Recent content by ande4jo

I agree that a passive antenna cannot create energy and also agree that on the transmit end focusing the energy is what is meant by gain in the antenna (due to shaping the signal in the near field). My thought is on the receive side whereby it is not able to focus the signal that is in the far...

I expect that others have already asked and answers this question but I could not find it with Google searches. My thought of this apparent antenna reciprocity violation is per below. Since antenna reciprocity states that an antenna will have same characteristics whether used a transmit...

Thanks for the quick reply. As for the broken glass example of reassembly (and as I understand it), the reason that it is so very unlikely is that the huge number of particles involved make the possibility tend to zero, but any individual atom or molecule of the original glass can go back to...

My question is on the assumption that there is nothing in laws of nature that says if gravity had time reversal then nothing would appear odd. The example professor Feynman gave was a system with objects rotating due to gravitational attraction that rotated in a clockwise manner with normal...

I would expect that it would increase the mass because the energy would increase due to photon energy equal to h x f being added to the system. Molecular mass would always have objects rotating inside the molecule even before the photon gets absorbed since molecules are made up atoms that have...

Thanks

Still, at the heart of calulus, if I understand it correctly, is the fact that we take a number infinitely small but not zero and assume that if the limit exists as we approach the limit from both the high side and low side, then the limit must exist at all points (including zero). Because we...

I guess I struggle with an infinity being reached as that seems like a contradiction. By definition i expect that an infinity cannot be reached. Also I am intrigued by that fact that calculus has at its roots a "quantum" nature (since it is a limit of a ratio's denominator that is infinitesimal...

As I understand it (coming only from an engineering background), light (including all radio frequencies outside of our visible spectrum) come in discreet chunks called photos from E =hf equation. Does quantum mechanics dispute photon chunks of energy?

Thanks for the feed back. Those 2 links will keep me busy.

I am suggesting that mathematics and physics are both human constructs and that the limit we have with mathematics (infinities tat we get when we try and divide by zero), are showing up as a physical phenomenon in physics as we try and understand smaller and smaller time frames, energy levels...

Forgive me if I sound ignorant, but is it possible that quantum affects (value of h, why physical dimensions appear to come in discreet chuncks, etc) all stem from our mathematics (which originated as counting numbers -quantum steps). I do understand that calculus was invented to help remedy...

Thanks a lot for the very detailed explanation. I learned a lot from this thread.

Thanks. For those of us that don't understand 3 momentum vs 4 momentum can you give a quick example?

So using my previous example please explain using the math why the object that bounces off of the wall with enough momentum in Bob's frame to kill him but either does not bounce off the wall in Alice's frame or bounces off the wall with less momentum than required to kill Bob in Alice's frame...