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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
  • 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
  • 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 ;-)
  • visible light - Is sunlight truly white? - Physics Stack Exchange
    In fact, helium was first discovered by astronomers observing the sun's corona during a solar eclipse The low pressure helium in the corona emitted the helium emission spectrum that was observed unaltered on earth Meanwhile, the high-pressure helium in the body of the sun was emitting the usual continuous spectrum
  • How does heat pass through glass? - Physics Stack Exchange
    $\begingroup$ Let's say the glass is receiving heat from a heat source such as the sun Won't a fraction of the radiation pass through the glass and act directly on the air to warm it up? $\endgroup$ – Greg Harrington
  • 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 :
  • 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 does the Suns gravity affect our weight?
    The logic of the answer seems wrong to me as well It's describing exactly the situation present in tidal forces, but it's coming coming to the wrong conclusion; it is well known that the tidal force pulls you away from the center of the Earth at the point directly underneath 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





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