Recent content by petmar

The rod is rotating, and starts doing so at the same time as the light is turned on. They are in nearly the same location, and do not affect one another. The observer is just determining whether the rod rotates on his end, or if he sees the light, first. Astronaut 1 is inconsequential to the...

Clarification I should probably put up a diagram with this. The light is intense enough to be seen from that far away. It is also separated by some space (at least a meter) from the rod. Also, the rod is viewable to see if it is rotating (say it has a white dot near the edge so that you can see...

A "Simple" Thought Experiment Imagine you're out in space with no gravitational influence. Now, you have in this space a rod, 1 light-minute long, of some super-ridgid material. At either end of the rod, there's an astronaut. Astronaut 1 also has a flashlight. Astronaut 1 rotates the rod on...

the... pipe!

well, what i actually am looking for is the correlation between internal area, which would correlate with intensity, and length, which would correlate with λ, wavelength. from λ=v/f, i can then tell the rest of the story. that's all. would it be easier if i were to say that the...

i have a cylindrical pipe with a fixed internal diameter and a variable length. how would i calculate the resonant frequency of water within it, given that the speed of sound in water is approx. 1398 m/sec?

first of all, thanks for the compliment. second of all, those are for the limit notation. http://oregonstate.edu/dept/math/CalculusQuestStudyGuides/SandS/lHopital/Utility/lim_f_L.gif is the same as lim(x->a)f(x)=L. that's all that those are for, to denote arrows.

i thought those fences ran off 12VDC... don't they?

the world must be ending... ;-) here here! warren, for once, we agree.

true enough... i wonder, then, which is the cause, and which is the effect, of the elastic principle and the lowest energy state.

and now for something completely... the same. all i have to say is...BILL ODDIE, BILL ODDIE, PUT YOUR HANDS ALL OVER MY BODY!! you might want to check out the rest of what's over on rathergood.com, as well.

just remembered something... i work part time at a medical school in my neck of the woods as an ophthalmic tech (polarimetry). i remember once hearing about a guy with 20/100 (really bad) vision, walking to an optometrist after breaking his glasses by holding his curled-up hand in front of his...

i wonder if the door hit him on the way out... lol anyways, i was thinking that it might be due to the fact that space is essentially either flat, or of a set curvature, and since energy would distort that curvature, an elastic principle wants all points to go to the least possible energy...

... and, pencils down. well, let's see what we can do here. first of all, remember hooke's law for a vertical opposition system (a spring with a mass hanging from it): F=mg=-ky so, from this we know that the spring has a linear stretching dependent upon the mass placed on it. hang the spring...

i don't know if this should be in here... i was just looking at the "negative resistor" here, and noticed that it seems to be in the configuration of an inverted wheatstone bridge. if the resistance of one or both of the two non-loading arms of the circuit is less than one or both of the two...