Science & Mathematics - 30 September 2007

A billiard ball,.008kg at a speed of 10m/s hits another ball at rest after impact. The 2 balls move at an angle of 30degrees in the x axis. Find the speed of the balls after impact?

2007-09-30 23:34:20 · 1 answers · asked by clickfalcon 2 in Physics

2) What mass of Cu(NO3)2 is present in 276 mL of a 0.40 M solution? (Enter unit as g.)
3) What mass of KNO3 is needed to add to a 500 mL volumetric flask to produce a solution that is 0.40 M? (Enter unit as g.)
4) What is the molarity of a solution produced by dissolving 26 g of KI in a 1000 mL volumetric flask?(Enter unit as M.)

2007-09-30 23:32:27 · 2 answers · asked by KC 1 in Chemistry

and please tell me the types of acid and bases..
example:
grape:
Please give me as many as you can!

2007-09-30 23:17:59 · 2 answers · asked by Anonymous in Chemistry

(a) 15 workers take 6 days to assemble 3 cars. Find the number of workers needed to assemble 5 cars in 2 days.

Please explain and show your workings..Thanks...

2007-09-30 23:16:26 · 2 answers · asked by Anonymous in Mathematics

One Rectangular plate with length 8 inches breadth 11 inches and 2 inches thickness is there. What is the length of the circular rod with diameter 8 inches and equal to volume of rectangular plate ?

Ans: 3.5 inches

2. What is the Number of zeros at the end of the product of the numbers from 1 to 100.

2007-09-30 22:59:08 · 5 answers · asked by as 2 in Mathematics

W + X + Y + Z = 2

W + 2X + 2Y + 4Z = 1

W - X + Y + Z = 6

W - 3X - Y + Z = 2

I need to know what numbers represent the variables above. Please explain in as detailed a way as possible, how you arrived at the numbers, whether by using a calculator, or by hand. I have a TI-86, so if you are familiar with that calc, please tell me how to solve this, in as detailed a manner as possible, using a 4 x 4 matrix.

I am more or less an Algebra newb, so please don't be afraid to break this down into as simple a form as possible. Thanks.

2007-09-30 22:55:12 · 2 answers · asked by ducatitodd 1 in Mathematics

The coldess inhabitant place on earth is where.
not the country, i need d specific place

2007-09-30 22:45:42 · 7 answers · asked by Anonymous in Geography

The question is only for those who technically believe in pyramid shapes' capability in harnessing cosmic energy. A certain Filipino had already claimed that a triangle base is better that square base because it will not require alignment with the earth's direction.

2007-09-30 22:35:49 · 6 answers · asked by Manuel 1 in Astronomy & Space

Almost all resources of many types of foods come from natural materials. Natural resources however will be lesser in the future. Suggest how to overcome this problem.

2007-09-30 22:21:39 · 1 answers · asked by Vlary 1 in Earth Sciences & Geology

2007-09-30 22:18:16 · 2 answers · asked by aaaaa 2 in Astronomy & Space

why do we need squaring and square root in the process of fnding the distance between two points.

2007-09-30 22:17:54 · 4 answers · asked by sajesh.k 2 in Mathematics

H(x) = (4x^(2) + 5x^(-4))^3

H'(x) = ?

2007-09-30 22:16:37 · 2 answers · asked by Rrrr0001 1 in Mathematics

if it starts lighting in teh distance on a hot ummer night without any thunder or rain

2007-09-30 22:16:34 · 6 answers · asked by Anonymous in Weather

Please help me and show me how to do this problem!

2007-09-30 22:12:09 · 5 answers · asked by :) 2 in Physics

dust in a corner of the Universe , are we just microscopic germs floating in the macrocosm of an organism?

2007-09-30 21:58:30 · 5 answers · asked by Bob J 1 in Astronomy & Space

2007-09-30 21:56:18 · 3 answers · asked by Anonymous in Astronomy & Space

if so then how much

2007-09-30 21:47:48 · 4 answers · asked by Anonymous in Medicine

2007-09-30 21:44:58 · 1 answers · asked by Shankar 1 in Engineering

How to prove the theorems:
1)The lines joining the midpoints of opposite sides of rhombus forms a rectangle.
and
2)The lines joining midpoints of opposite sides of rectangle forms a rhombus.

Thank you in advance.

2007-09-30 21:42:09 · 1 answers · asked by tanmyboy 2 in Mathematics

1.What function is defined by P(x)=a (sub n) x^n + a(sub n-1) x^x-1 +.....a (sub 1) x+a?
2.Find the values of the constant A, B and C so that x(2x^3+7x-5)=Ax^4+bx^3+Cx^2-5x is an identity.
3. Given f(x)=x^4+4x^3+2x^2+x-3, find the remainder when f(x) is divided by x-1?
4. Factor 2x^3-5x^2-x+6 completely.
5. If (x+1) is a factor of a^2x^3+ax+2, find the value of a.
6. Draw the graph of y=x^3+x^2-2x by finding the x- and y- intercepts.
7. How many variations in sign are there in the polynomial x^4-5x^3+2x^2+4x-7?
8. How many roots does the equation 2x^8-7x^2-3x+1=0 have/
9. Give the complete set of possible rational roots of 2x^5-4x^3+7x+10=0.
10. What is m if x+3 is a factor of 3x^2+2x+m?

2007-09-30 21:36:37 · 1 answers · asked by jazz 1 in Mathematics

The first is taken from a lyaponav equation. I can't see where the jump comes from? The apostrophe is shown as a dot in the original source, presumably a derivative. what do i need to use chain rule?? I'm lost.

2007-09-30 21:36:06 · 3 answers · asked by Paine 6 in Mathematics

Approximate the area under the graph of, f(x)= e^(x/3) + 2. From x=0 to x=3 and above the x-axis using the left endpoints with n=4. Round the answer to two decimal place

2007-09-30 21:24:40 · 2 answers · asked by Nick 2 in Mathematics

If (a+b)^1/2 = (a-b)^-1/2(negative), which of the following must be true?

A. b = 0
B. a+b = 1
C. a-b = 1
D. a^2 + b^2 = 1
E. a^2 - b^2 = 1

2007-09-30 21:21:54 · 7 answers · asked by Anonymous in Mathematics

Fluorite, a mineral of calcium, is a compound of the metal with fluorine. Analysis shows that a 2.76 g sample of fluorite contains 1.49 g calcium. Calculate the following:

(a) mass (in g) of fluorine in the sample ___

(b) mass fraction of calcium and fluorine in fluorite

(c) mass percent of calcium and fluorine in fluorite

(Please explain it to a beginner step by step so that I can figure it out on my test tomorrow... first to answer correct and thorough gets best answer... thanks so much!)

2007-09-30 21:20:42 · 3 answers · asked by Anniepannie06 2 in Chemistry

when people say "we need to fight against the weather!" ,what do they actually mean by that??

2007-09-30 21:20:18 · 5 answers · asked by Anonymous in Weather

Approximate the area under the graph of, f(x)= e^(x/3) + 2. From x=0 to x=3 and above the x-axis using the left endpoints with n=4/ Round the answer to two decimal places.

2007-09-30 21:16:58 · 2 answers · asked by Nick 2 in Mathematics

I have no idea how to calculate free fall! What are the equations for it? And can somebody show me how to do these 2 equations:

A ball is thrown straight down with an inital speed of 20m/s. After 3 seconds, how fast is it going?

You shoot an arrow straight up at 50m/s. When will it run out of speed.

Please help!

2007-09-30 21:11:22 · 1 answers · asked by :) 2 in Physics

2007-09-30 21:06:42 · 4 answers · asked by ndungupatoh 1 in Mathematics

1. x^2+2x-2=0
2. x^2+10x+9=0
3. 2x^2+x-15=0
4. 2x^2+7x+3=0
5. x^2-10x-23=0
6. 4x^2-20x+25=0
7. x^2-6x+4=0
8. -3x^2+4x-12=0
9. -2x^2+8x=0
10. 2x^2+3x-20=0
11.3x^2-8x+3=0
12. 4x^2+20x+23=0
pls with complete solution....

2007-09-30 21:06:40 · 2 answers · asked by jazz 1 in Mathematics

2007-09-30 20:59:21 · 3 answers · asked by khem 1 in Mathematics