Recent content by Privalov

There is a space station of the length L and uniformly distributed mass M on the low Earth orbit. One side of it always faces the Sun. Which tension will the structure experience? My attempt of the solution: bottom of the station is L/2 meters below the stable orbit at that velocity...

My mistake. The right answer is choice A then. Ring radius 2.4 m distance from center to halt point 5 m distance from ring to halt point 5.5 m q (charge at center) 3.50E-07 C Q (charge at ring) -7.10E-07 C Electron charge -1.60E-19 C Electron mass 9.11E-31 kg Vacuum...

By q1q2 do you mean q*qe ?

I have got 1.58*107, what is somewhat similar to first choice. Your formulas look reasonable. My calculations are: Ring radius 2.4 m distance from center to halt point 5 m distance from ring to halt point 5.5 m q (charge at center) -7.10E-07 C Q (charge at ring) 3.50E-07 C...

Me too. Maximum number of game iterations is 2*n-2, correct? So, complexity is O(n).

I assume |S| in your formula is total weight of selected balls, not the count of selected balls, correct?

Let’s take n=6 for example. Am I allowed to make O(n log(n)) = 4.66 turns in the game? Should I round it up to 4 or 5? Again, let’s take n=6 for example. If the subsets are always of size 1, game will have 6 iterations If the subsets are always of size n, game will have 5 iterations Both...

No. Wikipedia says: "Since photons contribute to the stress-energy tensor, they exert a gravitational attraction on other objects" http://en.wikipedia.org/wiki/Photon Photon has a miniscule gravitational potential, which can be ignored at most cases (but not in this particular problem).

You derived the resolution of this paradox yourself – the missing energy goes to the gravitational potential energy of the photons. As particles move apart, against the force of each other’s gravity, their frequency and their energy decrease. At the same time, their gravitational potential...

It’s not really possible, since gravitational attraction of two neutrons is too small – they will run away to infinity. However, let’s assume we use smaller portion of energy, that 1 Joule. It will not be possible. Photons will lose small fraction of their energy – what will make it not...

The full quote says: "Newtonian theory of gravity, which said that objects attracted each other with a force that depended on the distance between them. This meant that if one moved one of the objects, the force on the other one would change instantaneously. Or in other gravitational effects...

Yes; and energy in magnetic field of a typical wire at any given moment is also insignificant. However, any attempt to drain the energy from this magnetic field will result in more energy supplied by the power plant. So, total amount of energy, transferred by wire, can become significant...

Energy in electric field is the potential energy of separated charges. It can change, if the distance between charges changes. In principle, it could have changed in the given problem (it did not though). Energy in magnetic field is the kinetic energy of moving charges. In this paradox, speed...

Hi M.Starkov! Nice to see you here as well. Your English is not bad. And especially high achievement is you somehow managed DaleSpam to read your posts. I was not able to do that yet. Perhaps I'm too cranky. Unless you, M.Starkov, will start using Minkowski diagram, as I advised you long...

You can think about it as a boost and multiple rotations. Is it possible the equations you have derived are the electromagnetic representation of the same paradox? You came up with the same “margin of error”, as I did.