Science & Mathematics - 12 December 2006

4(third power) - 3(fourth power) =

a) 37

b) 0

c) –17

d) 145

2006-12-12 18:28:21 · 16 answers · asked by Anonymous in Mathematics

2006-12-12 18:27:04 · 4 answers · asked by Anonymous in Zoology

Aluminum metal is oxidized in aqueous base with water serving as the oxidizing agent.

Al(s) + H2O(1) → Al(OH)4- + H2(g) (basic solution)

Write a balanced equation for this reaction in basic solution.

2006-12-12 18:19:24 · 4 answers · asked by chem 1 in Chemistry

The half-life of cobalt-60 is 5.3 yr. How much of a 1.000-mg sample of cobalt-60 is left after a 10.6yr
priod?

A) 0.250mg B) 0.100mg C) 0.990mg D) 0.125mg

2006-12-12 18:17:20 · 9 answers · asked by chem 1 in Chemistry

sec^4 B - csc^4 B / sec^2 - csc^2 B

I'm not sure on how to do this problem.

2006-12-12 18:17:12 · 4 answers · asked by keenan93312 1 in Mathematics

x^4 + x^3 + x^2 -9x - 10 = 0. Solve for all possible solutions. There are three answers and one of them has an i.

2006-12-12 18:15:52 · 3 answers · asked by Anonymous in Mathematics

2006-12-12 18:15:21 · 14 answers · asked by Anonymous in Mathematics

before mitosis.

2006-12-12 18:14:56 · 2 answers · asked by Picard Facepalm 5 in Biology

These are the qustions may be asked in my lab on coming tuesday. Please answer and help me.
THIS IS ELECTRICAL MACHINES LAB.
load test on compound dc genetator.
1. said that at the starting of experiment armature resistance should be kept at max. and field resistance at min. positions. why?

2.why speed must be maintained const. through out the experiment.?

3. why 4 point starter arm must be kept at the extreme left position before switching on the supply?

4. what is tachometer? why it should be kept in line with the shaft while measuring the speed of the motor?

HOPE SOME MAY EXPLAIN ME THE ABOVE REASONS, UR S BROTHER MADHU.

2006-12-12 18:13:19 · 2 answers · asked by madhu1187 1 in Engineering

i hate these problems and never have the patience or knowhow to figure them out, but i think this one is relatively simple for anyonewho knows what thyre doing.

A box with a square bottom and open top is to be made from 27 square feet of material, what is the largest possible volume of the box.

I could really use help on this, its an example of a question that will be just like it on my final tomorrow so if someone could help id be very greatful.

2006-12-12 18:11:01 · 5 answers · asked by lenly36 1 in Mathematics

The reaction 2H2O2  2H2O + O2 has the following mechanism?

H2O2 + I–  H2O + IO–
H2O + IO–  H2 + O2 + I–
The intermediate(s) in the reaction is (are):

A) H2O B) IO– C) Both A & B D) I–

2006-12-12 18:10:37 · 1 answers · asked by chem 1 in Chemistry

A line segment AB is given. How can we draw a line perpendicular to AB and passing through A with a straight edge and a compass?

2006-12-12 18:07:29 · 2 answers · asked by magt_g 1 in Mathematics

2006-12-12 18:05:01 · 6 answers · asked by Anonymous in Medicine

2006-12-12 18:02:53 · 5 answers · asked by Kesari 1 in Mathematics

I have 10 file cabinets. The odds that a particular file is somewhere in one of the 10 file cabinets is anywhere from 0% to 100%, all equally likely. I look through 9 file cabinets, and fail to find it. What is the probability that I will find it in the last file cabinet?

2006-12-12 17:57:47 · 4 answers · asked by Scythian1950 7 in Mathematics

Most definitions of irrationals that I've seen, basically boil down to merely stating that they're real, but not rational. This is a definition in negative terms: stating what irrational numbers are NOT. According to what little formal logic I've been told, formal, mathematically-logical, consistently well-behaved definitions are supposed to be stated in the positive. I 'd like to know whether irrationals can be defined positively: stating what they ARE, in general, universally-applicable terms; not just giving some specific, limited examples. If irrationals cannot be defined positively, how can we then define reals without referring to irrationals, i.e.: without saying that reals are the union of rationals and irrationals? ...And, furthermore, how can we then define complex numbers? How can we continue using Math, if such fundamental definitions cannot be stated in formal, mathematically-logical, consistently well-behaved terms?

2006-12-12 17:57:11 · 7 answers · asked by Shem ben Av 1 in Mathematics

formula

2006-12-12 17:56:05 · 4 answers · asked by mihiryog y 1 in Mathematics

2006-12-12 17:51:18 · 13 answers · asked by chocolateT 2 in Biology

2006-12-12 17:50:31 · 16 answers · asked by LOMADA Renuka 1 in Parapsychology

2006-12-12 17:48:16 · 1 answers · asked by SUDESNA B 1 in Earth Sciences & Geology

2006-12-12 17:44:21 · 6 answers · asked by Anonymous in Zoology

2006-12-12 17:41:01 · 3 answers · asked by Anonymous in Biology

And the chemicals added to monsoon buckets full of water to fight Australian bush fires, are they the same as those used to treat clothing, carpets and furniture?

2006-12-12 17:39:45 · 4 answers · asked by zee_prime 6 in Chemistry

2006-12-12 17:39:44 · 8 answers · asked by bhupesh g 1 in Physics

trying to see what type of the chemicals make the pennies shine

2006-12-12 17:39:16 · 17 answers · asked by chou-ee 1 in Chemistry

Ok if Dinosaurs existed with humans then why hasn't anyone discovered a human in thier diet. I can't believe 40% of american christians acually beileve the earth is 10,000 years old and Dinosaurs lived the same time as humans. Dinosaurs aren't even mentions in the Bible!!! Isn't there some form of proof that shows the levals in the groud and how humans are much younger then that of any Dinosaur? I think Christians are whack to build a museum saying Christians lived the same time as Dinosars.

Wake up Christians

2006-12-12 17:36:22 · 17 answers · asked by Anonymous in Earth Sciences & Geology

What is the logic behind the dating of fossils? Assuming that the minerals of the earth have a maximum age of 4.65 billions years, is that the age all fossils are dated as, since they have replaced all organic material with rock? And then the different strata layers seperate into different periods? Or do the fossils actually have a different range of years as in one being 700 million years or another one being 1.3 billion years. Example. Someone finds a fossil. They date it. The result comes came 4.6 billion years. But it is in the jurassic layer of earth, so they know it came later on in history and the big number only shows the age of minerals it is made of. I am only assuming, I don't know. If someone could confirm my assumtion or correctly inform me, that would be great. thanks

2006-12-12 17:34:53 · 11 answers · asked by The GMC 6 in Earth Sciences & Geology

2006-12-12 17:34:36 · 8 answers · asked by csonski 1 in Zoology

1) -14,28
2) -28,32

2006-12-12 17:32:37 · 3 answers · asked by Anonymous in Mathematics

2006-12-12 17:32:08 · 13 answers · asked by Peter Griffin 1 in Geography