Science & Mathematics - 26 September 2006

..it?

2006-09-26 03:02:29 · 27 answers · asked by smart_babe 3 in Other - Science

6x cubed=5x-7

2006-09-26 02:58:29 · 10 answers · asked by alyssa g 1 in Mathematics

2006-09-26 02:56:49 · 3 answers · asked by durga d 1 in Medicine

Using the six basic laws of arithmetic (associative, commutative, distributive) one at a time, explain why each real number of the following is true:

(a) for all real numbers x, y, z, and w, (x+y) + (z+w) = (w+x) + (z+y)

(b) for all real numbers x and y, (x+1) 6 + y * (x+1) = (y+6) * ( x+1)

(c) (x+4) * 6 + y * x + (x+4) + 4 * y = (x+4) * (y+7) for all x and y

(d) (x*y + v*x) + (v*y + x^2) = (x+y) * (x+y) for all x, y, and v

(e) for all real numbers x, y, a, & b, (x+y)(a+b) = xa + xb + ya + yb


Where the *, is times (multiplication)
If someone could write these out and explain why they are true, it would be greatly appreciated!

2006-09-26 02:54:52 · 2 answers · asked by Anonymous in Mathematics

2006-09-26 02:52:48 · 12 answers · asked by chha 1 in Chemistry

Two mathematicians were walking down the street. They had not seen each other for a while, One asks the other.
" Say, how are your three kids? How old are they now?"
The other mathematicain answers.
"The product of their ages is 72. The sum of their ages is..."
He points to a number on a nearby street sign.
The first mathematician answers.
"That is not enough information for me to solve the problem!"
To which the first replies.
"You're right...my youngest daughter likes strawberry shortcake."

How old are the 3 children?

2006-09-26 02:45:06 · 6 answers · asked by runningman022003 7 in Mathematics

2006-09-26 02:44:56 · 9 answers · asked by Anonymous in Physics

to send out a probe with a telescope like the hubbles into deep space toward the closest(Presumably) life supporting world(s) with a laser communications system to send back clearer pictures? Every so often smaller probes designed to capture these signals could be sent out on the same course following the first and so on to boost the first probes signal back to earth like a giant antenna. Clear information at the speed of light. Think of the information we could gather? That and the fact that we could boost our signal to the farthest reaches of space. You would think that with all the communications satallete technology we have now this could be achieved. I know price is a factor but If you used the money typically spent on the space shuttle missions and had private investors? Think of the posssibilities? Could anyone with proper knowledge of this technology give me an answer and details why this would or would not be plausable.

2006-09-26 02:44:43 · 5 answers · asked by Anonymous in Astronomy & Space

2006-09-26 02:43:40 · 3 answers · asked by Lisa 1 in Biology

2006-09-26 02:42:39 · 23 answers · asked by Anonymous in Earth Sciences & Geology

2006-09-26 02:41:34 · 3 answers · asked by Anonymous in Other - Science

In the search for alternative forms of energy, tapping the fringes of the Earth's core for heat would appear to be within the realm of possibility. Using heat from that source we could eliminate the need for home heating oil. How far down would you have to drill to get to about 100 degrees F soil/rock temperature or more?

2006-09-26 02:41:07 · 3 answers · asked by zahbudar 6 in Earth Sciences & Geology

2006-09-26 02:39:32 · 11 answers · asked by Anonymous in Physics

what is the job called where people cut other people up to find out when and. why and how they died?

2006-09-26 02:37:21 · 17 answers · asked by moskito 2 in Other - Science

Can you describe the size of the drill shaft in inches?

2006-09-26 02:33:40 · 5 answers · asked by zahbudar 6 in Earth Sciences & Geology

2006-09-26 02:25:17 · 11 answers · asked by siva r 1 in Physics

Can pepsin and tryspin fuction in the same enviroment? Explain using scientific reason to earn points

2006-09-26 02:23:42 · 3 answers · asked by Zman 1 in Biology

What are the names of these drugs and what are the main viral activities that these drugs are designed to counteract?

2006-09-26 02:23:08 · 3 answers · asked by 9929 3 in Biology

Why does the needle sink after soap is added to the water? Give a scientific reason to earn points.
Keep In Mind that a soap molecule is long with one end attracted to oil molecules
and that one end of a soap molecule is polar, and the other end is nonpolar. Soap will dssolve , and the soap molecules will float freely in water. And a sewing needle will rest upon the surface of water. If powderered laundry detergent is gently spinkeld near the needle, the needle will eventually sink.

2006-09-26 02:20:52 · 5 answers · asked by Zman 1 in Biology

Explian why a needle floats in water? Give a scientific reason to earn points.

Keep In Mind that a soap molecule is long with one end attracted to oil molecules
and that one end of a soap molecule is polar, and the other end is nonpolar. Soap will dssolve , and the soap molecules will float freely in water. And a sewing needle will rest upon the surface of water. If powderered laundry detergent is gently spinkeld near the needle, the needle will eventually sink.

2006-09-26 02:19:46 · 8 answers · asked by Zman 1 in Biology

which ethnic group has the highest incidence of this disease?

2006-09-26 02:18:02 · 5 answers · asked by 9929 3 in Biology

2006-09-26 02:17:18 · 2 answers · asked by brazukinha 1 in Biology

Explain why adding soap to water will help remove dirt and oil. Give a scientific reason why to earn points.
Keep In Mind that a soap molecule is long with one end attracted to oil molecules
and that one end of a soap molecule is polar, and the other end is nonpolar. Soap will dssolve , and the soap molecules will float freely in water.

2006-09-26 02:17:17 · 7 answers · asked by Zman 1 in Biology

plz give a list to the meaning of those terms and the graphs!

2006-09-26 02:12:12 · 2 answers · asked by ankit g 1 in Engineering

1: Which substance is readily converted from a liquid to a solid by chemical reaction with hydrogen?
cotton-seed oil

glycerin

kerosene

mercury


2: The ability of a substance to remove oxygen from a compound is called
oxidation

hydrogenation

electrolysis

reduction


3: When passed over hot copper oxide, hydrogen acts as
a catalyst

X an oxidizing agent
a reducing agent

a solute


4: Hydrogen can be prepared by reacting cold water with
aluminum

iron

platinum

X sodium

5: The safest way to make hydrogen in the laboratory is to add hydrochloric acid to
calcium

iron

potassium

sodium


6: Hydrogen may be formed when steam reacts with hot
copper

X iron
mercury

silver


7: The lightest element known is
boron

helium

hydrogen

lithium


8: Hydrogen is
less dense than air and inert

very soluble in water and combustible

odorless and a reducing agent

denser than air and tasteless


9: Hydrogen may be obtained by the reaction of hydrochloric acid with
copper

mercury

silver

zinc


10: When copper oxide is heated with hydrogen, which substance is oxidized?
X copper
copper oxide

hydrogen

water


11: Uncombined hydrogen is found in
soda water

acids

hydrogen peroxide

water gas


12: When hydrogen and oxygen are mixed
they explode

they combine forming water slowly.

they form hydrogen peroxide.

they form an explosive mixture.


13: Hydrogen was discovered by
Preistly

Scheele

Lavoisier

Cavendish


14: In the preparation of hydrogen in the laboratory the acid used is added through the
delivery tube

thistle tube

trough

collecting bottle


15: Hydrogen is used:
to support burning

as part of fuel gas

as an explosive

as a cooling agent


16: If lead oxide is heated in a stream of hydrogen, the products will be
lead hydride and oxygen

lead and water

lead oxide and hydrogen

lead oxide and water


17: A cold piece of iron was held over a Bunsen flame. Droplets of water collecting on the cool surface indicated that the fuel contained
carbon

carbon dioxide

carbon monoxide

hydrogen


18: Helium rather than hydrogen is used in dirigibles because
it is lighter than hydrogen

it is insoluble

it is cheaper

it does not burn


19: If an explosion results from placing a burning splint into a bottle of gas, the gas may have been
oxygen

carbon dioxide

hydrogen

nitrogen


20: The removal of oxygen from a compound is called
oxidation

hydrogenation

reduction

filtration


21: Holding a bottle of hydrogen inverted and without a cover plate indicates that hydrogen
is a gas

is heaver than air

is lighter than air

is soluble in water


22: In the process of reduction, whenever one substance is reduced, another is
hydrogenated

oxidized

aerated

condensed

2006-09-26 02:10:53 · 5 answers · asked by Anonymous in Chemistry

2006-09-26 02:10:18 · 11 answers · asked by Gun Du 1 in Other - Science

Amino acid are often esterified with methanol by using thionyl chloride or hydrogene chloride as catalist. Did you know if an important amount of methylchorid is formed ?

2006-09-26 02:07:50 · 4 answers · asked by schneiderj 2 in Chemistry

2006-09-26 02:01:30 · 7 answers · asked by Anonymous in Astronomy & Space

The moon and sun cause the tides, but how about the black holes or the mass that our solar system is attracted is this detectable?

2006-09-26 02:01:07 · 6 answers · asked by treb67 2 in Physics

if there was a tsunami in UK?? assuming the epicentre was in between France and UK? and one above scotland aswell.

2006-09-26 01:59:33 · 15 answers · asked by Fbfbfbfb 2 in Earth Sciences & Geology