Physics - August 2006

for all examples of wave energy except photons (that i am aware of) there is always a medium present yet light has observable frequency and wavelength characteristics so.. is "Dark Matter"
possibly the medium?

2006-08-06 11:23:32 · 5 answers · asked by exitwound 1

Heat Death refers to the supposed inevitable distribution of thermal energy throughout the universe (assuming no multiverses). So all chemical, electrical, mechanical (etc) energy will have been converted to thermal energy (commonly known as heat). But, since matter and energy are interchangeable under certain circumstances, does that mean all matter will have to undergo conversion to heat?

2006-08-06 11:20:13 · 1 answers · asked by N G 2

2006-08-06 10:38:53 · 14 answers · asked by paullus 2

2006-08-06 10:18:33 · 6 answers · asked by Anonymous

2006-08-06 10:14:12 · 6 answers · asked by Irfan S 1

I’m fairly familiar with the standard twin paradox, but I’ve never seen the paradox adequately resolved for a closed universe. Closed in the sense that if you travel in a fixed direction long enough, you’ll end up where you started; like if space were the surface of a hyper-sphere.

Anyone know how to resolve it? What would happen if two twins set out in opposite directions and (assuming the universe is closed) they ran into each other again? Calculations made by either of them would yield that the other should be older and they could ask each other who was the younger via radio transmissions without necessarily stopping.

I’ve seen one person resolve it (in “American Mathematical Monthly”) by saying that there IS a preferred reference frame in the universe, but that kind of flies in the face of one of the basic postulates of Relativity.

(Just FYI this stumped my physics professor, but he specializes in Particle Physics not Cosmology)

2006-08-06 10:12:24 · 2 answers · asked by Anonymous

2006-08-06 10:04:05 · 15 answers · asked by dhurandaru 1

2006-08-06 09:28:15 · 5 answers · asked by Storm 1

2006-08-06 09:13:41 · 8 answers · asked by cool m 1

Give me a practical example of Virtual and real image .

2006-08-06 07:59:09 · 12 answers · asked by star123 2

why cant we control fusion reactions? like those in a H bomb in the same manor we can control fission reactions, why is a fusion reaction totally uncontrollable?

2006-08-06 07:57:06 · 24 answers · asked by Anonymous

In lami's theorem,What does "three equilibrium forces" means?
Why this theorem for three forces?Why not for "4,5 or another number" of forces?

2006-08-06 07:29:03 · 4 answers · asked by star123 2

2006-08-06 07:21:41 · 11 answers · asked by catty 4

2006-08-06 07:02:43 · 6 answers · asked by ghost 1

Why virtual image can not project on a screen?give answer with explaination.

2006-08-06 06:41:00 · 4 answers · asked by star123 2

2006-08-06 05:59:25 · 9 answers · asked by elaine b 2

2006-08-06 05:53:18 · 1 answers · asked by goring 6

Einstein has different laws of cause of motion? what are the differences?

2006-08-06 05:50:51 · 2 answers · asked by goring 6

Why real image only creates in concave mirror and convex lens?

2006-08-06 05:41:53 · 4 answers · asked by star123 2

okay its been ages since i did quantum physics so i may be totally wrong but isnt one of the thoeries that light is delivered in 'packets' and therefore has a mass (on the sub atomic level), so is in fact a particle acting as a wave? but if light has mass then according to einstein it could never attain light speed because its mass would become infinate? I could be totally wrong and if i am id appreciate someone simply telling me rather than saying "your so stupid, etc etc".. lol sorry it bugs me (i mean if i was a quantum physicist i wouldnt be asking would i?)

2006-08-06 04:22:58 · 25 answers · asked by Anonymous

specifically what causes this force, no answers like mass or the like i mean details, inter atomic forces is not a valid answer either unless you explain what that is (to my knowledge noone knows but i could be wrong)

2006-08-06 04:18:03 · 41 answers · asked by Anonymous

2006-08-06 03:21:36 · 15 answers · asked by auztik 2

2006-08-06 01:52:11 · 4 answers · asked by Abhilash 1

no matter how tightly the line is stretched it always sags a little at the center. why?

2006-08-06 00:25:13 · 10 answers · asked by charyz 1

I had just read that the closest galaxy to ours is 1.6 million light years away and that there are something like 200 billions galaxies. Is this correct information? Also, about how many stars are there in the universe? Given the age of the universe, how did matter reach such distances traveling slower than the speed of light? What's the fastest speed the furthest galaxy had to travel to reach it's current point in space?

2006-08-06 00:04:23 · 8 answers · asked by aaron g 2

Physics

2006-08-06 00:02:54 · 6 answers · asked by zain_mohd89 1

please explain how to find out how many elememts are there in each period.any law?
I read that the number of elements is equal to the energy level of that period.HOW?

2006-08-06 00:01:56 · 7 answers · asked by Anonymous

it means wat happened 2 their energy?

2006-08-05 23:23:29 · 3 answers · asked by Anonymous

this is a science question on advanced physics

2006-08-05 22:10:23 · 14 answers · asked by eric b 1

it says "each action has an equal and opposite reaction" so...if a truck and a cycle collide....will the force exerted by the truck on the cycle be equal to the force exerted by the cycle on the truck?

2006-08-05 22:06:41 · 19 answers · asked by asdfgf;lkjhj 3