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  #1341  
Old 19.11.2012, 19:13
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Re: Ask a Scientist

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So, it was the paper recycling day yesterday - it made me think. Is it even worth it collecting completely mushy, soaked through carton?
Yep, part of the process involves soaking the paper anyway

http://en.wikipedia.org/wiki/Paper_r...ycling_process

And Mr 22yards, you've put me right off my beer with that.
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  #1342  
Old 19.11.2012, 21:12
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Re: Ask a Scientist

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I got one. Though I'm loathe to use the term "bucket list", mine includes seeing the aurora. The sun's been getting uppity lately since it's at it's 11-year peak and by right we should be seeing tons of these.

So: why does the aurora go so much further south in North America than Europe? They had some in Iowa last week at ~40° latitude. We're closer to 48° but did get any. In fact it was well into the fifties before they started appearing. Why is this? Does it have something to do with the difference between geographic north pole vs. magnetic? IE, magnetic north is more in the direction of North America than geographic north?
Is it that in the US you have a very large land mass, while in Europe there is much sea water. This will conduct the electric charge away better, and so shorting it to ground. (That is my own idea)
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  #1343  
Old 19.11.2012, 22:21
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Re: Ask a Scientist

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I got one. Though I'm loathe to use the term "bucket list", mine includes seeing the aurora. The sun's been getting uppity lately since it's at it's 11-year peak and by right we should be seeing tons of these.

So: why does the aurora go so much further south in North America than Europe? They had some in Iowa last week at ~40° latitude. We're closer to 48° but did get any. In fact it was well into the fifties before they started appearing. Why is this? Does it have something to do with the difference between geographic north pole vs. magnetic? IE, magnetic north is more in the direction of North America than geographic north?
Good call! Here's a site that tells you all about it.

http://www.swpc.noaa.gov/Aurora/
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  #1344  
Old 19.11.2012, 22:35
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Re: Ask a Scientist

Where can you get Protein and calcium apart from a cow or a beast?
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  #1345  
Old 19.11.2012, 22:46
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Re: Ask a Scientist

Hope pizza won't give me pizza face.

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Yep, part of the process involves soaking the paper anyway

http://en.wikipedia.org/wiki/Paper_r...ycling_process

And Mr 22yards, you've put me right off my beer with that.
Aaah, papermache and all that, right.

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Where can you get Protein and calcium apart from a cow or a beast?
I heard extended breastfeeding works well.
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  #1346  
Old 19.11.2012, 22:49
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Re: Ask a Scientist

Top mark on your answer
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  #1347  
Old 27.11.2012, 04:08
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Re: Ask a Scientist

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Where can you get Protein and calcium apart from a cow or a beast?
Legumes, etc. Also, spending time in proper sunlight.

Seriously, just Google calcium rich foods, and you will find tons of info.

I don't really have a problem as I eat lots of animal derived products, but I assume that you are approaching this from a slightly different perspective.
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  #1348  
Old 27.11.2012, 07:45
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Re: Ask a Scientist

Regarding calcium, what if my GF is away for a week? Will I get calcium withdrawal symptoms?
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  #1349  
Old 27.11.2012, 14:35
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Re: Ask a Scientist

Offering up my services as an entomologist if any has questions about insects.
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  #1350  
Old 10.01.2013, 22:43
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Re: Ask a Scientist

OK....one for the scientists....

So I'm a trained engineer and physicist so I know about mechanics and energy and power and stuff....but

If I run 10 km, then I will use an amount of energy required to haul by 84kg ass around a 10km route.....in my physics mind, that amount of energy shouldn't change on speed. If I do it faster, I need more power, but I need it for a shorter period. If I go slow, less power but for a longer period. Same energy used

So how come if I run the route fast, I apparently burn more calories than if I do it slow? Its instinctively true of course, but what is the science?

Thanks
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  #1351  
Old 10.01.2013, 22:49
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Re: Ask a Scientist

Body takes energy from different sources depending on how quickly it needs it. Plus the higher end heart rate requires longer for the metabolism to return to normal after the run. Plus a bit more resistance (muscles, air).

This is more of a medical question and I, also, would be very keen to hear a proper answer!
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  #1352  
Old 10.01.2013, 22:55
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Re: Ask a Scientist

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Body takes energy from different sources depending on how quickly it needs it. Plus the higher end heart rate requires longer for the metabolism to return to normal after the run. Plus a bit more resistance (muscles, air).

This is more of a medical question and I, also, would be very keen to hear a proper answer!
Having read yours, me too.
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  #1353  
Old 10.01.2013, 23:01
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Re: Ask a Scientist

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OK....one for the scientists....

So I'm a trained engineer and physicist so I know about mechanics and energy and power and stuff....but

If I run 10 km, then I will use an amount of energy required to haul by 84kg ass around a 10km route.....in my physics mind, that amount of energy shouldn't change on speed. If I do it faster, I need more power, but I need it for a shorter period. If I go slow, less power but for a longer period. Same energy used

So how come if I run the route fast, I apparently burn more calories than if I do it slow? Its instinctively true of course, but what is the science?

Thanks
It would be too easy to google the answer.

I also did physics so I know where you are coming from.

It has to be about the acceleration. It has to also be about the body's efficiency at developing power at a given output.

Muscles mainly develop power by oxidising ATP in the mitochondria. But this requires oxygen. Oxygen comes from blood so parts of the rest of the body have to work to increase the blood oxygen supply. This means your lung muscles must work harder, your heart beats faster. Respiration products like co2 and lactic acid increase in concentration and inhibit efficiency. All that ATP oxidation releases heat which must be dumped along with the waste products.

That's my guess.
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  #1354  
Old 10.01.2013, 23:08
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Re: Ask a Scientist

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It would be too easy to google the answer.

I also did physics so I know where you are coming from.

It has to be about the acceleration. It has to also be about the body's efficiency at developing power at a given output.

Muscles mainly develop power by oxidising ATP in the mitochondria. But this requires oxygen. Oxygen comes from blood so parts of the rest of the body have to work to increase the blood oxygen supply. This means your lung muscles must work harder, your heart beats faster. Respiration products like co2 and lactic acid increase in concentration and inhibit efficiency. All that ATP oxidation releases heat which must be dumped along with the waste products.

That's my guess.
One cannot ask google to clarify

I'm not buying most of your answer, sorry. Acceleration doesn't play a part except for the first second from standstill to constant speed.

And of course, running faster makes your heart beat faster which needs more power, but for a shorter period of time.

BUT...the heat bit is interesting, maybe its that
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  #1355  
Old 11.01.2013, 00:47
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Re: Ask a Scientist

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OK....one for the scientists....

So I'm a trained engineer and physicist so I know about mechanics and energy and power and stuff....but

If I run 10 km, then I will use an amount of energy required to haul by 84kg ass around a 10km route.....in my physics mind, that amount of energy shouldn't change on speed. If I do it faster, I need more power, but I need it for a shorter period. If I go slow, less power but for a longer period. Same energy used

So how come if I run the route fast, I apparently burn more calories than if I do it slow? Its instinctively true of course, but what is the science?

Thanks
I think I know the answer to this. And this is coming from a geologist (which, I think, some still consider to be as scientists...or at the least science-like).

It's a question of reserves. There is a chance that when it is time to haul ones ass around the 10km torture route your previous nights reserves of malted hops and barley may affect your performance. If you've had too much beer the night prior, you will run slower as a result of latent calorie depletion. If you've had just a bit of beer you will likely be more spry the following day. This will leave you with less latent calories to burn and more of a fighting chance to move at a respectable clip...hence burning more calories.

This solution may not work for everyone. In general this has been my experience...but I think this solution might just be observed by the geologist community only since, after all...we all tend to be functional drunks.
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  #1356  
Old 11.01.2013, 05:43
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Re: Ask a Scientist

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One cannot ask google to clarify

I'm not buying most of your answer, sorry. Acceleration doesn't play a part except for the first second from standstill to constant speed.

And of course, running faster makes your heart beat faster which needs more power, but for a shorter period of time.

BUT...the heat bit is interesting, maybe its that
It may still not be relevant to the answer, but isn't forget acceleration simply rate of change of velocity?

work done = F . d

F = m . a

You need to maintain your velocity, which means working against wind, changes of direction, frictional losses, coefficient of restitution of muscles...
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  #1357  
Old 11.01.2013, 05:56
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Re: Ask a Scientist

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OK....one for the scientists....

So I'm a trained engineer and physicist so I know about mechanics and energy and power and stuff....but

If I run 10 km, then I will use an amount of energy required to haul by 84kg ass around a 10km route.....in my physics mind, that amount of energy shouldn't change on speed. If I do it faster, I need more power, but I need it for a shorter period. If I go slow, less power but for a longer period. Same energy used

So how come if I run the route fast, I apparently burn more calories than if I do it slow? Its instinctively true of course, but what is the science?

Thanks
It is because the body works as a self preserving computer, it creates fat and burns fat depending on the situation it faces. If you are fat you will loose weight, but if you are thin you will not. If you have recently dieted the body will store more fat in case another famine arrives soon: it assumes you are a useless hard working farmer and not a clever lazy engineer.
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  #1358  
Old 11.01.2013, 08:25
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Re: Ask a Scientist

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One cannot ask google to clarify

I'm not buying most of your answer, sorry. Acceleration doesn't play a part except for the first second from standstill to constant speed.

And of course, running faster makes your heart beat faster which needs more power, but for a shorter period of time.

BUT...the heat bit is interesting, maybe its that
It is the heat bit. Energy is a state function. Heat and work are not, they are path-dependent. The amount of calories you burn is dependent on how much work you do and how much heat you generate.
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  #1359  
Old 11.01.2013, 11:17
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Re: Ask a Scientist

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...If you have recently dieted the body will store more fat in case another famine arrives soon: it assumes you are a useless hard working farmer and not a clever lazy engineer.
I think we agree in principle: Extra calories in...extra calories out.

There you have it...another one of life's mysteries solved. And all of this before noon.
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  #1360  
Old 11.01.2013, 11:27
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Re: Ask a Scientist

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I think we agree in principle: Extra calories in...extra calories out.

There you have it...another one of life's mysteries solved. And all of this before noon.
Agreed. Excellent. Doesn't answer the question though
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