Science & Mathematics - 11 September 2007

why is it chemical or physical?

2007-09-11 14:29:22 · 3 answers · asked by tha_chosen_one15 2 in Chemistry

is it the opposite of a black hole? does it spit out matter since black holes suck in matter? do they even exist?

2007-09-11 14:25:41 · 4 answers · asked by radical abe 1 in Astronomy & Space

An object fall from height h from rest and travels 0.5h in the last 1.00s. Find the time of its fall.

Thanks!

2007-09-11 14:23:01 · 6 answers · asked by Anonymous in Physics

how would I do this?
|x-4|<(or less than)2

2007-09-11 14:22:39 · 7 answers · asked by Kiwi 1 in Mathematics

Two SPHERICAL objects have the same mass. One floats on water; and the other sinks. Which Object has greater diameter?

2007-09-11 14:20:58 · 6 answers · asked by Nhat t 1 in Physics

I need a construction design and detail for Girth Flange to be used for Shell and Tube Heat Exchanger. Any good website?

2007-09-11 14:20:43 · 2 answers · asked by Darth Jhon 3 in Engineering

How much of each of the following substances would you add to water to prepare 1.90 L of a 0.50 M solution?

NiCl2 from the salt NiCl2·6 H2O

I got two answers, and don't know which one is right. Using sig figs, i got

1.2E2 or 2.3E2... which one's correct?

2007-09-11 14:20:34 · 1 answers · asked by Megan 1 in Chemistry

how do you find the domain of a function? example: the range is 0, infinity and the function is the square root of x-1. how woulf i find the domain. please help i have a big test tommorow.

2007-09-11 14:18:12 · 1 answers · asked by gym_class_heroes_fiend 2 in Mathematics

Suppose a treadmill has an average acceleration of 4.7 * 10^ -3 m/s^2

a) How much does its speed change after 5.0 min?
To find this I used the formula a=v/t (Acceleration = velocity / time) and when I solved it I got 1.41 m/s.

b) If the treadmill initial speed is 1.7 m/s, what will its final speed be?

In this second question I don't even know where to start. Can someone help me please?
Thank You! :D

2007-09-11 14:17:42 · 6 answers · asked by . 6 in Physics

Im really bad at math so Im asking for help.

If the measures of three angles of a triangle are 8x-6,5x +10,and x +8,then the triangle is?

a)obtuse
b)right
c)acute
d)isosceles
explain...

2007-09-11 14:17:39 · 7 answers · asked by ryan9944 1 in Mathematics

How do you do this with unit analysis?

2007-09-11 14:17:34 · 2 answers · asked by Anonymous in Chemistry

in what parts of the world is antimony found?

2007-09-11 14:13:58 · 5 answers · asked by Anonymous in Geography

Sketch six points A, B, C, D, E, and F, no three of which are collinear. Name the lines defined by these points. How many lines are there?

2007-09-11 14:13:37 · 8 answers · asked by Sethy P 1 in Mathematics

Question:
http://img401.imageshack.us/img401/7609/asdfec4.gif

on the right whats blurry is {p(n)}

and then for all integers n greater than or equal to 0

I have no idea what it means please help!

2007-09-11 14:13:32 · 3 answers · asked by sotkinghunter 1 in Mathematics

If f(x) = cos x and f(a) = 1/4 find the exact value of:

a) f(-a)

b) f(a)+f(a+2pi)+f(a-2pi)

2007-09-11 14:13:05 · 2 answers · asked by rickyricardoiscool 1 in Mathematics

2007-09-11 14:12:58 · 4 answers · asked by Mags 2 in Chemistry

okay..... let / mean dividing and - mean negative and minus. you will be able to tell if its a negative or minus.

and if you can i need the steps too.

1.[6+8(8/4)]-6

2. -7(2-(-1)-(-3)(4-9)

3. -8-2(-3)

4. 7-(-6)(-4)

5. -(-2)-4(3-2)

6. [5+16(24/8)]

7. 8(-1-3)-(-7)(-5-4)

8. -(4)-6(6-5)

9. -5-(-2)(6)

10. -(-7)-5(8-3)

11. -5(5+9)-1(9-7)


thats all.. and when a number like in number nine where it is like (-2)(6) in between the -2 and the 6 is an invisible times so you times them if they are like that with no sign inbetween them.

and if you are gonna say y dont you do this yourself dont.
cause i've done about fifty today. and im tired of them and im confused down to this point i just need help.

so please. help me.

2007-09-11 14:12:39 · 8 answers · asked by Anonymous in Mathematics

**2******1*******1***
--------+-------= --------
*X+1****3******X+1*

Solve the equation, if an equation has no solution indicate so please!
Need to know the steps to follow. Already have the answer here!

2007-09-11 14:11:44 · 2 answers · asked by Anonymous in Mathematics

Complete the square in x and y to find the center and the radius of the given circle.

(1/2x^2)+(1/2y^2)+(5/2x)+10y+5=0

Pls include all steps.

2007-09-11 14:11:29 · 1 answers · asked by Anonymous in Mathematics

do you have any examples of any?? ad what are their likes& differences?

2007-09-11 14:10:07 · 4 answers · asked by Kathleen 4 in Other - Science

If in America we see a solar eclipse how far away can other people see it.

2007-09-11 14:08:17 · 3 answers · asked by Anonymous in Astronomy & Space

2007-09-11 14:07:40 · 3 answers · asked by rmsboy51 1 in Physics

They said there goin be some big changes.

2007-09-11 14:07:38 · 10 answers · asked by Anonymous in Astronomy & Space

which zeros in each number are significant?
0.00471
0.0089
1000.1
0.00005
0.0076009
0.000008

sorry but im kinda still unsure

2007-09-11 14:06:44 · 7 answers · asked by =] 1 in Mathematics

hehe

2007-09-11 14:06:26 · 2 answers · asked by Anonymous in Paranormal Phenomena

a) copper metal can be bent into different shapes

b) a steel blade can scratch glass

c) alcohol boils at 60 degrees Celsius


All info welcome

2007-09-11 14:06:24 · 2 answers · asked by shiny 1 in Chemistry

say you have square root of -4; how do solve it..getting rid of the radical?

2007-09-11 14:05:29 · 6 answers · asked by GangGreen 2 in Mathematics

we heated a hydrated salt in a crucible with the lid on and the water was supposed to evaporate out.

2007-09-11 14:05:23 · 4 answers · asked by ylai 2 in Chemistry

is it possible to create a thermobaric explosion that would consume all the oxygen in the atmosphere?

If so what would be the effects (does it produce CO2 or CO)?

2007-09-11 14:03:40 · 3 answers · asked by delprofundo 3 in Physics

If given the radius in feet and the arclength in feet, how do I compute the change in coordinates from point A to point B on a two dimensional graph? This is a common occurence in land descriptions. I believe it is called a simple curve. I understand how to calculate the chord, but I don't know how figure the difference in coordinates between point A (e.g. x = 1000 and y = 900) and point B (x = ?, y = ?). Seems like there's a way to reduce it to a right triangle, but I can't see how.

2007-09-11 14:02:02 · 2 answers · asked by SomethinFishy 2 in Mathematics