Recent content by jakesee

Hi Jupiture6, I am after the pressure drops in the process fluid a pressure vessel is holding as it gets heated up from the inlet to the outlet while in the heater vessel. Hope I am clear on that. Thanks!

I am writing a software that involves calculation of pressure drops in a electric heater pressure vessel as in related to pipes and flanges as described in ASME B16.10, B16.47, B36.10. I am not a mechanical engineer, but in order to create an intuitive data input sequence (and for my...

The ANSI standards for engineering seems to be always published in a table form like this http://en.wikipedia.org/wiki/Nominal_Pipe_Size but it looks like a really limited way of displaying results. Why is it that there isn't any formulas we can use to compute the results rather than look up...

@es1 looks like i am bad at math as well.. haha.. yea 20Hz = 50ms and the signal is at theoretical speed of light for wireless transmission. BUT... that's why I am asking, i suspect in practical situations, the range and speed are all affect, so if anyone know the practical values, i'd...

Hi, Anyone has had experience with UAV control/signal design can tell me what is the typical flight speed (surveillance UAV), control range, link speed and control delay like? (Sorry, I am not a very good engineering student, furthermore control and signal not my discipline... I can only...

Thanks for your reply. I totally forgot about the distance issue when I posted. Thanks for reminding. Also, i think now the problem becomes even more difficult because of varying distancings considering the flight velocity of UAV... sigh. Thanks.

Hi, I am working on a software control system with visual terrain rendering for UAV navigation. I am new at this, and I have some issues not clear with regard to signals. Can anyone tell me if all wireless datalinks (at least for existing tech) are at speed of light? And if it is true...

Thanks for the replies, I'll be reading the suggested topics a while before coming back. thanks thanks. =)

Hi, May I ask, if there is a sufficiently long rod falling vertically downwards due to gravity, and then at an instance, a horizontal force is applied at one end of the rod, will this force create a torque on the rod? If so, where is the axis of rotation? Second question, if a body, not...

I think you misunderstood. I really just meant states. But it's ok, please get back to the point and just respond to the topic starter.

Yes I did, but I figured if someone could argue "Grand Father" paradox as flawed and offer alternative explanation, I think I could casually do so, for this thread only, as well? No? I don't see how we can have a discussion if we can only agree? Not that my opinion is any valuable but I just...

Alright, I'll try to read more first. And yes, my bad, I totally missed the first sticky. Any case, thanks =)

Opps, my bad. I read the "READ ME FIRST" but totally missed the first sticky. Sorry.

I think the grandfather paradox is more like a result of say, quantum teleportation in the time dimension rather than time travel in relativity sense. Somehow, it seems that discussions have omitted the possibility that going back into time also changes our age (5th dimension), conciousness...

Hi, I chanced upon https://www.physicsforums.com/showthread.php?t=321935 and read Doc AI's reply basically saying: if 2 bodies moving near speed of light relative to each other, the clocks on the other body will appear slower on either body. And I think this should theoretically mean the...