Science & Mathematics - 10 December 2007

equation 1: (20-2y)=5x, equation 2: (26-4y)=3x use elimination please show me the complete solution. thanks

2007-12-10 23:57:08 · 6 answers · asked by chuchu 2 in Mathematics

Plz explain why

2007-12-10 23:55:12 · 5 answers · asked by nonay 1 in Mathematics

radio trivia

2007-12-10 23:52:36 · 34 answers · asked by Dana 1 in Astronomy & Space

I need statistics for years 1990-2004 (for all years)

Country: ITALY

Gases:

CO2 - Carbon dioxide *already found on unfccc.int*
CH4 - Methane
N2O - Nitrous oxide
PFCs - Perfluorocarbons
HFCs - Hydrofluorocarbons
SF6 - Sulphur hexafluoride

+of course Add "source" if you can find anything for me)))

Thanks in advance~

2007-12-10 23:44:30 · 1 answers · asked by Desert Rose 3 in Earth Sciences & Geology

its a Massy 675. It does sometime manage to turn the engine a couple of times. I was wandering whether it could be the solenoid, it seems to smoke a little when the key is turned? Any ideas?

2007-12-10 23:41:24 · 17 answers · asked by Nick L 1 in Agriculture

its about waves.. can u please enumerate the types of waves?
and differentiate each type of waves.. Ope u can help me ^__^ tnx.

2007-12-10 23:24:13 · 3 answers · asked by Tiffy4391 1 in Physics

I'd like to attach the bases of the aluminum cans but I want it to look seamless. Any suggestions if you don't think it's possible would be appreciated too.

2007-12-10 23:19:42 · 3 answers · asked by JON 2 in Engineering

Is it clock wise or anticlockwise?

I am in a warm room at the South Pole and I have a container full of water fixed to the Earth. I see that the water is prefectly still. Then I let out the water. What way will I see the water spin as it is draining? Why this direction? Why will I see it spin?

2007-12-10 23:19:26 · 2 answers · asked by Gotcha 3 in Physics

can any one say the integral of root cos x did this exists if not say the reason

2007-12-10 23:00:52 · 2 answers · asked by anjith g 1 in Mathematics

I know it is common to refer late summer/early fall high temps as a indian summer, but I believe there is an actual criteria for it. I believe when those temps arrive after a freeze or something. Anyone here know?

2007-12-10 22:57:13 · 5 answers · asked by blueshoe711 4 in Weather

2007-12-10 22:54:54 · 8 answers · asked by Max A 1 in Astronomy & Space

2007-12-10 22:48:09 · 11 answers · asked by cucumis_sativus 5 in Weather

2007-12-10 22:44:30 · 10 answers · asked by Anonymous in Mathematics

1. While an object is moving at a constant 20 m/s, a 5 N force pushes the object to the left. At the same time, a 5 N force is pushing the object to the right. What will the object's velocity be after 10 seconds?
2. A bowling ball has a mass of 6 kilograms. A tennis ball has a mass of 0.06 kg. How much inertia does the bowling ball have compared to the tennis ball?
3. A rider and motorcycle with a combined mass of 250 kg are driving down the road at a constant speed of 55 mph. The motorcycle’s engine is producing a force of 1,700 newtons
between the tires and the road.
a. Find the weight of the motorcycle and rider in newtons.
b. Find the normal force of the road on the motorcycle and rider.
c. Find the frictional force of the road and air on the motorcycle and rider.
4. What is the net force on the refrigerator shown to the right?
5. Jane has a mass of 40 kg. She pushes on a 50-kg rock with a force of 100 N. What force does the rock exert on Jane?

THANKS!!!!!!

2007-12-10 22:42:32 · 3 answers · asked by Anonymous in Physics

2007-12-10 22:38:58 · 5 answers · asked by John G 3 in Botany

Is there such a thing as frictionless surfaces?

2007-12-10 22:35:40 · 14 answers · asked by JOHN M 3 in Astronomy & Space

2007-12-10 22:34:41 · 3 answers · asked by Colin H 1 in Mathematics

many warm ocean currents occurs in the eastern part of the world for insence the Mozambique warm current while most of the cold ocean currents are in the western part of the the world the Banguela being an example as the result these cold currents becomes the permanent causes of Deserts in the world such as the Kalahari,the Gobi, the Sahara, the Namibi desert in Africa the Atakama in America .
What do you think can be the causes and if there, can`t they be eliminated or reduced?

2007-12-10 22:24:04 · 3 answers · asked by Anonymous in Geography

2007-12-10 22:03:07 · 4 answers · asked by Anonymous in Earth Sciences & Geology

2007-12-10 22:00:20 · 3 answers · asked by Jamil A 1 in Botany

2007-12-10 22:00:12 · 4 answers · asked by Anonymous in Astronomy & Space

geraldo and luisa hernandez operate a small laundry. luisa, working alone, can clean a day's laundry in 9 hrs. geraldo can clean a day's laundry in 8 hrs. how long would it take them if they work together?

2007-12-10 21:57:36 · 4 answers · asked by gca18 1 in Mathematics

It it possible to reverse it's purpose, i.e. use it as a generator rather than a motor.

2007-12-10 21:52:52 · 5 answers · asked by Anonymous in Engineering

For simplification sake, assume that the chances of life spontaneously and randomly occurring from non-life is 1 in 1 million.
Now extend the time period out for that event to occur to 1, 3, 4, or even 6 billion years. Does the probability change because the time allowed for it happen has increased? Meaning, will the 1 in one million chance have better odds over time?
Please give an equation and state the value for time and how it effects the probability. Thank you.

2007-12-10 21:47:48 · 7 answers · asked by Last Ent Wife (RCIA) 7 in Mathematics

U hav to use the number 4 exactly 4 times in each equation to make it equal to nos.1-9.u can put any mathematical operations in between but after one 4 only.
for eg: 4 divided by 4 + 4 - 4=1
now do from nos.2-9

2007-12-10 21:46:00 · 7 answers · asked by Priyanshi K 1 in Mathematics

the sun will die someday and the earth will go with it as well, or two galaxies collide, or maybe us.....what way will likely happen when earth meets its end?

2007-12-10 21:41:59 · 15 answers · asked by Phoenix Trite 4 in Astronomy & Space

do you think somewhere out there, there is some kind of Government/Council that consist of the brightest Aliens that are handpicked for keeping an eye on the universe?

making sure there is balance in the universe, making sure there arent species trying to take over other planets. or keeping an eye on rogue aliens that have their mind set for universal domination, stuff like that along with politics.

2007-12-10 21:36:22 · 9 answers · asked by Phoenix Trite 4 in Astronomy & Space

2007-12-10 21:28:44 · 5 answers · asked by Anonymous in Mathematics

Find the value of x and y

1) 3x - y + 4z = -7
2x + y - z = 16
5x - 3y + 2z = -13

2) 4x - 3y = 5
-8x + 6y = 7

2007-12-10 21:22:28 · 2 answers · asked by Anonymous in Mathematics

Take two identical, nonrotating, 5-solar-mass black holes and place them side by side. Add one solar mass of pineapples to the left-hand one and one solar mass of radioactive uranium to the right-hand one (without changing their electric charge or their rotation). Afterward, how do these two black holes differ?

a. The left-hand one will smell better.
b. The right-hand one is radioactive, emitting alpha particles, electrons, and gamma rays.
c. The right-hand one has a stronger gravitational field because of the denser matter inside it.
d. They do not differ at all.

2007-12-10 21:17:12 · 3 answers · asked by Abyssinian P 2 in Astronomy & Space