Science & Mathematics - 31 October 2007

2007-10-31 07:07:41 · 1 answers · asked by Anonymous in Chemistry

2007-10-31 07:05:45 · 1 answers · asked by Razi 1 in Mathematics

2007-10-31 07:03:32 · 5 answers · asked by Anonymous in Physics

Two gliders have different masses. Glider 2 weighs 3 times as much as glider 1. Assuming glider 2 to be initially at rest as before, describe the final momentum in terms of the initial momentum, both in magnitude and direction for all vector quantities. Approximate the magnitudes of momentum.

m_2=3m_1

u_2=0

2007-10-31 07:02:25 · 1 answers · asked by pearlnruby89 1 in Physics

2007-10-31 07:02:06 · 6 answers · asked by Anonymous in Physics

(x^2/36)-(y^2/9)=1 at the point (-8,1/6sqrt(252)). The equation of this tangent line can be written in the form y=mx+b where
m=________
b=________

2007-10-31 07:01:20 · 3 answers · asked by Anonymous in Mathematics

2007-10-31 07:01:18 · 1 answers · asked by Anonymous in Chemistry

y=2x
x+3y=-14

2007-10-31 06:59:57 · 7 answers · asked by butterflt 1 in Mathematics

can you answer any of these??
1) 4x + 3 =2x + 11
2) 5x + 7 + 3x +11
3) 2x - 4 = 5x -19
4) 6x - 2 = 3x + 10
5) 7x + 4 +10x - 20
6) 9x + 7 = 15 + 1
7) 8x + 3 = 2x + 21
8) 3x - 6 = 10 - x
9) 2x -3 = 3 - 4x
10) 3x + 4 =18 - 4x
11) 10 - 4x =3x + 3
12) 9x - 3 = 19 - 2x

2007-10-31 06:58:29 · 21 answers · asked by Rushton 3 in Mathematics

2007-10-31 06:58:04 · 8 answers · asked by Anonymous in Astronomy & Space

2007-10-31 06:57:28 · 16 answers · asked by Chris B 1 in Mathematics

Lets say I have a 20.0 gram sample of aluminum, how many atoms of aluminum do I have. Im having a hard time figuring this out. Please help.

2007-10-31 06:57:19 · 3 answers · asked by Anonymous in Chemistry

i have no clue how to do it..
ex. 2.04 = ?

2007-10-31 06:56:11 · 5 answers · asked by soulsearcher1105 1 in Mathematics

p(x,y)=(4 x)(3 y)(2 3-x-y)/(9 3)
where (4 x) means number of comb. of x chosen from 4 items.

domain 0<=x<=3, 0<=y<=3, 1<=x+y<=3

find the cov(x, y)
please show me your solution with clear explanations
thank you. really want to learn

2007-10-31 06:52:04 · 1 answers · asked by Anonymous in Mathematics

For the tax yr 98-99 the p.allowance set against tax was £4045 for a single person. After this and any other allowances were deducted the first £4300 of income was taxed at 20%, the next £22800 was taxed at 23% and the rest at 40%. For a single person with no other allowances to deduct calcualte the tax paid on a salary of £15000 pounds p.a

2007-10-31 06:49:11 · 3 answers · asked by Anonymous in Mathematics

How do you show if the external direct product of Z_3 and Z_9 is isomorphic to Z_27?

2007-10-31 06:48:57 · 2 answers · asked by Anonymous in Mathematics

A ) bronchioles

B ) trachea

C ) bronchi

D ) alveoli

2007-10-31 06:48:47 · 4 answers · asked by Anonymous in Biology

2007-10-31 06:47:12 · 20 answers · asked by Anonymous in Zoology

2007-10-31 06:46:56 · 10 answers · asked by Anonymous in Astronomy & Space

I think we'll be looking back many years from now thinking about how fragile our spacestation, technology and dreams of space exploration were. We'll have several spacestation located throughout the galaxy, and small research colonies on the moon and possibly mars. Beyond that it's an endless quest for answers! Any thoughts?

2007-10-31 06:46:30 · 5 answers · asked by bdhartma 2 in Astronomy & Space

2007-10-31 06:46:13 · 13 answers · asked by Anonymous in Earth Sciences & Geology

x^2y^2-6xy=27
find a point (a,b) on the C with a>0 at which the tangent to C has the slope m=-1. give the coordinates of the point below:
a=________
b=________

2007-10-31 06:44:03 · 4 answers · asked by Anonymous in Mathematics

I need help finding the instantaneous rate of change of y with respect to x for the curve of

xe^y+x=xy

All help is greatly appreciated.

2007-10-31 06:41:09 · 8 answers · asked by Anonymous in Mathematics

2007-10-31 06:40:35 · 9 answers · asked by cupid blue 1 in Mathematics

2x+1+8x=6x+37
1(4x-6)=6
2(-2x-5)=-18
-1(-1x+1)=8
4(3x+9)=108
-2(2x-2)=-8

2007-10-31 06:35:44 · 7 answers · asked by Anonymous in Mathematics

2007-10-31 06:35:19 · 2 answers · asked by Anonymous in Mathematics

1/2x + 5 = x

in the back of our book we have the answers and it says 10 but i cant figure it out plz! help!

2007-10-31 06:34:31 · 6 answers · asked by ms-adidas 4 in Mathematics

i know joules is the measure of work but i am not sure how to calculate it,my teacher just wont help me ,please tell me each step to calculate these plz dont give me just the answer, i wanna learn how to do it.


when 25.0 grams of water are cooled from 20.0 cellcius to 10.0 celsius the number of joules of heat energy released is
a 42 b 105 c 840 d1050

how many kilojoules of heat energy are absorbed when 100.g of water are heated from 20.0c to 30.0 c by the addition of 3762 j. what is the mass of water? a0.03g b 30.0g
c 0.30 g d 300.0

2007-10-31 06:32:37 · 5 answers · asked by Anonymous in Chemistry

(g(x))^2+11x=x^2g(x) +22
and that g(2)=4, find g'(2).
g'(2)____________

2007-10-31 06:29:59 · 5 answers · asked by Anonymous in Mathematics

2007-10-31 06:29:58 · 2 answers · asked by Anonymous in Chemistry