Recent content by Chuck37

Sorry I'm just getting back to this after the weekend. The values inside are probabilities and thus always positive. I have brute force currently implemented, but when the matrix gets big, there are a lot of combinations and since I have to do it a lot, it adds up. Maximum product was...

I'd like to find a simple algorithm to do the following. If I have an NxM matrix, with N≥M, find the M entries with the maximum product that do not share a row or column. It doesn't seem hard, but I'm not seeing it right off.

I thought I read that if you were in a ship near the speed of light, all the stars would appear to be in front of you. The closer to c you are, the more everything will be collapsed to a cone facing forward. Is that right? Thinking about it a little from the non-moving frame, it seems like...

I'm not familiar with any relativistic stuff required on the receiver end besides Sagnac, at least for normal receivers. Jets and satellites might require something extra. What are you referring to?

I'm trying to understand the physics, so ignore the practicality of this. I want to know if I'm going really fast (relative to the frame I want to measure in) if I'll get the wrong answer using light time to measure distance.

It was just an example. I think if you were measuring from a satellite you could get a few millimeters.

I think you answered, but let me be more specific. There is a radar corner reflector on the ground at a known latitude and I'm in a supersonic jet flying towards it from the east. I know where I am using a GPS and I want to tell someone on the ground where the reflector is - I just need to...

Bringing this back up... if I'm moving very fast and using a radar to detect objects ahead, is there not a spatial dilation in my direction of travel that would cause me to get the wrong measurements? This is assuming my desire is to share information with someone not moving fast: "Object...

This is great. This paper answers my exact question. Thanks.

This is true if the space person measures using his own clock as truth. He could as easily say "I know all about relativity, my clock sped up from coming up here and is now running at 1.00001 MHz." With that mindset, there is also no shift during propagation down. It just transmits, and both...

Thanks for the reply. I said the clock was used as the reference. But no matter. Isn't only the former possible, since the clock is actually going faster? If we brought it back down we'd find that it was ahead in time compared to the one on the ground.

I knew my confusion was hard to explain, and I obviously did a bad job. Suppose I have two identical, perfect clocks and I take one into space. The one in space uses its clock as a reference and radiates RF down to earth. The clock in space is fast by something of the form √(1-2GM/(Rc^2)), I...

Here's my question first: If radio waves are transmitted from earth, are they actually redshifted, or is it that they appear redshifted when measured by an identical clock in space? Here's where I'm coming from. I'm trying to reconcile things I know. I think I know that (1) clocks further...

Yes, I think I just screwed up a sign in my math scratch here. The non-relativistic Doppler equation I have is (1-vrx/c)/(1-vtx/c) with v along the line from transmit to receive. Since vrx = vtx in this case, it all cancels. I got myself all confused for nothing... thanks for the replies.

Yeah, the Doppler should come out zero. What I'm trying to do is just an exercise where I want to observe the situation from a moving frame and arrive at the same answer. It's similar to the scenarios in my first message in this thread; I had a transmitter and receiver moving toward each other...