# Recent content by Almanzo

1. ### Work required to assemble charged particles

I take it that the charges come from infinity. The work required to bring them in from infinity is the sum of the electrostatic energies of the pairs of charges. With 8 charges there are 8*7/2 = 28 such pairs. These can be viewed as the 12 sides of the cube, its 12 surface diagonals and its 4...
2. ### Time Dilation/Proper Time Question

The twin paradox involves a set of twins, or rather a set of two watches set to an equal time and traveling at different velocities. After some interval they are supposed to read different times. Now the time measured by a watch is its proper time, whatever route it has traveled; there is no...
3. ### How much curvature are we talking about?

I am unsure about the source of the confusion. There are three things to be considered: 1. To calculate the time needed to fall from a certain height in Earth gravity. 2. To calculate the length of a line segment in spacetime. 3. To calculate the radius of a circle, if a chord and...
4. ### Quantum Physics and the Pensions Crisis

I have sometimes feared that, by a chain of events which steadily become more improbable, I would live forever, though in steadily declining health. Think about it. To observe oneself as being alive, one doesn't need much of one's faculties. The idea is nightmarish enough to keep one awake at...
5. ### Electron 'orbits' question

This is a question to which different people will give different answers. For example, the theory of Bohm would imply that the electron does trace a kind of orbit, but a very intricate one, which isn't at all like a circle or an ellipse. The Many Worlds theory would have the electron trace...
6. ### How much curvature are we talking about?

In space, a circle touching the bullet's track on the inside would have a much larger radius (hence less curvature) than a circle touching the ball's track on the inside. However, the problem is to be solved in spacetime. Now, the bullet takes less time to complete its track than the ball (which...
7. ### Prime Numbers

Prime numbers have exactly two (positive integer) divisors: 1, and the number itself. after all, N = 1 * N, and N = N * 1. As far as I know, some patterns have been found which generate only prime numbers, but no pattern has been found which generates all of them. In general, to see if some...
8. ### Infinite Of Infinates, whats the solution?

Infinite expressions, like 1 + 1/2 + 1/4 + 1/8 + ... , may or may not refer to existing mathemathical objects. If one wants to reason about such an object, one must first ascertain its existence. (For a finite expression, such as 3 * 1/5; the existence of the object is usually "prewired" in the...
9. ### Nostradamus and the LHC

Multi-quote still doesn't work. I did not think of asteroid impacts, but of nuclear bombs. Perhaps I should translate: Fire which is sleeping in the abyss of matter, Will be unchained by the ingenuity of ONE STONE Devastation to an entire city Great kingdoms turned into cemeteries...
10. ### Nice way to find the integral

Oh, yes. Gn(0) = (-1/n)*(6/n3)*e0=(-6/n4). Not zero at all. But Gn(x) does tend to zero if x increases without bound. So, the integral of gn(x) from 0 to infinity would be (+6/n4). Strangely, because someone had earlier suggested zero as the answer, I accepted a result of zero without...
11. ### Nostradamus and the LHC

The problem with "supernatural" claims, such as prognostication, is that there is so much fraud going around. And the problem with Nostradamus, specifically, is that his quatrains are so unclear. Thus he opens himself to the suspicion of fraud. A fraudster would be unclear on purpose, in order...
12. ### Nice way to find the integral

Last night, I have thought about it some more. x3/(ex-1) = (x3/ex)*1/(1-e-x) x3/(ex-1) = (x3/ex)*(1 + e-x + e-2x + e-3x + e-4x + ...) x3/(ex-1) = x3 * (e-x + e-2x + e-3x + e-4x + ...) Let Gn(x) = (-1/n)*(x3 + 3x2/n + 6x/n2 + 6/n3)*e-nx gn(x) = dGn(x)/dx = (x3 + 3x2/n + 6x/n2 +6/n3)*e-nx...
13. ### Nice way to find the integral

This is an improper integral, because the integrand x3/(ex-1) is not defined at the edge of the integration domain, x=0. e0 - 1 = 1 - 1 = 0. 03/0 = 0/0 is undefined. So one must first ascertain whether it converges. To find a primitive function, one might substitute ex = u, or x = elog(u)...
14. ### Nostradamus and the LHC

I continue wondering why Nortradamus would urge the inhabitants of Geneva to flee from their city, if they cannot also flee from their planet. In an earlier post I suggested that the initial black holes, spraying from the installation, might already be harmful to human beings, in spite of their...
15. ### A mass sliding down an incline plane with a pulley attached

I think it might be well to define what you mean by T, w, N, x, and so on, because that would make the problem easier to understand. The way I understand it, there is an inclined plane, and theta is the angle between the plane and the horizontal. Mass m1 is lying on the plane, while mass mass...