Recent content by CatAteMyHW

I was learning about the same topic and found this problem. As per HallsofIvy, k1(1v1 + 2v2 + 0v3) + k2(0v1 + 3v2 - 1v3) + k3(1v1 - 1v2 + 1v3) = 0 rearranging... v1(1k1 + 0k2 + 1k3) + v2(2k1 + 3k2 - 1k3) + v3(0k1 - 1k2 + 1k3) = 0 now, coefficients of v must be 0 1k1 + 0k2 + 1k3 =...

I've chosen words correctly... I think. Motion is always related to things (particles, bodies etc) and not events. You cannot move an event! A thing moves - that's an event (or a set of events). I would agree with "without motion there is no time". In fact that's my whole point. Can you measure...

Thanks for the input. Consider this.. Let's have a simpler clock used as a standard in relativistic time-dilation examples. Two parallel planks 1/299,792,458 of a meter apart with a photon oscillating between them. Now let's say you fire a photon and time the duration with that clock till it...

Good-evening members! For some time now, time is really bugging me. Especially this line in the Wikipedia entry on Time I came across http://does-time-exist.info/" that says that time is sort of an illusion created by motion of things in space. So my question is, can we describe motion by...

Yup. In fact my intent was to have something better than just guessing "That car must've been above 100!". So as long as I take the measurements in just the right conditions I can guess with a level of certainty. Yup. Though I'm relying on the brain's 3-D perception for minimizing parallax...

Yea, thanks for seconding on that. I calculated it to be just 'y' myself. But when posting, I looked at the stunningly accurate graphic(/s) I made in MS paint and saw that carB is covering twice the distance than carA in each 'second' so something must've been wrong in my calculation d'oh...

Yes. That was the first thing on my mind but I realized buying one (or using it where I live) wouldn't be too easy for me for some reasons. But isn't all-done-in-head way much cooler? I can see how this would seem trivial to you guys calculating and exploring speeds much much greater than...

Hello everyone! I was just wondering that while driving, is there a way to calculate speed of an other car that passes you? I worked out a way but I needed more heads on this [that's what she..meh] so here's it: When the car traveling faster than me goes pass me(me - carA;other car - carB), I...