Science & Mathematics - 21 July 2007

One of the reactions that occurs in a blast furnace (where iron core is converted into cast iron) is that iron (III) is treated with carbon monoxide to produce elemental iron and carbon dioxide. Suppose that 1.64 x 10^3 kg of iron are obtained from a 2.62 x 10^3 kg of iron(III) oxide. Assuming that the reaction goes to completion (ie, no leftover iron(III) oxide) what is the percent purity of iron(III) oxide in the original sample?

2007-07-21 04:41:16 · 3 answers · asked by whazzup451 1 in Chemistry

A woman has two children whose blood types are as follows; 1st child is type O
2nd childs blood type is AB
What is the blood type of the mother?
A) IaIa, B) IaIb, C) Ibi, D) ii or E) Iai ?

2007-07-21 04:39:28 · 5 answers · asked by seabiscuit1954 1 in Biology

Why?

2007-07-21 04:37:44 · 8 answers · asked by Gama 2 in Physics

so if your using the weigh machine...and the machine reads in grams and you want liters........what is the conversion??

2007-07-21 04:37:40 · 8 answers · asked by Anonymous in Mathematics

Atomic mass=4.00260 u

2007-07-21 04:27:55 · 1 answers · asked by Tam 1 in Physics

In a document, what is the proper ettiquette to address or refer to a doctor? Dr. Joe Bloe or Joe Bloe, M.D.

2007-07-21 04:25:06 · 11 answers · asked by SR 1 in Medicine

Question 1:
In acute triangle ABC, segment AD is an altitude, the measure of angle ADB = 4x2 + 26, BD = 9x - 3, and DC = 6x +8. Find BC. Show all work to recieve credit.

Question 2:
Triangle PQR is a 30-60-90 triangle with right angle Q and segment PQ as the longer leg. Find the possible coordinates of R if P(2,6) and Q(2,-6). Show all work to receive credit.

Please help me do these. They are the last two questions I have to answer. Only serious answers please. THANKYOU!

2007-07-21 04:23:10 · 1 answers · asked by Anonymous in Mathematics

2007-07-21 04:21:50 · 14 answers · asked by risker4you 2 in Biology

2007-07-21 04:15:43 · 10 answers · asked by ikiv 1 in Astronomy & Space

a) The carbon dioxide of the atmosphere, being a nonmetallic oxide and acid anhydride, has a low solubulity in rain water but produces a slightly acidic solution. Write an equilibrium equation for the dissolution of carbon dioxide in water and identify the acid that is formed.

b) Calcium carbonate, the major component of limestone, is slightly soluble in water. Write an equilbrium equation showing the slight solubility of calcium carbonate in water.

c) Write a Bronsted equation for the weak acid formed in part a, showing how it produces hydronium ion in aqueous solution.

d) Using LeChateliers principle, explain how the weak acid formed in rainwater causes the dissolution of calcium carbonate. the consequence of this reaction contributes to the degree of hardness in underground and surface water supplies and also accounts for the formation of stalagmites and stalactites.

2007-07-21 04:12:36 · 2 answers · asked by Anonymous in Chemistry

gold in color when owner does so many good deeds. I saw one woman with the bracelet in gold color and another where it had turned brassy. Is there a more natural explanation?

2007-07-21 04:11:26 · 4 answers · asked by jlc 2 in Chemistry

Background- I am installing a MODBUS connection from a RTU, aTelvent 2300, to a DCS for set point control of generator output for ESCC AGC (automatic generation control). I am using Dymec multimode fiber transceivers to haul the RS232 from a Substation control house to the equipment room of the unit.

For test purposes, in the initial phases, I programmed an additional RTU and had good communication between the substation RTU and the test RTU that was simulating the DCS.

When the DCS was connected to the substation RTU the serial analyzer function built into the RTU displays the poll from the DCS as "FR FR FR FR FR FR FR". I know MODBUS protocol, so I don't really need an explanation of addressing, function codes, exceptions, ECT. I am wondering if RS 232 line analyzers normally display framing problems this way? What are some of the problems that would cause framing problems? Connection is 9600 8-1-none. Ideas welcome (DCS factory Rep who programmed DCS is on vacation in Hawaii).

2007-07-21 04:10:46 · 2 answers · asked by Jim M 2 in Engineering

2007-07-21 04:05:42 · 12 answers · asked by ParaskeveTuriya 4 in Astronomy & Space

At Night There Are Like Ten Of Them Attacking My Garbage Cans And Running Around My Yard....But Where The Hell Are They In The Day Time And Why Do They Not Rummage Through My Garbage Cans In The Day Time Hours?

2007-07-21 04:05:23 · 11 answers · asked by Anonymous in Zoology

Example:

5.000.000 or 5,000,000?

Is both of them is right? Or not? Probably each have different purpose for the different case?

10 pts for good or detailed answer.

2007-07-21 04:03:56 · 4 answers · asked by Doo.ri 3 in Mathematics

This is an example of a moon project.
http://www.newscientist.com/blog/space/

2007-07-21 04:00:17 · 7 answers · asked by Cravat 1 in Astronomy & Space

The following is an argument to prove that the direction perpendicular to motion doesnt contract. Is something wrong with the argument? (I know the results are correct) When two rings are at rest with respect to each other (when they are in the same frame of reference), they are exactly the same size. They are in a position similar to the tires on a car axle. Imagine that the rings travel toward each other. If the direction perpindicular to motion contracted then the postulate that all frames of reference are equally valid would be broken because ring 1 would see ring 2 to contract and go inside of ring 1 and ring 2 (because it is at rest in its own frame of reference) would see ring 1 contract go inside of ring 2.

2007-07-21 03:59:48 · 2 answers · asked by jjjjjjjjjjjjjjjj 1 in Physics

2007-07-21 03:57:43 · 6 answers · asked by Anonymous in Other - Science

2007-07-21 03:57:34 · 11 answers · asked by namebussi 1 in Weather

--The main advantage of steam distillation as a method of purification is the compounds insoluble in water may be distilled below their boiling point. Explain clearly why this is possible.

--Why are compounds boiling below 100degCelsius not subjected to steam distillation? Give at least three characteristics of a compound suitable for steam distillation.

2007-07-21 03:57:19 · 4 answers · asked by HansThane 2 in Other - Science

2007-07-21 03:52:29 · 4 answers · asked by Vinay Sirohi 1 in Engineering

2007-07-21 03:43:40 · 18 answers · asked by Dave 1 in Medicine

2007-07-21 03:41:54 · 19 answers · asked by Lai Yu Zeng 4 in Biology

Linear equation y=ax+b, would b have a vertex if b=3?

2007-07-21 03:31:18 · 2 answers · asked by littlesoutherner12 1 in Mathematics

How is it that, in this one area of our lives, we have convinced ourselves that our beliefs about the world can float entirely free of reason and evidence? Please no quotes from the bible or sermons required. Refrain from attacking me for asking this question.

2007-07-21 03:28:02 · 12 answers · asked by mvfwed 1 in Mathematics

You always hear about the city that got 24 inches of snow in a day but never about an area that got that much so how many inches of rain is equal to 10 inches of snow?

2007-07-21 03:27:53 · 10 answers · asked by Anonymous in Weather

2007-07-21 03:27:40 · 21 answers · asked by Dave 1 in Medicine

Does anybody know how far below SEA LEVEL the fens are in the UK?

I can see the UK equivalent of New Orleans happening here with all the storms that are battering the UK.

I live on the edge of the fens and it is very worrying. Flash floods have never been this bad in my lifetime until this summer.

2007-07-21 03:25:57 · 3 answers · asked by lollipoppett2005 6 in Weather

2007-07-21 03:25:12 · 11 answers · asked by lalamlal 2 in Weather

2007-07-21 03:25:12 · 8 answers · asked by zoeksalamander 4 in Weather