Science & Mathematics - 12 November 2007

ok i need u to imagine it cuz i've got no idea how to draw it out..pls don't give me lengthy explanations..just the solution

1.in a circle, there are 2 sectors facing each other..
one sector is 108degrees with the length of arc of 6cm
the oppsite sector is y degrees with the length of arc at 2.5cm
how do i find y?

2. in another circle, two sectors facing each other..
the first sector is 30 degrees and length of arc =3cm
the opp sector is 120 degrees and length of arc=4.8cm
how do i find y?

2007-11-12 17:34:34 · 2 answers · asked by BH6413021 2 in Mathematics

2007-11-12 17:33:48 · 7 answers · asked by ramesh p 1 in Zoology

can a^2 + b^2 be factorised when it appears in a rational expression ?

2007-11-12 17:27:45 · 4 answers · asked by c0cky 5 in Mathematics

2007-11-12 17:26:46 · 26 answers · asked by Anonymous in Mathematics

I was recently watching the Discovery channel and if you go down some were em between 2 and 5 miles in the earth it start to get hot due to geothermal heat. In Russia they have drilled as far as 7 miles and there are salt mines in the U.S that have gone as far as 2 miles, they would be deepper but its to hot. Why not drill far enough down to insert or blow out a cavity to retain water and use the geothermal power to boil it and pip the steam back to a steam turbine giving us free power..

2007-11-12 17:20:06 · 8 answers · asked by Evil D 4 in Earth Sciences & Geology

I am not sure on how to measure the rust on nails. Is it possible to scrape the rust off and measure the rust on a scale? Also does the weight of a nail increase or decrease when rust forms on it?

2007-11-12 17:19:50 · 3 answers · asked by Anonymous in Chemistry

2007-11-12 17:18:32 · 14 answers · asked by bob m 3 in Earth Sciences & Geology

2007-11-12 17:17:48 · 5 answers · asked by Jade L 2 in Astronomy & Space

2007-11-12 17:17:07 · 11 answers · asked by bob m 3 in Astronomy & Space

2007-11-12 17:16:11 · 6 answers · asked by broken_lies14 2 in Chemistry

Hi, I need urgent help finding critical numbers of the function on the interval 0 ≤ θ < 2pi. f(θ) = 2cos(θ) + sin^2(θ).

Any help would be appreciated!

2007-11-12 17:15:30 · 2 answers · asked by xìn xīn 1 in Mathematics

2007-11-12 17:13:13 · 2 answers · asked by Freebrum 3 in Mathematics

I think I figured there is 2 formulas to find the focus of a parabola.
One is h + p , k

and the other is

h, k + p

how do I know when to use which one,
ahhhhhhh help.
thanks

2007-11-12 17:09:39 · 1 answers · asked by Boo Radley 4 in Mathematics

2007-11-12 17:02:58 · 2 answers · asked by Sylvia 2 in Botany

Will it mean that the the rate of consumption will be greater because it will take less amount of time for the the consumption of oxygen.

2007-11-12 17:02:41 · 2 answers · asked by Anonymous in Biology

2007-11-12 17:02:17 · 1 answers · asked by Anonymous in Mathematics

What do you think of this?

This was a link from Yahoo's main home page.

" New technique creates cheap, abundant hydrogen: report"
http://news.yahoo.com/s/afp/20071112/sc_afp/ussciencefuel

""This process produces 288 percent more energy in hydrogen than the electrical energy that is added in the process," said Bruce Logan, a professor of environmental engineering at Penn State."


"Clean, carbon-neutral hydrogen on the horizon"
http://live.psu.edu/story/27233?rss=49

2007-11-12 16:58:43 · 2 answers · asked by Anonymous in Other - Science

how could you see planets stars galaxies etc

2007-11-12 16:58:11 · 12 answers · asked by yrag 1 in Astronomy & Space

Wow, I feel like Jim Carray in Dumb and Dumber when he is like, "WE PUT A MAN ON THE MOON" wow. I was just reading a article about dinos on msn when it struck me, 67,000,000 years ago these animals ruled the planet. And then again, how the heck did they get so big? How long has Earth been around? Was there human life back then that hasn't been discovered? What roamed the Earth before dinosaurs? It is a great mystery that just has me thinking. What are your thoughts about life and how we got here. If dinosaurs were just created out of nowhere why can't they just be created again?

2007-11-12 16:53:07 · 3 answers · asked by William Z 4 in Earth Sciences & Geology

When looking at a model of the solar system, what caused all of the planets (RIP Pluto) to eventually settle on one plane? I would think that after the Big Bang all of the matter would have been scattered 3-dimensionally (which i'm sure it was), then why aren't the planets circling all over the sun? On the same note, larger scale, same action with galaxies.

2007-11-12 16:49:57 · 6 answers · asked by Mike B 1 in Astronomy & Space

The notes that I have aren't helping me much.

First problem:
A 9-foot board is cut into two pieces so that one piece is 5 feet longer than three times the shorter piece. Find the length of both pieces.

Second problem:
The number of women attending a math class was 9 less than twice the number of men. If a total of 63 students attended the class, how many were women?

I do remember doing these problems back in high school, but for some reason these are the only math problems I have trouble with! Any help is GREATLY appreciated. Thanks!

2007-11-12 16:49:52 · 13 answers · asked by Anonymous in Mathematics

please show me how to work this out, Thanks

2007-11-12 16:43:27 · 8 answers · asked by Anonymous in Mathematics

It collides and couples with three other coupled railroad cars, each of the same mass as the single car and moving in the same direction with an initial speed of 2.08 m/s.

2007-11-12 16:37:44 · 2 answers · asked by r chris 2 in Physics

2zx(2)y=18 where x=1, z=y?

2007-11-12 16:37:21 · 5 answers · asked by Intrigued..... 2 in Mathematics

For a 50hp new motor, 65A rated current motor - No Load I=30A
In my old motor of same 50HP,65A, No load I=17A
What is the reason?

2007-11-12 16:35:50 · 4 answers · asked by bala m 1 in Engineering

2007-11-12 16:34:24 · 1 answers · asked by Darry 1 in Mathematics

can't find an equation to use for this max/min problem

an open box is to be made from a sheet of card board with area 24 ft. squared by cutting out even squares (sides x ft.)from the corners and folding up. what are the dimensions of the box for the maximum volume?

2007-11-12 16:33:17 · 3 answers · asked by anf3rnee23 1 in Mathematics

A 59 kg swimmer jumps off a 9 m tower so....

Find the swimmer's velocity when hitting the water.

The swimmer comes to a stop 2 m below the surface. Find the net force exerted by the water.

2007-11-12 16:32:20 · 1 answers · asked by soccerlover39 1 in Physics

The theory of special relativity states that an observer experiences the same speed of light no matter what speed he and his origin of light are traveling relative to each other.

2007-11-12 16:32:03 · 2 answers · asked by Rockstar 6 in Physics

x/x+3 and 4/5 are frations

2007-11-12 16:28:46 · 5 answers · asked by nikia watson 1 in Mathematics