Jacques

I thinked a little bit more and I think if you make one of the output vanish the other will also. An other thing I thaught was that it is impossible to have two different photon have exactly the same axe, so after some time the two photons will split appart. If we place a detector on one output will see a concentric cercle patern of light and dark area. The question now is does any photons hitted the dark area ? A probability patern only ? Or two photons 180 out of phase hitting an electron at the same time has no effect ?

50% is reflected and 50% goes throught. The output is two beams each composed of 50% from laser A and 50% from laser B. By moving one of the laser you can make one of the output beam vanish...

With two lasers and a half silvered mirror.

No I live in Canada ! strange coincidence ! What does your teacher answered you ?

Hi I have a question bugging me since yesterday. If I combine two 180 degree phased out photons, the photons will interfere leaving nothing... By nothing I mean "not able to be detected". My question: where is the energy of the photons ? Is it possible to seperate the two photons ? Thanks Jacques

Hi I have a heat pump for my house. The efficienty depend on the difference of temperature between inside and outside. When the outside temperature is -12 C the ratio of extracted energy to invested energy is 1. Over -12 C I extract more energy than what I invest. For 1 watt of energy used to run the heat pump, I extract more than 1 watt of heat. Below -12 C the oil heating kicks in and the heat pump turned off. During summer, the same heat pump is used in reverse to cool down my house

Hi all This weekend a man made satellite will crash on the moon surface and the flash created might be seen with a backyard telescope. Western united state are favored. http://sci.esa.int/science-e/www/area/index.cfm?fareaid=98 I think that may interest some people here !

If I remember well, Electronic flash use capacitor bank. The capacitor bank use a lot of capacitor on a circuit made to charge the capacitors in parallele and discharge them in serie. For example if you have 100 capacitor and apply 6V to change them in parallele and hook them in serie you will end up with 600V . The electronic circuit is doing all the job of charging in parallele and discharging in serie.

You would be suprised how hard it is to break an egg! Specially when the pressure is well distributed. Press an egg between the two palm of your hands.

Analysing the problem I think I found an original solution that doesn't involve any padding. The trajectory can be decomposed in 3 : the lauch, the "free" flight and the reception in the cup. The 3rd step is the one how cause the most problem and from the solution of that step will depend the 2 others. The key concept is acceleration: we need to minimize accelerations so the egg won't break. We can decompose the reception in a vertical and an horizontal components. Vertical: how do we minimize the vertical acceleration ? By reducing to a minimum the height of the fall. During the free flight the vertical speed is decreasing until zero and after start increasing toward the earth. So the egg must pass the rim of the cup when the vertical speed is zero at the top of the free fligth trajectory. That the first part of the solution.(see Vertical on the drawing) Horizontal: how do we minimize the horizontal acceleration ? By minimazing the horizontal speed and maximizing the time or distance the acceleration take place.Minimizing the horizontal speed mean increasing the free flight time. The longer time it take to cross the 2 foots the slower will be the horizontal speed. (see under Horizontal VH1 and VH2 velocitys) In the drawing egg B will decelerate under the smallest distance, but egg A will have the radius of the cup to decelerate. So the best entry point is on the side of the cup. Also by entering by the side the deceleration can be converted in the rotation of the egg. I suggest sending the egg with the rotation axis to the vertical. For the launcher it is easy to find a lenght that will enable any flight speed. You must adjust for the form of the egg and the form of the cup to make sure that the center of mass of the egg is below the rim when the contact occur. May be by launching a rotating egg can help ??? Give some new if that analys helped you.

Mini-Comets Approaching Earth 03.24.2006 A cometary "string-of-pearls" will fly past Earth in May 2006 giving astronomers a fantastic view of a dying comet. http://science.nasa.gov/headlines/y2006/24mar_73p.htm

I saw someone in Montreal during the festival "Just for Laught" harnested to a big ballon (around 15 feet diameter) and was jumping like an angel in the street ! It was very strange and space out !

It's a question

I would say strong evidence from the supernovae survey like you said. Galaxies can recess faster than the speed of light. Recession is not a motion of the galaxies themself, but more an expansion of space between them (taht what I was told, maybe someone can confirm that?)

Twins A and B in space. A accelerate to the left and B accelerate to the right. ??? 1) A age faster than B 2) B age faster than A 3) A and B age at the same rate 4) 1) and 2)

From what I read here there is no solution to the twin paradox.

http://www.spaceweather.com/eclipses/gallery_14mar06.html

LUNAR ECLIPSE: When the full moon rises on Tuesday evening, March 14th, you might notice something odd--a pale shadow darkening the moon's southern hemisphere. That is the shadow of Earth, and if you can see it, you've spotted a penumbral lunar eclipse. http://spaceweather.com/

Can I say that Einstein priciple of equivalence betwen gravity and and accelerated frame is false ? Gravity is not equivalent to an accelerated frame. In the ascencor the acceleration is causing a rate of rate change in time. AS the space ship speed up thee relativitic time dilatation is increasing. In a gravitational acceleration the the change of rate is constant. I am conscios that saying something like that will make me look like a freak but think about it. Thanks

Thanks for taking the time to answer me. Then, what is the cause of change in clock rate when we change reference frame ? You resolve the twin paradox by answering the question "Is it A or B clock who run slow ?" by "the clock who run slow is the clock who accelerated". I have a question: At a space staion far far away where the gravity field is neglictable (around 0) a space ship have is clock sychronized with the clock of the station. The 2 clock run at the same rate. On January 1st 3000 the spaceship leave the space station and accelerate to .86 C and take 1 years to get to that speed. What will the clock on the spaceship indicate ?

ASTEROID FLYBY: On Monday, March 6th, asteroid 2000 PN9 will fly past Earth. There's no danger of a collision with the mile-wide space rock, but it will be close enough (2 million miles) and bright enough (12th magnitude) for amateur astronomers to photograph using big backyard telescopes and CCD cameras: ephemeris. http://spaceweather.com/

My point is that velocity is not the cause of the change in rate of the clock. At constant speed the rate of the clock doesn't change. At v=.86 the rate of the clock is .5 and will always be .5 as long as v=.86 You are speaking of rate, I am speaking of change of rate. Can you reread my post and I think you will understand what I want to tell Thanks

OK but still it is not the speed that cause the clock to run slower. It is the acceleration who slows the clock. The rate of the clock stay the same at constant speed. Are you sure of that ? Uranus is a lot more massive than earth, but have a bigger diameter. I think you would be crushed if you went on the surface of that planet but not 100% sure would need to do the calculation... and you said Don't you se a contradiction ?

Would it be more simple to say that acceleration slowdown the rate of clock ? Speed does not slow the rate of the clock. If true then gravity being an acceleration our clock on earth are all slowing down relative to a clock far far in space where gravity is weaker.

Norman I have problem following you and I don't understand what you are trying to say. Can you use less poetic sentence ?