Recent content by Alfreds9

Hello, I am having a headache to try understand a possibly simple real-world problem: efficiency (as in number of strokes/cumulative length needed) to saw steel, assuming a constant sawing length per stroke and a known steel sectional area. I began to think about the few assumptions I assume...

Thank you for your replies. You're right, I forgot to add that most sounds would probably be randomly scattered within 10m from soil level, possibly centered around a fixed point in the valley and they would be prevalently distributed in the lower parts of the valley, within half of Hmax...

Hello, I have a practical problem, I'd like to find the "best" spot to hear sounds in a valley (forgive me if "acoustic point" isn't an appropriate term, I just couldn't come up with anything better and scrolling an acoustics text didn't help), or at least a non-blind spot (one which instead...

I see, thank you. I erroneously thought it was #3 since I supposed the greater surface area of porous particles could play a role into replacing water vapor content in air more efficiently than porous particles slightly closer to measuring point.

Hello, I'd like to know which of these 3 example I sketched would have a steadier and higher air humidity at measuring point, assuming same conditions (except those illustrated as different, like porous media thickness and measuring point), water level and air turbulence within larger container...

I see, didn't think about this, thank you very much...I always thought that zenith was zenith and it didn't vary noticeably, with temperature variations being mostly dependent on light hours and longer peak time. Where can I find peak average solar irradiation by month (meaning the average...

Hi, I was thinking if maximum light intensity underwater during seasons changes somehow. I firstly thought about considering monthly solar irradiance (http://neo.sci.gsfc.nasa.gov/view.php?datasetId=CERES_INSOL_M) however I thought this would have been biased at certain latitudes due to...

I can't get my head around this (or maybe I just explained my question poorly): if one considers only the weight-bearing area as you suggest, wouldn't a smaller supporting area yield a higher pressure even if weight stays the same, something which doesn't make sense to me since I guess that...

I see, now it makes sense, thank you very much!

I (perhaps wrongly) assumed that pressure inside a bottle with a weight sitting on top should be higher than pressure inside a bottle with no weight on? Here's a sketch I did

I've uploaded it again, hopefully this works now

I have this same question. Could the internal pressure be approximated to Force/Surface, so (mass*g)/surface area of a bottle? How inaccurate would this be? Thank you

I see thank you. I've read that while following the same rules of visible light, they reflect a lot less, how true is this? Thank you for the links

You're right, of course here it is. [Questionable link deleted by moderator. See the image in post 9 instead] Basically just a small-ish floating stand. Thank you

Hello, I'd like to know which book or papers I'd read to understand, possibly without too rigorous mathematics knowledge, how do photons like X-rays or gamma ones reflect off surfaces and attenuate through solids or generally speaking, facts about how do they interact with the real world. So...