14-02-2011, 12:33 AM #1 flyermay Banned   Join Date: Jan 2009 Location: back on the DIF Posts: 7,500 Likes: 2 (2 Posts) Ask your questions about science... What the title says... If you have any questions or doubts about science, I'll gladly try to answer them and help you solve your doubts. Remember: there are no stupid questions in science. Last edited by flyermay; 14-02-2011 at 12:34 AM.
 14-02-2011, 12:40 AM #2 steevo Inactive   Join Date: Jun 2007 Location: UK Posts: 13,863 Likes: 7 (7 Posts) How come we only ever see one side of the moon ?
14-02-2011, 12:50 AM   #3
flyermay
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Quote:
 Originally Posted by steevo How come we only ever see one side of the moon ?
lol

Welcome Steevo.

Well, the theory says that the moon is affected by 2 different forces: the force of gravity, which keeps it orbiting around the earth; and the force of inertia, which makes it spin on a continuous motion around its own axis. But what happens with the moon is that both forces are synchronised; that is, it takes the moon the same amount of time to orbit around the earth, as it takes it to spin around its own axis. Therefore, we always see the same side of the moon.

Hope this helps.

Last edited by flyermay; 14-02-2011 at 12:53 AM.

14-02-2011, 12:53 AM   #4
steevo
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Quote:
 Originally Posted by flyermay lol Welcome Steevo. Well, the theory says that the moon is affected by 2 different forces: the force of gravity, which keeps it orbiting around the earth; and the force of inertia, which makes it spin on a continuous motion around its own axis. But what happens with the moon is that both forces are synchronised; that is, it takes the moon the same amount of time to orbit around the earth, as it takes it to spin around its own axis. Therefore, we always see the same side of the moon. Hope this helps.
Not really

lol

14-02-2011, 01:07 AM   #5
flyermay
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Quote:
 Originally Posted by steevo Not really lol
What's not really?

 14-02-2011, 02:30 AM #6 truthseeker512 Senior Member   Join Date: Apr 2010 Location: near/on/in/under a Pyramid (no hills) Posts: 1,484 Likes: 0 (0 Posts) How come a planatary probe to venus reported back temperatures hot enough to melt lead and yet that very probe is supposed to have touched down with regular nylon parachutes?
 14-02-2011, 02:32 AM #7 truepositive Senior Member   Join Date: Jan 2011 Posts: 3,008 Likes: 71 (36 Posts) Do you feel quantum mechanics are support for the idea that we live in a 'changing universe' rather then a 'set universe'?
14-02-2011, 04:50 AM   #8
moving finger
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Quote:
 Originally Posted by truthseeker512 How come a planatary probe to venus reported back temperatures hot enough to melt lead and yet that very probe is supposed to have touched down with regular nylon parachutes?
http://www.planetary.org/explore/top.../missions.html

Most of the early probes were crushed before reaching the ground by atmospheric pressure.

The successful ones used aerobraking as well as parachutes to slow the craft down. The upper atmosphere is not as hot as it is near the ground. I haven't seen what the parachute was actually made of but the melting point is somewhere between 220 & 265 celsius depending on what sort of nylon it is. Surely it could be treated to make it more heat resistant?

 14-02-2011, 04:53 AM #9 hadabusa Banned   Join Date: Jun 2009 Location: zurich Posts: 22,683 Likes: 3 (3 Posts) egg or chicken?
14-02-2011, 05:12 AM   #10
boots
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Quote:
 Originally Posted by hadabusa egg or chicken?

lol this is a good one.

I say egg.

.

 14-02-2011, 05:13 AM #11 the tealady Forum Advisor     Join Date: Jun 2009 Location: Down by the sea Posts: 18,965 Likes: 4,647 (2,475 Posts) Here goes: oxygen is carried around the body by attachment to red blood cells. How are the molecules attached? magnetically, chemically or by some other way and does only one oxygen molecule attach to each red cell or are there multiples? Plus do the insects with green blood work the same way? __________________ Unlike a lot of other people, David walks the talk. Be careful who you trust in this alternative media and research. Please don't feed the trolls. When I LIKE a post, it does not always mean I agree, it can also just mean I think a valid point has been made.
 14-02-2011, 05:18 AM #12 boots Banned   Join Date: Oct 2007 Location: OZ Posts: 15,676 Likes: 432 (307 Posts) Why dont cockroaches grow any larger than they are now, or for that matter any insect? .
14-02-2011, 06:26 AM   #13
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Quote:
 Originally Posted by ozpixie Here goes: oxygen is carried around the body by attachment to red blood cells. How are the molecules attached? magnetically, chemically or by some other way and does only one oxygen molecule attach to each red cell or are there multiples? Plus do the insects with green blood work the same way?
It binds at the molecular level. The main active molecule involved is iron, which has a very strong affinity for oxygen (which is why iron goes rusty very easily, it oxidises). I saw one figure suggesting each blood cell can carry around 4 million oxygen molecules.

The exchange of oxygen and carbon dioxide is related to the defferent molecular weights of CO2 and O2 and how this interacts with haemoglobin. Carbon Monoxide, for example, is much easier for the cells to bind with, which is why it is fatal even in relatively small concentrations even where oxygen is still present.

 14-02-2011, 06:56 AM #14 kiolm Senior Member   Join Date: Jan 2011 Posts: 1,352 Likes: 1 (1 Post) Why is sleep the most important thing we do other than breathing? __________________ I offer the moonies my signature if they can post one photo with evidence for a rocket on the moon. Moonies, Never letting the facts get in the way of a good story. Also explain how 2 planes can bring down 3 buildings
 14-02-2011, 09:16 AM #15 tinyint Inactive   Join Date: Nov 2009 Location: Meerkat Manor Posts: 20,776 Likes: 9 (8 Posts) Where do electrons and proton get their energy from? How does a charge produce energy, ie how gets an electric current its energy and from where? You may think twice before answering, since it generally contradicts the law of energy preservation. It is a problem there with our current understanding of electro-magnetic charges and the source of the charges. Conventional standard physics simply ignore and have successfully veiled that. ^^
 14-02-2011, 10:16 AM #16 the apprentice Inactive   Join Date: Jan 2010 Posts: 22,637 Likes: 2,987 (2,092 Posts) What is the safe level for humans to breath Co2, at what level does it become unbeneficial.
 14-02-2011, 10:33 AM #17 spyroid Inactive   Join Date: Jan 2011 Posts: 805 Likes: 0 (0 Posts) I'd love to know the original experiments that led to this; It's a great film, but it appears it's the work of some kind of pseudo science quasi religious cult spearheaded by a channeller. While I'm not necassarily saying that's a bad thing , it means the conclusions reached may not tally directly with any actual experiments, so I'd love to be able to look into it myself.
 14-02-2011, 10:55 AM #18 rodin Banned   Join Date: Jul 2009 Location: location location Posts: 16,981 Likes: 3 (3 Posts) What does the arrow annotated by L represent in the physical world? It is not a force, so what is it? And why does it change sense according to rotation direction?
14-02-2011, 10:57 AM   #19
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Quote:
 Originally Posted by boots Why dont cockroaches grow any larger than they are now, or for that matter any insect? .
The theory (i believe) goes like this: There is less oxygen in the air now, which means that all creatures cannot grow as large as they used to be.

Quote:
 Originally Posted by truepositive Do you feel quantum mechanics are support for the idea that we live in a 'changing universe' rather then a 'set universe'?
Most likely. Im not sure exactly what you mean though.
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 14-02-2011, 11:04 AM #20 rodin Banned   Join Date: Jul 2009 Location: location location Posts: 16,981 Likes: 3 (3 Posts) Here is a quasar image Like several I have studied it has a central source and is accompanied by two masses equidistant from and co-axial with the centre What causes the axial emanations to be arrested at a certain distance from the core? Last edited by rodin; 14-02-2011 at 11:05 AM.

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