Science & Mathematics - 19 December 2007

it boaring

2007-12-19 06:12:10 · 7 answers · asked by estefany u 2 in Weather

just out there on their own.....how did that happen and what becomes of them?

2007-12-19 06:09:41 · 3 answers · asked by theypissonourbacksandsayitsrain 1 in Astronomy & Space

A 2.0-kg ball has a velocity of 15m/s downward just before it strikes the ground and bounces up with a velocity of 12m/s upward.

What is the change in momentum of the ball?

2007-12-19 06:09:21 · 2 answers · asked by xxtruflipxx 1 in Physics

I've been studying for a math final coming up and I'm not sure how to do this. If someone could explain it out to me, it'd be much appreciated!!!

2007-12-19 06:06:03 · 6 answers · asked by hmm 3 in Mathematics

22.1 minus 16.0 over 16.0?

2007-12-19 06:03:50 · 4 answers · asked by Josephine K 1 in Mathematics

Find the solution set for y:

(3/4)y < 9 AND -(1/3)y <= -15

2007-12-19 06:00:20 · 1 answers · asked by Confused 1 in Chemistry

A sealed container has a volume of 0.020m^3 and contains 20g of molecular nitrogen (N2) which has a molecular mass of 28 u. The gas is at a temperature of 252 degrees celsius.

a) What is the pressure of the nitrogen gas?

b) If 500 Joules of heat are added to the gas, what is the change in its temperature?

2007-12-19 05:58:40 · 1 answers · asked by flipnv86@sbcglobal.net 1 in Physics

a wedge ABCDEF has a perpendicular to the plane FEDC with measurements BC=5cm,CD=12cm,DE=13cm
Calculate:
(i)the length,in cm,of BD
(ii)the surface area,in cm2,of the wedge
(iii)the volume,in cm3,of the wedge
(iv)the size of angle BDC

2007-12-19 05:56:33 · 3 answers · asked by baby 1 in Mathematics

A 2000-kg car rolls 80m down a frictionless 20 degree incline. If there is a horizontal spring at the end of the incline, what spring constant is required to stop the car in a distance of 1.0m?

2007-12-19 05:53:10 · 2 answers · asked by flipnv86@sbcglobal.net 1 in Physics

the internal dimensions of a saucepan shaped like a cylinder are height 20cm and diameter 35cm. Calculate to the nearest whole number,
(i)the area,of the bottom of the saucepan
(ii)the largest volume of liquid,in cm3,which the saucepan can hold.

2007-12-19 05:53:09 · 3 answers · asked by baby 1 in Mathematics

I'm braindead, help me out.

2007-12-19 05:51:52 · 4 answers · asked by WHAT THE HELL 4 in Mathematics

A football is kicked with a speed of 18 m/s at an angle of 65 degrees to the horizontal.

a) How far does the football travel horizontally before it hits the ground?

b) What are the respective horizontal and vertical components of the initial velocity of the football?

2007-12-19 05:49:00 · 2 answers · asked by flipnv86@sbcglobal.net 1 in Physics

1.Solve for x: √(3x - 5) = 4 ?
2.Solve for x: √(3x+1)-√(x-1) =2 ?
3.-3 - √(3x+1) = 0 has no roots. (true or false)?
4.3 + √(3x+1) = x has two roots.(true or false)?
5.Solve for x: √(x + 12) = x ?
6.Solve for x: √(x - 5) = -1 ?
7.Solve for x: √(x2+ 64) =16 -x ?
8.Solve for y: √(2y+ 7) - √(y + 4)= 2 ?
9.The solution of √(x + 11) = x- 1 is -5.( True or False) ?
10.The solution of √(x + 11) = 3 is -2. (True or False )?
11.Solve for x: √(x2+8x) =4√3 ?
12.Solve for x: √(5x + 1) = √(4x + 1) ?
13.Solve for x: - √(x) = -1 ?
14.Solve for x: x + 1 = √(x + 7) ?
15. √(x + 1) +3 = 2 has no real roots.(True or False )?
16.Solve for x: √(x2-x + 5) =5 ?
17.Solve for x: √(2x2+ 7x ) -2 =x ?
18.Solve for x: x - √(2x + 1) =7 ?
19.Solve for y: 4 + √(5y + 1)= 0?
20.√(x 2+ 3x + 2) = -4 has no real roots. ?
21.Solve for x: 2√(x - 3)+ 6 =x ?
22.Solve for x: √(x + 10) =7 -√(x - 11)?
23.Solve for x: √(x2+ 4x - 1) =√(x - 3) ?
24.Solve for x: √(x+16)-√(x) -2 = 0 ?

2007-12-19 05:47:19 · 3 answers · asked by Daniel P 2 in Mathematics

5x^2+2y^2-20x+24y+82=0

2007-12-19 05:45:55 · 2 answers · asked by Bashir B 1 in Mathematics

What is the science on this one? Is it the removal of oxygen? the elemination of heat source??

2007-12-19 05:44:25 · 13 answers · asked by Snowtime 2 in Chemistry

Is there any by-product of nuclear power that looks like the "nuclear waste" seen all the time in movies and on TV?

Like glow-in-the-dark, neon green, snot?

2007-12-19 05:43:57 · 1 answers · asked by juicy_wishun 6 in Other - Science

y^2+10y-20x+37=0

2007-12-19 05:41:10 · 2 answers · asked by Bashir B 1 in Mathematics

Bucket wheel excavators are used extensively around europe to remove overburden and extract lignite for power stations.

The largest offer 240,000 tonnes per day production.

But just how efficient are they over a year.

What are the realistic yearly production rates.

I am curious as this is a lot for one machine to actually handle.

Is there any where I can check?

2007-12-19 05:38:32 · 1 answers · asked by Anonymous in Engineering

i need to know the answer to these questions...does bella become a vampire and does she stay with edward or go to jacob. if i don't know then i won't end up reading the rest of the books so please answer this...

2007-12-19 05:35:21 · 5 answers · asked by karabear4053 2 in Astronomy & Space

2007-12-19 05:28:56 · 6 answers · asked by Munec 1 in Mathematics

2007-12-19 05:27:19 · 8 answers · asked by yerfavoritefiddler 4 in Astronomy & Space

6f)m^2-25/m^2-16 divided by 2m-10/4m+16

2007-12-19 05:26:28 · 2 answers · asked by Tommy F 1 in Mathematics

Radioactive disintegration of some kernel occurs under the scheme:
X ----> 2 α 4 + 84 Po 218
Find the activity of element X in 11,4 day after the beginning of disintegration.
(use sub and superscript beside of α and Po)

2007-12-19 05:20:06 · 2 answers · asked by nilavan2004 1 in Physics

2007-12-19 05:08:03 · 3 answers · asked by Anonymous in Mathematics

2007-12-19 05:03:56 · 5 answers · asked by chapped lips 5 in Earth Sciences & Geology

2007-12-19 05:02:03 · 15 answers · asked by kurisu95 3 in Geography

2007-12-19 05:01:43 · 12 answers · asked by AirConditionedGypsy 1 in Engineering

I tried factoring it since it was in quadratic form and got:

(r-7)(r-7)

and then found the roots to both be r=7, but in the back of the book it shows the answers to be r=2 and r=7. What did I do wrong?

2007-12-19 04:58:29 · 5 answers · asked by Nicholas L 1 in Mathematics

please, help

2007-12-19 04:56:09 · 5 answers · asked by sweets 1 in Mathematics

2007-12-19 04:56:02 · 3 answers · asked by Anonymous in Geography