[Archive!] Pure mathematics, physics, chemistry, etc.: brain-training problems not related to trade in any way - page 422
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The next challenge will be more difficult :) In the evening.
I hope the task will be a little easier than understanding how the market works
ZS: Maybe someone will create a topic on how forex works? Maybe some bright ideas will slip in.
A puzzle to solve:
.
Which is greater: The amount of energy that the Earth received from the Sun over a period of 1000 years or the amount of energy that the Earth gave off by radiation into space, over the same period of time? Or are these amounts of energy equal?
PS: The problem only seems simple.
Apart from the reflected and over-radiated energy from the Sun, there is space:
- geothermal energy
- heat that is released in the process of the surface friction against the atmosphere, which dissipates the kinetic energy of the Earth's rotation around its axis
- heat that is released by water masses rubbing against the bottom of the oceans - dissipation of the rotational energy of the Earth, and the rotational energy of the Moon around the Earth
- ... and a bunch of other smaller factors, but also factors.
The quantities of energies are not exactly equal of course, but they differ by a negligible fraction. Otherwise the Earth would have cooled or warmed dramatically over those 1000 years. And this, judging from history, is not the case.
Try to estimate what fraction (%) of the Earth's area is affected by direct sunlight. Do not take into account "flattening of the Earth", eclipses and refraction of rays in the atmosphere.