Cloud Definition and 241 Threads

Homework Statement An optically thin cloud at temperature T radiates power P_{\nu} per unit volume. Find an expression for the cloud's brightness I_{\nu} as a function of distance from the centre of the cloud in the case where: (a) the cloud is a cube of side d (b) the cloud is a sphere...

Hi, Can anybody explain me what is Keyword Cloud. Regards, Suganya EasyCalculation ToFocus

Dr Steinn Sigurðsson (Penn State) has been reporting findings announced at the Confererence on Extreme Solar Systems on his blog http://scienceblogs.com/catdynamics/2007/06/extreme_solar_systems_v_the_sa.php but amongst all the interesting discoveries is this idea raised by planetary dynamicist...

Please help me! Homework Statement A cubic centimeter in a typical cumulus cloud contains 50 to 500 water drops, which have a typical radius of 10 µm. For that range, give the lower value and the higher value, respectively, for the following. (a) How many cubic meters of water are in a...

I was wondering if you excite a inner electron in a multi electron atom to a outer cloud what is the effect on filling the hole. So if you excite a inner electron and it jumps to a open space in the valance/conduction cloud (so it does not leave the atom) in the ~10^9 second of excitement...

I was wondering if there is a way to align an atoms electron cloud-orbit/probability of location to one side of an electron. For example the probability of the electron being on the closet side or being in a regular area at a regular time. i.e. regular orbit area, and or keeping the electrons on...

Homework Statement The Electric field between a cloud and the ground is 1.0X10^6 N/C. If 35C of charge is transferred to the ground (lightning bolt) over a distance of 2.3km, what is the voltage of the cloud. Homework Equations q=mg/E? The Attempt at a Solution I don't have the...

In an edition of the New Scientist it says: "The streams of water vapour and ice particles that form behind an aircraft, called contrails, are known to create cirrus clouds. These clouds can trap heat radiating from the Earth's surface and thus add to global warming" How big an addition to...

I don't believe the cloud formation by particles from space idea because why would they be doing this now (we'd have to be unlucky given geological timescales) and why isn't there evidence of this in the past.

hi... a rocket of mass M is flying through a dust cloud the cloud has a density of P. the rocket's cross section is A. every dusticle the rocket colides with becomes permenantly attached. the rocket is ejecting material (as a propellant) at the same rate that it assimilates it. the speed of...

What IS this? Yesterday I was driving home from school when I saw that in the clouds there was what seemed to look like a portion of a rainbow :confused: :confused: I thought it was weird, so I took a picture of it while driving, with my cell phone, so it's not the best quality :redface...

I'm conducting a cloud chamber experiment using: Jar (black lid) Felt(black) Methylated Spirits (96% ethanol) Water Cobalt 60 Dry Ice Concentration about 50-50 with the spirits and water then soaked the felt. Using a projector which produces heat to main a temperature gradient. So far...

I want to build a cloud chamber. I have tried one approach for which I found directions online. Unfortunately it didn't work out for me. In short, I used an empty pickle jar with felt glued into the bottom of the jar. I poured in 91% Isopropyl alcohol to saturate the felt. I screwed the...

http://arxiv.org/abs/astro-ph/0505036 http://www.universetoday.com/2006/06/12/gigantic-ball-of-fire-discovered/ the popular news item says "gigantic-ball-of-fire-discovered" heh heh it is a gas cloud in the cluster Abell 3266 which is hot enough to be observed in Xray wavelengths----ie...

On a recent thread about cloud chambers, a question popped into my head. My knowledge of cloud chambers is that one can see the "path" of certain elementary particles as they pass through the chamber. If, say, we had an electron passing through the chamber, do we have to assume that the...

As I understand this, if the double slit experiment is performed in a cloud chamber the interference pattern of the electrons disappear and tracks are seen within the vapour. Does the interference pattern disappear because by the process of observation (permitted by the cloud chamber) we have...

"PLANET-DISSOLVING DUST CLOUD IS HEADED TOWARD EARTH! Monday September 12, 2005 By MIKE FOSTER CAMBRIDGE, Mass. -- Scared-stiff astronomers have detected a mysterious mass they've dubbed a "chaos cloud" that dissolves everything in its path, including comets, asteroids, planets and...

How big would a spherical cloud of molecular nitrogen at a uniformed pressure of 1 atm (1x10^5 Pascal) and a temperature of 300 K have to be for it to collapse under the mutual gravitational attraction of its molecules? i.e., What is the critical radius for Jean's collapse of a nitrogen cloud...

Does anyone know anything about this? http://tv.yahoo.com/news/wwn/20050912/112653720001.html I'd love to hear what people who know what they're talking about, physics-wise, have to say about this. \phi The Rev

Hello everyone, in the 1910's Wilson build the very first cloud chamber based on watervapour and adiabatic decompression. With this device you can see radiation from radioactive materials and cosmic rays. For a description see...

I have read numerous books that describe the formation of a solar system from a cloud of gas. They state that as the gas contracts it rotates and as it rotates it flattens out into a disk. I do not understand why the gas molecules start to rotate, how the gas molecules decide which way they are...

Hello everyone, I'm a physics/astronomy noob, actually I don’t even begin my curricula till later this 2006.Yes, the credibility of this source is well umm… it’s a tabloid! But my friend who studies astronomy sent me this and this is the debunking thread afterall. :biggrin...

Does anybody know where I would be able to view a video of a wilson cloud chamber being used? I need to view one for homework. cheers

This is a problem that has been giving me trouble, wondering if I could get some input: A space probe of mass m is dropped into a previously unexplored spherical cloud of gas and dust, and accelerates toward the center of the cloud under the influence of the cloud’s gravity. Measurements...

Hi I have those 2 problems: A typical cloud contains droplets of water with an average radius of .5 * 10^-4m. how many droplets are needed for a cloud that provides a rainfall of .5 cm. ( the answer must be 1*10^21 droplets) for this second problem I don't know how to find two...

Why are the bottoms of large clouds flat?

Hello! here is one question which I still donno how to solve: A thunder cloud with a large flat square base measuring 3000m x 3000m passes over an area on level ground. Assuming the cloud carries a total charge of 40C which is spread evenly over its base and is at a height of 0.5 km above the...

A few quotes from various sources suggest there is quite a bit of material in the Oort Cloud, maybe enough to threaten interstellar space travel: “The Oort cloud is an immense spherical cloud surrounding the planetary system and extending approximately 3 light years, about 30 trillion...

So I need to build a cloud chamber for a physics project and I have no idea where to start. I need it to be simple but not too simple so that it actually looked like I put some effort into it. Any help would be greatly greatly appreciated. I am very very desperate.

Ahad's virtual bridge might have to charge a toll fee: http://www.astroscience.org/abdul-ahad/firstarktoalphacentauri/interstellar-propulsion.htm :!)

http://science.nasa.gov/headlines/y2004/27sep_shieldsup.htm?aol667632 At the above link, it appears there is a high temperature cloud of gas has been colliding with the solar system. What could keep a cloud of gas at such a high temperature in the interstellar medium?

Ok i am trying to program a simulation of an atomic explosion that would display the resulting mushroom cloud. in order to do this i need to understand, step by step, what forces occur after the actual nuclear reaction that result in producing the actual mushroom cloud and the other actions that...

Here are the reports on the wire: http://story.news.yahoo.com/news?tmpl=story&e=4&u=/ap/20040912/ap_on_re_as/nkorea_explosion http://story.news.yahoo.com/news?tmpl=story&e=4&u=/ap/20040912/ap_on_re_as/nkorea_explosion Thoughts? Ideas? Anything? I guess GW can strike N. Korea off...

First post and let me just say that after viewing this forums rules and it's warning system, I very much appreciate your efforts to keep this area within a realm of discussion instead of name-calling like you see on the usenet groups. Ok, now that cheesy statement is over let me get on with my...

can anyone tell me if the existence of the Oort Cloud has been confirmed, or is it still hypothetical?

!Artificial rain cloud machine created by Israel scientists! Yesterday, while seeing spanish news, I was seeing are report of Israel scientists created a machine that produces artificial clouds with rain!The machine is a clear tube with an apparatus at the bottom and closed at the top...

[?] I'm thinking of building a simple cloud chamber in order to detect small particles such as muons, neutrinos, and the like. I have read some handbooks but I would be grateful if someone could lend me a hand by providing some instructions. I only have three months to prepare this so I need the...

Has anyone here read K.C. Cole's book titled, First You Make a Cloud? If so, did you like it?

Has anyone heard the statement that a cloud of electrons neither reflects, transmits or absorbs any light therefore making it "invisiable"? Is this true? ~Uraniumbob:smile:

Something I've thought about before but never asked anybody...The existence of short-period comets is a problem if one believes the solar system is 4 billion years old, because obviously after that length of time all of the short-period comets would have disintegrated. So, we need a way of...

Is fog basically a cloud except close to the ground