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  #1061  
Old 18.06.2010, 11:51
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Re: Ask a Scientist

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A small water turbine in the shower head?
you are right Gastro! Apparently they put tiny turbines to increase air-water mix thus reducing water consumption. The very same turbine is used to generate enough power for leds (US patent link). It must be very tiny.
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  #1062  
Old 18.06.2010, 12:05
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Re: Ask a Scientist

I don't know why I thought of this question recently but here goes,

When flying the window shutters need to be open during take off and landing. Why?

I asked a member of the cabin crew when I was last flying but they had no idea. Any insights appreciated
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  #1063  
Old 18.06.2010, 12:16
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Re: Ask a Scientist

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I don't know why I thought of this question recently but here goes,

When flying the window shutters need to be open during take off and landing. Why?

I asked a member of the cabin crew when I was last flying but they had no idea. Any insights appreciated
I believe it is case there is an accident so that the rescue crew can see where people are or if there are any survivors.
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  #1064  
Old 18.06.2010, 12:47
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Re: Ask a Scientist

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I don't know why I thought of this question recently but here goes,

When flying the window shutters need to be open during take off and landing. Why?

I asked a member of the cabin crew when I was last flying but they had no idea. Any insights appreciated
I remember in one of the "Air Crash" episodes they mentioned that pilots can't see the engines, so if something is wrong with the engine (fire, smoke, fuel leak) the passengers or crew members can give alert. Most accidents happen during take-off or landing..that's why i gues.
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  #1065  
Old 18.06.2010, 12:49
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Re: Ask a Scientist

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I believe it is case there is an accident so that the rescue crew can see where people are or if there are any survivors.
That is my belief/understanding(/hope!) too.
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  #1066  
Old 18.06.2010, 12:54
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Re: Ask a Scientist

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I believe it is case there is an accident so that the rescue crew can see where people are or if there are any survivors.
something like that ....
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  #1067  
Old 18.06.2010, 16:18
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Re: Ask a Scientist

It may sound stupid, but why goal frame in football is often hit by the ball!?
It's a rather thin bar so statistically it should be hit very seldom.
Can it be because forward player look at the frame too much during shots or ...
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  #1068  
Old 18.06.2010, 16:21
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Re: Ask a Scientist

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It may sound stupid, but why goal frame in football is often hit by the ball!?
It's a rather thin bar so statistically it should be hit very seldom.
Can it be because forward player look at the frame too much during shots or ...
Ask yourself this. Is the woodwork really hit that often?

I would say not. Ronaldo hit the woodwork for Portugal. Anyone else during the matches held so far? As a total pecentages of shots on goal how many hit the wordwork, were saved by the goalie or flew into the stands.

I think you'll find that it doesn't hit the woodwork that often...
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  #1069  
Old 18.06.2010, 16:21
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Re: Ask a Scientist

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It may sound stupid, but why goal frame in football is often hit by the ball!?
It's a rather thin bar so statistically it should be hit very seldom.
Can it be because forward player look at the frame too much during shots or ...
It is hit very seldom BUT. The fact is that the most difficult shots to cover are always near the frame (angles). Most players will try to aim in those areas and hence hit it. Nobody locks dead on to the goalie
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  #1070  
Old 18.06.2010, 16:22
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Re: Ask a Scientist

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It is hit very seldom BUT. The fact is that the most difficult shots to cover are always near the frame (angles). Most players will try to aim in those areas and hence hit it. Nobody but England locks dead on to the goalie
Fixed that for you...
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  #1071  
Old 18.06.2010, 16:26
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Re: Ask a Scientist

In Germany Serbia game which is finished right now it happened 3 or 4 times!
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  #1072  
Old 18.06.2010, 16:27
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Re: Ask a Scientist

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It may sound stupid, but why goal frame in football is often hit by the ball!?
It's a rather thin bar so statistically it should be hit very seldom.
Can it be because forward player look at the frame too much during shots or ...
It isn't. It's just that you notice it.

Cuz if it doesn't hit it, there's nothing to remember. Selective stats, sorry.
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  #1073  
Old 18.06.2010, 16:27
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Re: Ask a Scientist

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In Germany Serbia game which is finished right now it happened 3 or 4 times!
Yeah and it didnt hit the post 30+ times.
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  #1074  
Old 18.06.2010, 16:30
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Re: Ask a Scientist

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In Germany Serbia game which is finished right now it happened 3 or 4 times!
Yeah and it didnt hit the post 30+ times.
Would that be ∞ times or are you only including "shots" (both on and off target)?
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  #1075  
Old 18.06.2010, 16:31
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Re: Ask a Scientist

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It isn't. It's just that you notice it.

Cuz if it doesn't hit it, there's nothing to remember. Selective stats, sorry.



Goal Keeper is covering around 75% of the goal due to the angle. Leaving corners as possible targets as well as the upper part of the frame.

But as hashbrown says, a Ball hitting the Frame is much easier to remember due to the "almost-goal" feeling that it provides.

Last edited by Ouchboy; 18.06.2010 at 16:39. Reason: put a more pro pic
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  #1076  
Old 18.06.2010, 16:37
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Re: Ask a Scientist

A question if I may...

Why do most economists wear bow ties?

Answers offered via the medium of graphs are trumps.
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  #1077  
Old 18.06.2010, 16:43
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Re: Ask a Scientist

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A question if I may...

Why do most economists wear bow ties?
Cuz they're twats.
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  #1078  
Old 18.06.2010, 16:51
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Re: Ask a Scientist

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Question to any gear heads:

Ive been reading gear formulas for a few days, and cant figure out how to relate module, or pitch diameter to any physical dimension of the gear. I have a technical drawing of a gear with 18 teeth. it says module 2 and pitch diameter 36.6. That doesnt agree with the formulas, so which can I determine correct by another means?

If two gears are mating properly such that their pitch diameters are tangent, then they are pulled slightly apart (but still meshing) are the pitch diameters still the same?

thanks
"Module" is the pitch diameter divided by number of teeth - so you're right, there's something wrong with this picture! (Two gears which are meant to mesh should have the same module, i.e. same size teeth.)

I assume the tooth count is right and a modulus of 2.0333... would be unusual to say the least; so it's probably the pitch diameter that is dimensioned wrong. Could be that a gear with 36.0 pitch diameter is being run at 36.6 operating pitch diameter (you'll have some backlash but it should still mesh.)

Any info on the gear that meshes with this one? As I said before they should have the same module, same pressure angle, and if you know the (operating) center-to-center distance, that should be equal to half the sum of the two (operating) pitch diameters.
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  #1079  
Old 18.06.2010, 16:52
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Re: Ask a Scientist

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I remember in one of the "Air Crash" episodes they mentioned that pilots can't see the engines, so if something is wrong with the engine (fire, smoke, fuel leak) the passengers or crew members can give alert. Most accidents happen during take-off or landing..that's why i gues.
I know take off and landing are the most dangerous parts but if a passenger needs to alert a cabin member during take off of something then it is far too late to do anything anyway. I think I am going to go with the rescue effort reason I'm afraid. Thanks for the guesses guys
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  #1080  
Old 18.06.2010, 17:54
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Re: Ask a Scientist

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When flying the window shutters need to be open during take off and landing. Why?
Shutters are opened (and the cabin lights dimmed at night) so that in the event of an external fire (e.g. an engine fire) on the ground, one can see which exits are clear of fire and which are not.

Take a glance at the photos in the report of the Manchester Airport British Airtours 28M disaster, and all becomes v clear who survived while getting out and who died
(The bottom of Page 6 of the report also tells you why you want a big, strong, switched-on type sitting beside the overwing exits...)
.
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