Science & Mathematics - 7 October 2006

2006-10-07 20:50:46 · 3 answers · asked by ly k 2 in Physics

Please explain me logically i dont need definitions and its theorems tell me what exactly it is ???? please help

2006-10-07 20:45:48 · 3 answers · asked by Anonymous in Physics

2006-10-07 20:43:36 · 6 answers · asked by Anonymous in Mathematics

2006-10-07 20:40:34 · 8 answers · asked by Anonymous in Mathematics

How does the movent work? Why does it open and close? What causes it?

2006-10-07 20:39:36 · 1 answers · asked by Marianne N 2 in Biology

2006-10-07 20:37:20 · 3 answers · asked by SmoOth 1 in Chemistry

2006-10-07 20:35:56 · 1 answers · asked by SmoOth 1 in Chemistry

Once you have a definition, then fully define it's operational structure.

2006-10-07 20:32:24 · 4 answers · asked by joewalkalone 1 in Physics

2006-10-07 20:32:22 · 6 answers · asked by Jimmy H 4 in Zoology

I'm having problem with this question... Hopefully someone can help? It goes like this:

A particular uranium alloy has a density of 18.75 g/cm^3. What volume if occupied by a critical mass of 49 kg of this alloy? [I calculated 2613.3 cm^3.] The critical mass can be decreased to 16kg if the alloy is surrounded by a layer of natural uranium (which acts as a neutron reflector). What is the volume of the smaller mass?

Actually, I'm a little confused here as to whether the density of the alloy changes when it is surrounded by a neutron reflector. Can anyone help me? Thanks.

2006-10-07 20:25:01 · 3 answers · asked by silverwhiskers 2 in Chemistry

Hint: Second order linear equation..
Comment: Not a great problem!!

2006-10-07 20:25:00 · 8 answers · asked by debasish2000 1 in Mathematics

Theorem: 3=4
Proof:

Suppose:
a + b = c

This can also be written as:
4a - 3a + 4b - 3b = 4c - 3c

After reorganizing:
4a + 4b - 4c = 3a + 3b - 3c

Take the constants out of the brackets:
4 * (a+b-c) = 3 * (a+b-c)

Remove the same term left and right:
4 = 3

2006-10-07 20:14:15 · 14 answers · asked by Anonymous in Mathematics

How do I go about finding the mass of precipitate that forms from a solution mixture? All I'm given is the volume, molarity, and formula for two elements.

2006-10-07 20:14:05 · 4 answers · asked by Jason He 2 in Chemistry

Hint: Use Clairaut's Equational form
Comment: Please don't think me as a student.. I'm a Post graduate in Management (Graduate in terms of US educational system) with Economics and Mathematics as my background subjects.. I give these problems for refreshing my brain in the weekends after a long week of monotonous office job as well as to know many things from you also... Exchange of ideas what I mean.
:)

2006-10-07 20:12:19 · 3 answers · asked by debasish2000 1 in Mathematics

2006-10-07 20:03:07 · 1 answers · asked by hamid 1 in Physics

How did these come about? I know they wernt formed into formations so who decided to see them as formations? Also who decided on the names?

2006-10-07 19:57:33 · 6 answers · asked by vampire_o3 3 in Astronomy & Space

ways animals and plants relate in the forest, and the competition that occurs there.

2006-10-07 19:52:54 · 1 answers · asked by rapunzel 1 in Zoology

2006-10-07 19:51:30 · 9 answers · asked by ronit s 1 in Physics

I'm currently taking Geometry in 8th grade. (I skipped PreAlgebra)

Since the beginning of school, I took 4 tests so far.

When I test with the other subjects (History, English, and Science) I do really well, but math is the only problem I have...

Yet every math test I took, I knew how to do the math, but I always end up making little mistakes (as my math teacher tells me). And everytime I get the test back, I would always go Grr! I knew how to do this!

Anyone have any tips for math test taking?

I'm always the 2nd-to-last/last person to finish... & I'm always nervous while taking the math tests and everyone in my class is very competitive (so that doesn't help). Plus everyone exspects me to be SUPER intelligent and I don't want to disappoint anyone, but I recently have (because of my math grade). This was the first time I had ever disappointed my parents..

This has been troubling me for 2 weeks already :( and I can't stop worrying if I'm going to fail the next test too

2006-10-07 19:49:38 · 16 answers · asked by Royale 3 in Mathematics

2006-10-07 19:48:53 · 8 answers · asked by Raj from Nepal 1 in Zoology

While reading an article on the adsorbtion and desorbtion of Pu in clay based sediments, the article mentioned that Pu-241 demonstrated an alpha decay. The article then discounted the presence of Am-241 parented by Pu-241, suggesting a beta-minus decay.
A quick internet search found reference to both alpha and beta-minus decays, but not suggesting both.
So which is it?

Ken

2006-10-07 19:48:33 · 3 answers · asked by Ken B 3 in Chemistry

2006-10-07 19:45:44 · 5 answers · asked by adi 1 in Chemistry

2006-10-07 19:45:42 · 3 answers · asked by eswar rao 1 in Physics

2006-10-07 19:43:25 · 1 answers · asked by Anonymous in Medicine

(physics) The time required for half of the nuclei in a sample of a specific isotope to undergo radioactive decay.
(chemistry) In a chemical reaction, the time required for the concentration of a reactant to fall from a chosen value to half that value.
(medicine) The time it takes for a substance (drug, radioactive nuclide, or other) to lose half of its pharmacologic, physiologic, or radiologic activity. Year introduced in w:MeSH: 1974(1971)
(culture) The time it takes for an idea or a fashion to lose half of its influential power. "Most books of scholarship have surprisingly short intellectual half-lives during which they make a difference" (Robert Ackerman, 1991. Introduction to Jane Ellen Harrison's Prolegomena to the Study of Greek Religion (1903).






Foreign Terms:
Arabic: عمر النصف
Catalan: període de semidesintegració, període radioactiu
Chinese: 半衰期
Czech: poločas rozpadu
Danish: halveringstid
Dutch: halfwaardetijd, halveringstijd
Esperanto: duon

2006-10-07 19:40:46 · 2 answers · asked by destiny 1 in Other - Science

heard this somewhere, not sure if i spelt cesium right but its a substance that when put in water causes an explosion. all answers appreciated thanks.

2006-10-07 19:36:25 · 3 answers · asked by Anonymous in Chemistry

How long, in seconds, does it take an automobile traveling 50.0 km/h to become even with a car that is traveling in another lane at 40.0 km/h if the cars' front bumpers are initially 122 m apart?

2006-10-07 19:33:43 · 3 answers · asked by Fanjame 1 in Mathematics

a) 4ft, b) 32ft,c)9ft, d)8ft?

and also an angle x measure 39 degrees more than angle y. translate into symbols.

2006-10-07 19:30:14 · 10 answers · asked by gladdo19 1 in Mathematics

I need something for my science project. Its an investigatory project. And i cant think of a topic! Please help. Something simple yet complex. Thanks! Related to physics or chemistry if possible.

2006-10-07 19:22:04 · 10 answers · asked by Gelopy 1 in Physics

2(7x)=-70
is it -5?

2006-10-07 19:19:56 · 11 answers · asked by gladdo19 1 in Mathematics