Recent content by Halc

OK, so you're throwing a ball without spin, upward to the wall where it hits at the peak of its parabolic trajectory. It applies a varying amount of force to the wall during the time in which it is in contact. So far so good. It seems to be all you have to say. Was there a question involved...

If an emitter at the edge or the spindle was to hit a mirror at the other location, reflecting its own signal back to the source, the signal would not be redshifted at all so long as the distance between the two remains constant. So spinning would have no effect on this. You would be firing...

Agree. My term 'true' implies that one is false (sort of like centrifugal force in an inertial frame), which transverse Doppler isn't. I was simply pointing out that it isn't an effect in addiction to the relativistic gamma factor. It is pure time dilation per special relativity. You correctly...

Transverse Doppler is not a true Doppler effect, which has to do with changing distance between emitter and detector. The transverse effect is purely due to relativistic time dilation, and not something in addition to it. I just wanted to make that clear to the OP. Total energy is the same...

With the ball case, each ball color is independent, and thus the probability of the final ball is the same as any single ball, 50/50. But the child problem is worded differently. There's only a third chance that the other child is a boy since only one out of three sets of two children with at...

Drawing, however poor, is probably enough. Getting R requires a demonstration that O' - A - B lie on a straight line (as drawn, but how do you prove that?), and then it's just algebra with quantities that are known. The forces involved are irrelevant to the computation of radius.

The initial comment I had was that 'resistance is futile'. I mean, if the killers offered no resistance, then the two on the bottom left will short out the load, and the two on the right would not be currently killing. (or not killing current?) If the killers do offer resistance, then what's...

This whole thing seems similar to a rubber-band around some object. A rubber band going once around an object can lay flat, without twists, similar to the first picture. If the band goes around twice, there's a full twist to it (2π), and it cannot lay flat (2nd picture) If it goes around thrice...

Not only infinite, but there is also no bound on the number of consecutive zeros in the decimal expansion of pi. No way to prove that of course, but any length of finite run has a probability of 1. What is interesting about this is if they are countable. I mean, it's a subset of the total...

Mind you, the distance below which billions die is perhaps 3 ticks from the origin. This is astronomers we're talking about.

Intel solved this problem by using little-endian protocol (10-10-4202) Being a Unix/Linux guy, I've always mourned the standardization of the Intel architecture over say 68xxx, but by golly, the Intel guys got the endian thing right. I've tracked down countless bugs due to big-endian confusion...

Just a pulse of light, sent at some event and received (measured) at another. The pulse in this case is not being used to sync anything. FactChecker is referring to an array of clocks all stationary in some frame. So in the case of the Earth frame (E), there would be the stationary clock on...

Some examples: Relative to Paris (a rotating accelerating reference frame), Neptune is moving faster than c. This frame is not inertial, not even locally, as evidenced by an accelerometer placed at Paris. Relative to the cosmic frame (proper distances), GN-z11 (no longer the 'most distant...

At 0 degrees you'll be lifting half the weight, the other half being born by the far edge. At 10 degrees, a substantial majority of the weight lays on the far edge. Power depends on how fast you do it. It theoretically can be done with negligible power no matter the size of the block, if you're...

I didn't, but Baa Baa Black Sheep did make a round in my head