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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
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
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
astrophysics - Can Jupiter be ignited? - Physics Stack Exchange It's fusing hydrogen into helium And it does this because it has so much mass that gravity is trying to collapse the star but the immense pressure means fusion takes place (creating an outward pressure to counteract the gravity pulling inwards creating a balance which must be maintained to keep the sun from collapsing inwards or exploding
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
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
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 ;-)
temperature - How does water evaporate if it doesnt boil? - Physics . . . When the sun is out after a rain, I can see what appears to be steam rising off a wooden bridge nearby I'm pretty sure this is water turning into a gas However, I thought water had to reach 100 degrees C to be able to turn into a gas Is there an edge case, for small amounts of water perhaps, that allows it to evaporate?
How to get 3D coordinates (XYZ) of the sun given Azimuth and altitude . . . I want to create an Augmented Reality(AR) application to show the sun's position where I need the 3D(XYZ) coordinates to plot in Augmented Reality(AR) Main question: I need to calculate the 3D coordinates(XYZ) from the sun Azimuth and altitude elevation Look at the image
Why does the Sun always rise in the East? - Physics Stack Exchange At noon, the Sun is above the observer, and east points backward, against the orbital motion At sunset, east points away of the Sun, because the planet made a half-revolution with respect to Sun and the observer is now near the centre of the trailing Earth hemisphere (lower side of the blue disk)