking out of the box;

Solutions, brick by brick via cooperation.

Nice feed

更新 7:

"Nice feed"? What the bleep!

Should have read: Nice feedback koshka

4 個解答

相關度
  • Koshka
    Lv 5
    1 十年前
    最愛解答

    Nice poem :)

    If you make enough huge floating islands with it (assuming that they are attached together) and given that it would not disrupt navigation. I guess that the area would be cooler because of the reflectivity (albedo) of white balls.

    My interpretation of your excellent charade in the added details, is that since a closed systems allows energy but not mass across its boundaries, our planet could be considered as such. Whith the exception of the occasional meteorite falling or space shuttles leaving and entering our atmosphere of course.

    So if the heat flows towards the white balls, they will not melt. But I would not know how to answer your question accurately. I hope some of your contacts have time to do so, it is worth it.

    You should definately post this same question in GW, a good deal of entropy (in all its definitions) is happening there =)

    __________________

    Oh and I am not chickening out this time, promised!!

    Actually I challenge anyone for the time the question still lasts!

  • ?
    Lv 4
    5 年前

    Thermodynamics applies to the random movement of debris in a closed approach. While mutations would possibly arise randomly, the system of organic evolution isn't random. It is mainly directed towards a specified target - accelerated abilities for survival. Therefore such bodily theories without difficulty do not follow.

  • 1 十年前

    watch the MIT Lectures on youtube

  • 1 十年前

    I haven' t the faintest idea and I got an "A" on thermodynamics at the university.

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