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Are there areas in the observable universe which surely cannot contain galaxies with planets that can support life as we know them?
Is it plausible to desire a "universal" calendar applicable everywhere in our universe? Must calendars be based on solar systems (Must calendars be "relational")? It might be that the universe "...
I was looking for book on classical thermodynamics. I found lot of related posts in PSE but couldn't find a book which type I was expecting. I was searching for book which covers the whole thermody...
In short, momentum is vector and kinetic energy is scalar. $$\vec p = m \vec v \tag{1}$$ $$T = \frac{1}{2}m \vec v^2=\frac{\vec p }{2m} \tag{2}$$ Two momenta in opposite direction is $0$. Total ...
How can I turn this floor lamp into a reading light? I want all light exiting upwards from the lamp shade to point down. Do I just buy a mirror and put it on top of the lamp shade? Then the mirror...
I don't understand either of these Reddit comments that are still too complicated. Please simplify? Alfenhose An interesting phenomena, it is because the brain doesn't store what you saw during ...
Decibel level listed of solfege. Do Re Mi Fa So La Ti Do 24 27 30 32 36 40 45 80 I saw that whispering decibel level is around 40. And, normal voice level is ...
Is this advice correct? Are they alluding to Freezing Point Depression? Adding salt to tap water lowers the Crystalloid's freezing point. Pour 3 tbsp (51 g) of salt into each of your 3 plast...
If planet 9 exists, is it correct to say that it is a "dark planet"? By "dark" here I mean to a planet that doesn't reflect enough light to easily be seen from normal telescopes (in the current co...
I am led to understand that a proposed frequency auction by the Federal Communications Commission[1] has been criticized because part of the spectrum is used to gather data on weather systems. How...
Suppose you have a wooden board lying horizontal, with grain along the long axis as is the case with normal boards. There is a wooden dowel embedded into the board, as is the case with common dowe...
There isn't a definitive answer on the upper bound of quantum computing's processing abilities, but here's what we know: Classical Computers vs. Quantum Computers: Regular computers: Their proc...
Suppose we have a free falling object inside a planet's gravitational field with strength g.The planet's atmosphere provides a drag force which is dependant from the u^2 of the particle. Suppose t...
Since these two methods are shared, I've got what I want, And no coming discussions. So this is the last response of these discussion. If your intentions were good and were offended by me, pleas...
Since these two methods are shared, I've got what I want, And no coming discussions. So this is the last response of these discussion. If your intentions were good and were offended by me, pleas...
Lagrangian is no energy. It’s just the Lagrangian. It's perhaps more fundamental than energy in a certain sense. In general, you can think of it as a function that minimizes the action. That's the...
My optometrist said that round eyeglass lenses are OPTICALLY better than rectangular, particularly to correct myopia. He was NOT referring to fashion or style. I couldn't understand his explanatio...
I never grokked the optics behind LightHouses and the WW2 poster below work. LightHouse beams are narrow and focussed. Doubtless, the light source can fail to illumine a seafarer or the enemy subm...
With Maxwell's equations being linear and superposition working, isn't there no mechanism (in free space) for photons to interact? (Well, there's gravity: https://en.wikipedia.org/wiki/Geon_(physic...
Two weeks ago, my carry on worked perfectly. But last week the detachable wheels stopped rotating smoothly, when I tried to glide my carry on. The wheels budge JUST A TAD when you push them hard, b...
I stumbled these pictures on Quora, and I'm assuming they were real. Wouldn't the supporter (person whom gun is mounted on) suffer hearing loss? Wouldn't the barrel burn his ear? I'm assu...
Hello All. New member here. I would like to preface this post with the fact that I'm not a physicist, nor formally educated in physics. I am a carpenter, albeit one with a high IQ( 149/154 tested)....
Part 1 Say we have a round water pool, the radius is 10m, and the water depth is 2m. C is a fixed point: Fixed on the surface of water. Fixed at the center of the pool. F1 is stable forc...
Say we have a four underwater components tidal power / hydro power system. Component A. A propeller would always orient along the same direction regardless the direction of the flow. This is th...
Please see below screenshot of 15:59.The LED spot light (fastened to the front of the boat) illumines merely a few meters in front, and fails to illumine most of the water between the boat and the...
