Science & Mathematics - 15 December 2007

which energy: wind energy, solar power, fossil fuels, geothermal energy????

2007-12-15 03:54:47 · 10 answers · asked by Anonymous in Physics

i know how to find derivative of a point easy. im thrown by not being given any function im just shown a graph, so do i figure out what the function of the graph is? im looking through my book and having trouble finding how to do it. do i take multiple points and find the derivative at each one then graph it? im soo lost please help.

thanks

2007-12-15 03:54:02 · 3 answers · asked by Curious 2 in Mathematics

The building block of silicate minerals is the

a.trigonal-planar SiO3 unit.
b.octahedral SiO6 unit.
c.tetrahedral SiO4 unit.
d.bent SiO2 unit.
e.linear SiO unit.

2007-12-15 03:53:47 · 1 answers · asked by Anonymous in Chemistry

2007-12-15 03:50:14 · 4 answers · asked by Anonymous in Physics

why do fossil fuels eg. coal have energy ie the energy source of the fossil fuel.

2007-12-15 03:49:07 · 7 answers · asked by Anonymous in Physics

Can somebody help me on factorising i know how to expand brackets but i find factorising harder.

36X(I dont know how to get the Algebra x) -30y-42 z
and 2cd-3de+4d

Thank You so much and have nice day :)

2007-12-15 03:43:19 · 3 answers · asked by Anonymous in Mathematics

A 42 kg of ice slides down the plane incline 34 degrees in the figure. Assuming friction is negligible, what is the acceleration of the block down the incline? If the kinetic coefficient of friction is 0.060, what is the acceleration of the block down the incline?

Please show and explain all work. Please show the formula or formulas that were used.

2007-12-15 03:40:47 · 3 answers · asked by Kantilal P 1 in Physics

2007-12-15 03:39:36 · 13 answers · asked by Rock star 2 in Astronomy & Space

A horizontal force of 5 N accelerates a 4 kg mass, from rest, at a rate of 0.5 m/s^2 in the positive direction. What frictional force acts on the mass? What friction acts on the mass? What is the coefficient of friction for the surfaces in contact?

Please show and explain all work. Please show the formula or formulas that were used.

2007-12-15 03:37:41 · 2 answers · asked by Kantilal P 1 in Physics

8/9 6/8 5/7 100/200 52/3 2/3

2007-12-15 03:37:37 · 4 answers · asked by rachel 1 in Mathematics

I hve an Earth Science Lab which is due on Monday and I can't figure out how to use my geographic safety compass, however I did fine with the ones in class. Is there a difference between Geometric and Geological Safety compasses? I need one which will help me draw the circles for the seismograms that will help me locate the epicenter. I'm only in middle school, so please help!!!

2007-12-15 03:36:58 · 2 answers · asked by nibor194 3 in Earth Sciences & Geology

such as 83 times 5=415 83 would be called the __

2007-12-15 03:31:34 · 4 answers · asked by Anonymous in Mathematics

1.4-10=9-15; If , 6 1/4 is added both sides, it will be as :-
4-10+6 1/4= 9-15 +6 1/4 clear equality
2.So 4-10+ 25/4 =9-15 +25/4 still the same These look like
axa - 2ab +bxb similarly rt one cxc-2cd +dxd, make it.
2x2 -2x2x5/2+5/2x5/2 and rt one 3x3 -2x3x5/2 +5/2x5/2
3. final:_
(2-5/2)x(2-5/2) = (3-5/2)x(3-5/2)
( a-b) whole square and (c-d) whole square
4.Now work least and give answer clarify one clearing idea
with litle conformation and prove

2007-12-15 03:31:27 · 3 answers · asked by Anonymous in Mathematics

2007-12-15 03:26:08 · 3 answers · asked by Anonymous in Geography

i've had two paranormal experiences with UFOs. tell me yours!

2007-12-15 03:26:01 · 11 answers · asked by spiritmolecule 2 in Paranormal Phenomena

2007-12-15 03:25:18 · 25 answers · asked by miley 2 in Mathematics

1. The function f is defined for all x which is not equal to 0 in interval -1
a) How should f(0) be defined in order that f be continuous for all x in the interval -1
b)With f(0) defined as in part (a), use the definition of the derivative to determine whther f'(0) exists.

2007-12-15 03:20:23 · 2 answers · asked by leonardo 1 in Mathematics

Why lava are hot? How they gain the energy? Will the centre of earth lose energy and become cooler after a long time?

2007-12-15 03:19:56 · 3 answers · asked by Anonymous in Earth Sciences & Geology

saw a program about the moon landings, the earh looked about the same size as the moon does from here, given that one is a lot bigger than the other how can this be.

2007-12-15 03:18:32 · 12 answers · asked by hamyam69 1 in Astronomy & Space

How do machines know that you put in a coin?

2007-12-15 03:11:08 · 14 answers · asked by futuretopgun101 5 in Engineering

i mean we always have this extra trash so why can't we leave on a planet since there is so much of space or we can just send a rocket with no people,just trash to the sun.i mean it will just burn up and its not like we use any other rocket again so this wouldn't be a waste of money either.

2007-12-15 03:10:42 · 19 answers · asked by Anonymous in Astronomy & Space

My house is over 200 years old and I live in a region that has sub zero winters with snow that can collect up to 8’. I wonder how the people who built and lived in this house survived without foreign or local fuel. Why has fuel become a life or death necessity?
Have we evolved somehow that we cannot tolerate cold weather like our ancestors did and like animals do now (birds, farm and forest animals etc…)

2007-12-15 03:06:48 · 5 answers · asked by Anonymous in Biology

2007-12-15 03:04:04 · 6 answers · asked by vision 1 in Paranormal Phenomena

I am 12 and I am intrested in space and I want to become an astronaut (or an astronomer if thing don't work out).What are the requirements or what subjects do you have to be good at.I also know you have to physically fit to qualify.

2007-12-15 03:02:13 · 6 answers · asked by Anonymous in Astronomy & Space

2007-12-15 03:00:06 · 4 answers · asked by punk royale 1 in Medicine

I know why oxygen is essential in a red blood cell but why would carbon dioxide be?

2007-12-15 02:59:19 · 5 answers · asked by Anonymous in Medicine

i need help on my math, ty

2007-12-15 02:57:02 · 5 answers · asked by james m 1 in Mathematics

Silicon, which is in group IV , why cannot form a giant molecular structure itself like carbon, but with oxygen to form quartz?

2007-12-15 02:54:14 · 3 answers · asked by Anonymous in Chemistry

Are they still similar enough for a identity check?

2007-12-15 02:47:17 · 4 answers · asked by Grinning Football plinny younger 7 in Biology

I'm doing a project and I need an LED light. I need a small one that has two wires sticking out the back. Are there any items that almost any household would have that cointain a small, white LED light.

2007-12-15 02:47:02 · 6 answers · asked by Anonymous in Other - Science