Recent content by Ralph Spencer

A relative of mine passed away recently because of brain haemorrhage. We are now investigating how well the hospital handled the situation after learning that the hospital didn't do it very well from another hospital where they were shifted shortly before their last breath. Here's the second...

So it should correspond to some initial force applied on what was available back then at the beginning of time?

While reading through Halliday & Resnick, I came across a brief introduction to General Relativity in the gravity chapter. It gives the example of two boats starting off on the equator heading towards the south pole in parallel paths. However, they MEET at the south pole. While sailors can...

One of our senior teachers talked about infinity and said that 1∞ is not defined. On deeper probing, he said that it is a bit higher mathematics and it wouldn't be appropriate to go deeper here. Naturally, I could think of a inductive proof that it should be 1, if ∞ ∊ N. I can't think of a...

Thanks for quick answer. That quite answers the question. I would still certainly appreciate an answer to my first question in the last post about the uniform filings. I don't have much mathematical background in the subject; the main drawback. I just gave it a thought after you talked about...

I understand permeability as the property of substances that describes their ability to allow formation of magnet fields in and around them. Lets clear up things from the basics: If I were to lay perfectly uniform iron filings(uniform in everything: size, mass, composition) in unit area, with...

Negative, sir! That's the point of my question. You're considering only one line. If you check the "theoretically next" line (which is just one theoretical point, infinitely small distance) away from the initial line, the direction will be same. If you plot this, with the darkness of the line...

Moreover, to map a field line, we use a compass needle. Since the needle is AT THAT POINT is why it shows that direction. If it were to be placed, say at one nanometer from that point the field would be in the same direction. Only thing that would drop a bit is the intensity, which is reducing...

My (high school, gah!) textbook gives an experiment: I take a straight current carrying conductor, a cardboard sheet is placed perpendicular to the conductor, so that the conductor passes straight through the sheet, remains perpendicular. Then I use a salt sprinkler to sprinkle iron filings on...

If I misinterpreted what http://www.nature.com/nature/journal/v406/n6793/full/406277a0.html" experiment meant, could you please explain it? Relativity postulates that speed of light is same for all observers. How can speed of light change?

I would like to have a basic idea of the concept. What would be the error graph when approximate data is extrapolated to such large values? Maybe I'm thinking far ahead of my current knowledge (which I would rate as beginner), however, if the newly created matter is not accounted in this...

I recently read http://www.google.co.in/search?source=ig&hl=en&rlz=&=&q=speed+of+light+in+caesium+vapors&btnG=Google+Search" that speed of light is faster in cesium vapors. It is described as leaving the cesium container even before it has entered it, claims that light travels 310 times faster...

https://www.physicsforums.com/showthread.php?t=397828 < My own research in the past.

While observing the Sun, which is 8 light-minutes 12 light-seconds away from us. We (by visible and invisible spectrum of the electromagnetic radiation) observe its state 8.20 minutes ago. Special relativity forbids any information to travel at speeds greater than that of light. This should...

Why so? It should be total energy divided by c²? I don't understand where the difference of energy comes from.