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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
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
optics - If the sea surface were absolutely calm should the Sun . . . As the elevation of the Sun decreases and it moves from the zenith to the horizon, the glitter becomes more and more elliptical, until it becomes a ribbon as in your image On the other hand, if the water were completely still, with a smooth and horizontal surface, then the sun glitter ribbon would be gone, and you would just see a direct
Nuclear fission in the Sun - Physics Stack Exchange It is estimated that a very small fraction of mass of the Sun (~ $10^{-12}$ times the abundance of hydrogen) is uranium (both 235 and 238 isotopes) But given the huge mass of the sun (~ $2*10^{30}$ kg), the mass of uranium in sun will come to around $2*10^{18}$ kg, which is again a significant quantity
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
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 doesnt sun go all the way to the horizon during sunset? However, there may be an illusion where sun's position at horizon may appear slightly different than it actually is due to atmospheric refraction It may be useful to read this Also, in the second image, there appars to be layer of clouds under the sun, maybe the sun is disappearing behind those while still remaining above horizon, i e not
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 ;-)
How much iron would I have to shoot into the Sun to blow it up? The sun's temperature at the surface is ~5778 Kelvin which is much higher than the boiling point of Fe, Ni, or any alloy of the Fe-Ni The atoms would disperse and would become lost in the sea of H and He nuclei, and wouldn't conceivably come anywhere near the core in one piece Literally nothing about the sun would change in this scenario
How hot can metal get in sunlight? - Physics Stack Exchange If the building is located in Hammerfest, Norway the metal might get warm to the touch If it's on the sun-facing side in Las Vegas you may find it gets hot enough to cause burns A definitive answer is not possible If people can touch it easily the temperature is a concern If it's out of reach, don't worry about it The iron isn't going to melt