Science & Mathematics - 25 October 2006

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Tell me the best things which can not pass the electricity through it?

2006-10-25 00:48:51 · 10 answers · asked by Anonymous in Physics

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i had completed my P.G(organic chemistry) in july 2006 which field is better to me for job?

2006-10-25 00:44:01 · 3 answers · asked by Raju 1 in Chemistry

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Bert runs a course at 9.2 m/s while Brenda rides her bikes over the same distance at an average of 29 km/h.?

Who will finish the course first?
Pls my Homework must be done on friday!
i'm not good at this!!!!!!

2006-10-25 00:29:26 · 3 answers · asked by Anonymous in Physics

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Can carbon dioxide and hydrogen be combined to form alcohol?

Consider a small dia. wind mill turning a 12 volt dynamo or alternator producing 12volt DC feeding an electrolytic cell to produce hydrogen and oxygen. The oxygen would be allowed to vent to atmosphere. Could the hydrogen be piped to a reaction vessel and be induced to react with carbon dioxide. If my 50yo Chemistry A level is correctly remembered.
6H2 +4CO2 =2C2H5(OH) +3O2
Whilst this balances, I don’t know is if such a reaction is possible and if it is, what conditions and catalysts are required to produce it. It may require large scale units and high pressures/temperatures to react. It may require copious amounts of energy which renders the whole exercise fruitless.
The carbon dioxide could be the product of fermentation of organic matter so the process would be carbon neutral and renewable.
I would like to hope that it could be designed so there would be very little free hydrogen within the reaction vessel to cause hazard.
Could it be possible to produce the bigger chain al

2006-10-25 00:26:43 · 8 answers · asked by Paul G 1 in Chemistry

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Greatest integer function?

We define a function [x] (Greatest Integer Function) as
f(x) = [x] =
{ n, n ≤ x < n + 1, n is an integer

I correctly define the integral ∫[x]dx as
∫[x]dx =
{ nx - (n² + n)/2, n ≤ x < n + 1, n is an integer

Now, how can you explain the constant quantity -(n² + n)/2? Where does it come from?

^_^
thanks!^_^
...easy...
^_^

2006-10-25 00:24:53 · 2 answers · asked by kevin! 5 in Mathematics

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