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France-L2-L2 Κατάλογοι Εταιρεία
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Εταιρικά Νέα :
- How much lux does the Sun emit? - Physics Stack Exchange
When you look 'at the world' (i e to the horizon) on a clear day, unlesss the sun is at a very low angle, the surface of your eye is not illuminated directly by the sun, only reflected sunlight from the atmosphere, ground and objects The 32,000-100,000 lux figure is referring to a horizontal surface illuminated directly by the sun
- How is distance between sun and earth calculated?
Another way of calculating the earth - sun distance is to look at the centrifugal and the gravitational force This solution assumes that one already knows the mass of the sun, but thats a different problem ;-)
- What is the simplest way to prove that Earth orbits the Sun?
If we assume the Sun orbits the Earth, the math says that the Sun should be much less massive than the Earth If we assume the Earth orbits the Sun, the opposite is true Either way we can get an estimate of the mass of the Sun We know from other tests that the Sun is more massive than the Earth, so therefore the Earth orbits the Sun
- What would happen if Jupiter collided with the Sun?
However, the Sun will accrete $\sim 10^{42}\ \mathrm{kg\ m^2\ s^{-1}}$ of angular momentum, which is comparable to its current angular momentum The accretion of Jupiter in this way is therefore sufficient to increase the angular momentum of the Sun by a significant amount In the long term this will have a drastic effect on the magnetic
- sun - Nuclear fusion - Hydrogen isotopes - Physics Stack Exchange
The main fusion reaction in the sun is the proton-proton chain reaction, which takes six protons and produces two protons, one alpha particle, two anti-electrons, and two electron neutrinos The deuterium nucleus is only barely bound and can be destroyed — dissociated into a proton and neutron — by absorbing a gamma ray with energy more
- Why does the Sun appear larger during the sunrise and sunset?
The moon or the sun on the other hand do not appear noticeably smaller, because their real distance does not change much when they move to the horizon But the brain would expect them to be smaller, much as the clouds, or a plane, and hence perceives them as larger than they 'should be'
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- What is actually meant by sun set and sun rise times, when taking . . .
The Sun has actually set risen and we see it due to the way light is bent across the atmosphere Apparently due to coincidence of the size and distance of the sun, its exactly the same size - so if we see 50% of the sun, the sun is 50% below the horizon So, I understand all this, so here is my question :
- thermodynamics - Black and white matters. But why and how? - Physics . . .
The visible has about half of the energy coming from the sun on the surface, as seen in the link So a metal door in the sun will transfer the heat of the visible spectrum to the interior if painted black, will reflect it back and keep the interior cooler if painted white It is a good reason for painting roofs and walls white in hot countries
- Why dont spaceships get hotter and hotter until they burn up since . . .
However, also consider that the side facing the Sun is all that gets heated The other side gets very cold because it can radiate a ton of heat without input (at least until the ship turns) This sort of passive radiation also helps keep ships cool, but the temperature difference between the hot cold sides can become an issue if not adequately
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