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EDDIE51

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tali122

why are radiactive elements given half -lifes?

i assume also half life refers to how long the threat of radiation that remains but why are radiactive elements given half -lifes? what is the purpose of that rather than full life?
21:59 Mon 22nd Aug 20055 answers, last by Hamish 11:01 Wed 24th Aug 2005
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tali122

nothing can escape a black hole ?

it is said that nothing can escape a black hole and everything is sucked in - but far does an object have to be and get sucked in?
20:09 Sat 20th Aug 20056 answers, last by stevie21 00:11 Mon 22nd Aug 2005
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m_hurst

Lowering the PH of saline solution

We are a manufacturer of contact lenses and we make our own saline. We use the follwing mixture: <UL> <LI>410g Sodium Chloride</LI> <LI>98g Di Sodium Hydrogen...
12:56 Wed 17th Aug 200511 answers, last by Hamish 08:58 Fri 19th Aug 2005
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Mark154

Blue giants

Do any of you know anything about them or where I can find stuff about them online because I'm doing a project on them and dont know where to look for things?
15:36 Tue 09th Aug 20056 answers, last by EDDIE51 16:51 Sat 13th Aug 2005
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admarlow

Pencil Terminal Velocity

If I dropped a pencil from a building, how many stories would it take to reach terminal velocity?, what a pencil traveling at this speed be dangerous?
12:35 Tue 09th Aug 20053 answers, last by EDDIE51 17:31 Wed 10th Aug 2005
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allen

Chrome.

Apart from the price, what's the difference between cheap chrome-plated objects and 'real' chrome ones? What's the process of manufacture? I'm trying to buy some chrome 'grab rails' for my bathroom,...
13:05 Mon 01st Aug 20055 answers, last by allen 12:17 Wed 03rd Aug 2005

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