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  #1241  
Old 01.09.2011, 14:43
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Re: Ask a Scientist

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you'd hardly bolt two javelins to the outside of an engine and propeller and expect it to fly.
Who said anything about two?

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  #1242  
Old 03.09.2011, 12:16
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Re: Ask a Scientist

Is it possible to calculate the month of the year that this photo was taken?

It shows the sun streaming in the windows of Grand Central Station, New York. The time is 14:05 and the sun is at an angle of about 45 degrees.

Last edited by Deep Purple; 30.09.2011 at 17:28.
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  #1243  
Old 03.09.2011, 14:17
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Re: Ask a Scientist

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Okay, I'm gonna try this out. Any burning science questions that people would like answered, hopefully me and the other scientists on the forum can answer.

But remember, I'm a chemist, I'm not omniscient. I'll do my best.
1) Some mineral waters (with bubbles) are more prickly in the mouth than others. Is this due to it having more bubbles or stronger bubbles? Or due to another reason? How is this achieved?

2) Where can I find a charming, smart, good looking, funny, single woman (who also enjoys doing complicated personal income tax returns and has diverse interests ranging from mountain climbing to exotic travelling, visiting art fairs, museums, etc.)

That second question is for a friend
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  #1244  
Old 03.09.2011, 19:06
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Re: Ask a Scientist

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Where can I find a charming, smart, good looking, funny, single woman (who also enjoys doing complicated personal income tax returns and has diverse interests ranging from mountain climbing to exotic travelling, visiting art fairs, museums, etc.)
Yes, sorry that question was from me. Please just PM the answers directly through to my account as we don't want to let this thread drift off topic.
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  #1245  
Old 03.09.2011, 19:44
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Re: Ask a Scientist

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Well....basically if you have a cloud of particle of any type or colour, light will be scattered about. The bit of light that will be scattered about most/best is blue because it has the shortest wavelength (the long wavelength will go straight through (think of how radio waves with longer wavelengths like AM travel through walls better than short wave or FM radio)). So even without the colour of the particles, the colour of particulates are most likely to be more blue than any other colour. Of course, a cloud of red dust will be red because the colour of the actual particle is more relevant.
if the sky is blue due to blue light being scattered more, why is the late afternoon sky red? does the sun turn off blue emission after 4pm?
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  #1246  
Old 03.09.2011, 19:47
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Re: Ask a Scientist

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Is it possible to calculate the month of the year that this photo was taken?

It shows the sun streaming in the windows of Grand Central Station, New York. The time is 14:05 and the sun is at an angle of about 45 degrees.
Probably. I remember learning how to do this in O-level Geography but that was a very long time ago. There may be a few bits of info missing, beyond what you could figure out from a map of the area, but it can be done.
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  #1247  
Old 03.09.2011, 20:00
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Re: Ask a Scientist

Some reverse substitution into the calcs given here should help
http://hrsbstaff.ednet.ns.ca/mcfadde...e_latitude.htm


or if you have the time to investigate, here is a useful document:
http://www.sbse.org/resources/sac/PSAC_Manual.pdf
AYB

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Is it possible to calculate the month of the year that this photo was taken?

It shows the sun streaming in the windows of Grand Central Station, New York. The time is 14:05 and the sun is at an angle of about 45 degrees.
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  #1248  
Old 04.09.2011, 13:54
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Re: Ask a Scientist

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Is it possible to calculate the month of the year that this photo was taken?

It shows the sun streaming in the windows of Grand Central Station, New York. The time is 14:05 and the sun is at an angle of about 45 degrees.

April or September.



Finally that astronavigation comes in useful!
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  #1249  
Old 04.09.2011, 14:15
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Re: Ask a Scientist

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April or September.



Finally that astronavigation comes in useful!
Brilliant!

That is almost the answer that was given by Birmingham Planetarium. They say March or Early October.

They solved it with some free software they were promoting
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  #1250  
Old 05.09.2011, 23:18
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Re: Ask a Scientist

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if the sky is blue due to blue light being scattered more, why is the late afternoon sky red? does the sun turn off blue emission after 4pm?
When the sun is low in the sky, the path of the sunlight through the atmosphere is longer, so more of the sun's blue light is scattered, than when it is high in the sky. Since more blue light is scattered, the unscattered part, that comes to you direct from the sun, looks redder.
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  #1251  
Old 05.09.2011, 23:25
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Re: Ask a Scientist

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1) Some mineral waters (with bubbles) are more prickly in the mouth than others. Is this due to it having more bubbles or stronger bubbles? Or due to another reason? How is this achieved?
I think there are two reasons:
1) The most obvious point is that there is more or less carbon dioxide pumped into the water. More CO2 = more bubbles.
2) The odder part is that the different salt compositions of different makes of mineral water make the bubbles bigger or smaller, all things being equal.
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  #1252  
Old 06.09.2011, 09:49
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Re: Ask a Scientist

How do earphone cables get so tangled within 30 seconds of putting them in a bag or pocket and how (with winders or anything like that) can one stop that happening?
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  #1253  
Old 06.09.2011, 11:38
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Re: Ask a Scientist

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How do earphone cables get so tangled within 30 seconds of putting them in a bag or pocket and how (with winders or anything like that) can one stop that happening?
Don't put them in a bag or pocket ?
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  #1254  
Old 06.09.2011, 12:19
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Re: Ask a Scientist

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How do earphone cables get so tangled within 30 seconds of putting them in a bag or pocket and how (with winders or anything like that) can one stop that happening?
Personal hifi exist in multiple space-time continua (that's how one can get so much music into such a seemingly small device).

Accessories such as earphones have to straddle these continua, and what with all the vortices and eddies loopng and whirling between these many continua, a degree of backflow and turbulence is inevitable. This manifests itself in what appears to us to be a tangling and knotting of the earphones cable. Winders also have to inhabit this "worlds-inbetween" and thus are subject to the same laws, hence they too are of liitle or no use.

Another manifestation of this effect is, of course, that when someone connects themselves into these "parallel worlds" by putting the earphones in their ears, they effectively send their brain into some faraway universe and that telltale blank look comes into their face.
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  #1255  
Old 06.09.2011, 12:27
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Re: Ask a Scientist

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How do earphone cables get so tangled within 30 seconds of putting them in a bag or pocket and how (with winders or anything like that) can one stop that happening?
I think that the technical answer is something to do with the twist of the wires.

Best solution: get rid of the wires

Last edited by Deep Purple; 30.09.2011 at 17:28.
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  #1256  
Old 06.09.2011, 14:13
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Re: Ask a Scientist

After seeing the scientific proof of the after effects of facelifts, would you have one?

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  #1257  
Old 11.09.2011, 14:31
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Re: Ask a Scientist

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April or September.
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Brilliant!

That is almost the answer that was given by Birmingham Planetarium. They say March or Early October.

They solved it with some free software they were promoting
They have now revised their answer to April 3rd/4th or Sep. 6th.

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Anyway, the obvious solution is to find the two months of the year at which the sunlight would shine in at that angle (say 45 degrees for the sake of argument), at 14.05, allowing for summer time if in operation. This year, and not allowing for summer time, the dates are April 3 or 4 (altitude at 14.05 = 44 deg 50' and 45 deg 7' respectively), and September 6 (Altitude = 44 deg 56').
But I don't see any way, in the absence of other information, as to how you could determine whether it was spring or autumn.
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  #1258  
Old 20.09.2011, 18:09
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Re: Ask a Scientist

What's haskell? Is it useful for survival?
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  #1259  
Old 20.09.2011, 18:31
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Re: Ask a Scientist

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What's haskell?
The only Haskell I know is a pure function programming language, and still rather an esoteric beast.



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Is it useful for survival?
Probably not at the moment, tho' it's slowly making inroads into the mainstream ...
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  #1260  
Old 20.09.2011, 18:39
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Re: Ask a Scientist

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The only Haskell I know is a pure function programming language, and still rather an esoteric beast.

Probably not at the moment, tho' it's slowly making inroads into the mainstream ...
Aah, thanks. A couple of friends are reading this apparently romantic book as a bedtime story to eachother every night, Learn You a Haskell for Great Good! and are trying to convince me I will die a sad death if I don't know it.

So, I am ok. Nutin serious.
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