Search the archive:
 YaBB - Yet another Bulletin Board
 
   
 
  Simviation Forum › General › General Discussion › Silly question
(Moderators: Mitch., Fly2e, ozzy72, beaky, Clipper, JBaymore, Bob70, BigTruck)
‹ Previous Topic | Next Topic ›
Pages: 1 2 3 4 5 6
Send Topic Print
Silly question (Read 1538 times)
Reply #30 - Sep 9th, 2003 at 7:43am

Polynomial   Offline
Colonel
Health is merely the slowest
possible way to die.
Brisbane, Australia

Gender: male
 Posts: 1951
 *****
 
Quote:
Thanks for the info Craig and PolyN. I've never really paid any attention to the clocks and radios and beams etc. I don't have a manual, the FS was given to me so I don't have instructions about the lessons etc.

As far as the Astronauts are concerned, I don't think it matters what time it is when you leave Earth. It would be more for the benefit of 'Mission Control' and schedules etc. So whatever is convenient would work well enough.

Hey Polyn. I think you're going to win next years Competition with that Signature. I think it's GGRREEAATT.

I'm not into modern aircraft much at all, but I do recognise and love my F16.  Grin Wink


I agree they probably just use what is practicle.  And arent space missions taken off 0:00 i.e. Liftoff and then amount of time after that? ? ? I don't know. . .

Thanx Professor for the signature comment . .  I love it!
 
Back to top 
IP Logged
 
Reply #31 - Sep 9th, 2003 at 11:08am
Oso   Ex Member

 
Quote:
But light exerts no force so it doesnt have a mass??


Read up on solar (light) sails for interplanatery travel. It does have a force, albeit small. A few kilometer diameter sail could have a spacecraft going the biggest part of the speed of light in a few years.
 
Back to top 
IP Logged
 
Reply #32 - Sep 10th, 2003 at 12:44am

Professor Brensec   Offline
Colonel
Can't you give me a couple
more inches, Adam?
SYDNEY - AUSTRALIA

Gender: male
 Posts: 2955
 *****
 
Quote:
Read up on solar (light) sails for interplanatery travel. It does have a force, albeit small. A few kilometer diameter sail could have a spacecraft going the biggest part of the speed of light in a few years.


Very true. I'm aware of these devices. I don't know if there has ever been one used or not, probably not.

But being an avid Trekkie, it's something that has featured in a couple of the later series. It is apparently a proven phenomena that light does exert a force, not unlike a light breeze, in the vaccuum of space. After all light consists of 'particles' that are moving. That being the case, they could cause movement if harnessed.  Grin Grin Wink
 
...&&...&&http://www.ra.online-plus.biz&&&&&&I cried because I had no shoes - until I saw a man who had no feet.&&&&Dell Dimension 8100 - Intel P4 1.7 Gb - 512 RD Ram - nVidia GeForce 128 mb FX5200.
Back to top 
IP Logged
 
Reply #33 - Sep 10th, 2003 at 1:36am

BFMF   Offline
Colonel
Pacific Northwest

Gender: male
 Posts: 19820
 *****
 
So your saying my flashlight does nothing but shoot out particles???
 
Back to top 
IP Logged
 
Reply #34 - Sep 10th, 2003 at 1:38am

stormy   Offline
Colonel
BC Canada Vancouver Island

Gender: female
 Posts: 1615
 *****
 
lol Andrew..  Grin Grin Grin
 
...
&&
Women Rule!!!!!!need I say more!!!!!!!
&&
Back to top 
IP Logged
 
Reply #35 - Sep 10th, 2003 at 2:58am

Professor Brensec   Offline
Colonel
Can't you give me a couple
more inches, Adam?
SYDNEY - AUSTRALIA

Gender: male
 Posts: 2955
 *****
 
Quote:
So your saying my flashlight does nothing but shoot out particles???


Apparently so mate. I'm not really that well up on light and the composition of same, but I'm led to believe it is a combination of rays or waves and particles.
I'm not sure, other than to say that it dose have 'mass' of some sort.

I'll have a read up on it and let you know. I'm interested myself anyway.  Grin Grin Wink
 
...&&...&&http://www.ra.online-plus.biz&&&&&&I cried because I had no shoes - until I saw a man who had no feet.&&&&Dell Dimension 8100 - Intel P4 1.7 Gb - 512 RD Ram - nVidia GeForce 128 mb FX5200.
Back to top 
IP Logged
 
Reply #36 - Sep 10th, 2003 at 3:04am

Rifleman   Offline
Colonel
" Full size A/C are just
overgrown models ! "
Tropical island in the Pacific

Posts: 6622
 *****
 
Quote:
It makes sense that UTC time is used on antarctica, but why wasn't it used by astronauts on the moon......???




The time used on Lunar exploration was "MET", if my memory serves me well...... ....it was much more convenient for them to start the mission clock on launch and stop it at splashdown..... 8)

Mission Elapsed Time              e.g.    T+ 49 Hrs 32 Secs
 
...
Back to top 
IP Logged
 
Reply #37 - Sep 10th, 2003 at 3:14am

Polynomial   Offline
Colonel
Health is merely the slowest
possible way to die.
Brisbane, Australia

Gender: male
 Posts: 1951
 *****
 
The way to look at light though is this:

Some ways it can be explained as a wave and others as a particle and even sometimes as a wave and a particle at the same time.

Solar sails sound expensive and very impracticle.

I still struggle to understand the particle theory of light, if it is a particle - why doesnt the glass in front of lights, or as Andrew says in your flashlight stop the particles escaping?  But then the French scientist De Broglie introduced the revolutionary theory of Matter Waves, because it was observed that while light obeyed both wave and particle theory, matter (i.e. stuff u can see down to electrons and particles) obey wave laws.  Believe it or not, when you throw a tennis ball it moves with wave motion.  This is called wave-particle duality and it is a very complecated branch of physics but it nonetheless is very fascinating.

Don't you just lover pondering the questions of the universe?!?!
 
Back to top 
IP Logged
 
Reply #38 - Sep 10th, 2003 at 3:15am

Professor Brensec   Offline
Colonel
Can't you give me a couple
more inches, Adam?
SYDNEY - AUSTRALIA

Gender: male
 Posts: 2955
 *****
 
Here you go - a quick explaination about the difference between Solar light and Solar wind. Also the difference between Solar Sails and Solar cells.
Plus a mention of 'photons' which are 'light particles'.

Quote:
Solar sailing is a method of converting light energy from the sun into a source of propulsion for spacecraft. In essence, a solar sail is a giant mirror that reflects sunlight in order to transfer the momentum from light particles (photons) to the object one is interested in propelling. Since the phrase "solar sails" is often confused with "solar cells", which is a technology for converting solar light into electrical energy, we will use the term "light sail" for the purpose of this discussion.


...
 
...&&...&&http://www.ra.online-plus.biz&&&&&&I cried because I had no shoes - until I saw a man who had no feet.&&&&Dell Dimension 8100 - Intel P4 1.7 Gb - 512 RD Ram - nVidia GeForce 128 mb FX5200.
Back to top 
IP Logged
 
Reply #39 - Sep 10th, 2003 at 3:17am

Polynomial   Offline
Colonel
Health is merely the slowest
possible way to die.
Brisbane, Australia

Gender: male
 Posts: 1951
 *****
 
Nice clear explanation Professor!
 
Back to top 
IP Logged
 
Reply #40 - Sep 11th, 2003 at 9:35am

Travis   Offline
Colonel
Cannot find REALITY.SYS.
Universe halted.
Dripping Springs, TX

Gender: male
 Posts: 4515
 *****
 
Just FYI--to date, no solar (okay, LIGHT) sail has been built, nor is there any forseeable time that one will be built.  Someone would first have to figure out some way to keep the other particles of space matter (atoms, flying at ~160 mps, or 1/1000th light speed) from blasting holes in the sail.  One marble-sized piece of rock travelling at that speed could completely destroy a light sail.  And the chances of something like that hitting a sail so big (many square kilometers) is very high.

I don't know how this conversation went from time at the poles to space travel, but there are many other, better ways to get from star to star.
 
...
Back to top 
IP Logged
 
Reply #41 - Sep 11th, 2003 at 9:49am

Scottler   Offline
Colonel
Albany, New York USA

Gender: male
 Posts: 5989
 *****
 
I agree Ender Baron.  In fact, in Hollywood, they sell maps, and will even take you on tours!
 
Great edit, Bob.&&&&&&Google it. &&&&www.google.com
Back to top 
IP Logged
 
Reply #42 - Sep 11th, 2003 at 9:52am

Travis   Offline
Colonel
Cannot find REALITY.SYS.
Universe halted.
Dripping Springs, TX

Gender: male
 Posts: 4515
 *****
 
LMAO!!  Your wit continues to catch me offguard, Scott! Grin
 
...
Back to top 
IP Logged
 
Reply #43 - Sep 11th, 2003 at 10:05am

Scottler   Offline
Colonel
Albany, New York USA

Gender: male
 Posts: 5989
 *****
 
Glad to be of some use.  Wink
 
Great edit, Bob.&&&&&&Google it. &&&&www.google.com
Back to top 
IP Logged
 
Reply #44 - Sep 11th, 2003 at 9:13pm

Rifleman   Offline
Colonel
" Full size A/C are just
overgrown models ! "
Tropical island in the Pacific

Posts: 6622
 *****
 
And here I was going to offer up the writings of Zephram Cochrane...........as a means of getting from star to star.........
 
...
Back to top 
IP Logged
 
Pages: 1 2 3 4 5 6
Send Topic Print
‹ Previous Topic | Next Topic ›
  « Home ‹ Board Top of this page

Simviation Forum » Powered by YaBB 2.5 AE!
YaBB Forum Software © 2000-2010. All Rights Reserved.

Valid RSS Valid XHTML Valid CSS Powered by Perl Source Forge