Science & Mathematics - 3 September 2007

What's and algebraic inequality statement look like? Completely having a brain fart.
Oh, and the statement is about triangles, like wether the lengths will create a triangle or not...

thanks =)

2007-09-03 10:58:00 · 3 answers · asked by Shorty 2 in Mathematics

To make a buffer, you have to make it so the pKa of your weak acid is going to equal the pH right? (50 % dissociation)
My questions are:
(1) How do you do this....can you just put a solution of your weak acid into an already existing solution that has a pH close to that of your weak acid's pKa?
(2) If so, how does the mixing work, stoiciometrically? Like let's say, you want to mix 1 liter of 0.1 M of your weak acid into an already existing solution with a pH you want. (I'm thinking about this kind of in terms of biochemistry, like when somethng acidic enters a cell, rather than traditional methods of making buffers, as by titrating). Can you give me an example? using math, numbers, etc?
Because I'm thinking, if realistically, you add 1 L of your weak acid solution, to another liter of another solution, you'll have 2 liters. Wouldn't that change concentrations of either solution, or the buffer...if you made one? So this is where I'm confused, and need example

2007-09-03 10:54:07 · 1 answers · asked by Anonymous in Chemistry

Its not fair. It seems like every freckin planet out there has a problem on it.

2007-09-03 10:51:04 · 24 answers · asked by Anonymous in Astronomy & Space

Find the value of the variable and LM, if L is between N and M

NL=5x, LM=3x, and NL=15

2007-09-03 10:50:45 · 3 answers · asked by aiverson23@sbcglobal.net 1 in Mathematics

2007-09-03 10:50:15 · 6 answers · asked by Anonymous in Mathematics

A(n) is made up of points and has no thickness or width.

2007-09-03 10:49:21 · 1 answers · asked by Anonymous in Mathematics

like when would you need to use centimeters on an daily basis

2007-09-03 10:44:36 · 16 answers · asked by awesome 2 in Biology

heres the question:
Let F(x) = 3-x-x^2 (squared)

simplify F(x+h) - F(x)

any help is greatly appreciated

2007-09-03 10:42:44 · 4 answers · asked by kevin22345 1 in Mathematics

2007-09-03 10:39:16 · 15 answers · asked by Anonymous in Astronomy & Space

An airport has runways only 194 m long. a small plane must reach a ground speed of 42 m/s before it can become airborne. Whast average acceleration mus the planes engines provide if it is to take off safely from it airport?

2007-09-03 10:36:45 · 4 answers · asked by Tony N 1 in Physics

Hi all i cant solve this one
i got this function
F(x)=2x^4 -4x^2 +1
I draw it see link
http://gfdrxxx.tripod.com/a.jpg......

The question is this i wanna know the outline from A B C how do i calculate that?

2007-09-03 10:33:53 · 3 answers · asked by Anonymous in Mathematics

The charges and coordinates of two charged particles held fixed in an xy plane are q1 = +2.5 µC, x1 = 4.0 cm, y1 = 0.50 cm, and q2 = -4.0 µC, x2 = -2.0 cm, y2 = 1.5 cm.
(a) Find the magnitude of the electrostatic force on q2.
i got that to be 24.2 N
(b) Find the direction of this force.
° (counterclockwise from the +x axis)
(c) At what coordinates should a third charge q3 = +4.0 µC be placed such that the net electrostatic force on particle 3 due to particles 1 and 2 is zero?

2007-09-03 10:32:51 · 2 answers · asked by Anonymous in Physics

hi there are some hazel trees growing at the bottom of the garden and for the first time since they were sown ..about 10 years ago..there seams to be a largish crops appearing.
Some have dropped off already due to the wind..if i gather these "windfall" nuts will they ripen ..otherwise when should the nuts on the trees be ready to crack open ?

2007-09-03 10:31:36 · 5 answers · asked by fozzy_bear_61 1 in Botany

You are studying standing sound waves in an organ pipe of length L with both ends open. What wavelengths of sound can exist as standing waves in this pipe? Express your answer in terms of the length L.

For this I had lambda = (3L) / 2. The question also asks for an organ pipe of length L with one end open and one end closed but I don't know (maybe 5L / 2??).

2007-09-03 10:31:16 · 1 answers · asked by Anonymous in Physics

A hot dog bun (volume 240 cm3) with a density of 0.15 g/cm3 is crushed in a picnic cooler into a volume of 195 cm3.what is the new density of the bun?

2007-09-03 10:30:24 · 2 answers · asked by Anonymous in Chemistry

A helicopter is ascending vertically 5.5m/s. At a height of 105 above the earth, a package is dropped. How much time does it tkae for the packs to reach the ground?

- And -

Bond is standing on a bridge, 10m above the road below. He spots a flatbed truck loaded with mattreses approaching at 30m/s, which he measures that the telephone poles the truck is passing by are 20m apart. The bed of the truck is 1.5m above the road, and Bond quickly calculates how many poles away the truck should be when he jumps down the bridge onto the truck. How many poles is it?

Please show all work too, I am really confused. Thanks!

2007-09-03 10:30:17 · 1 answers · asked by metro900 3 in Physics

I have this question on my science homework assignment but I can't find the answer in the book.

2007-09-03 10:23:55 · 6 answers · asked by Anonymous in Earth Sciences & Geology

12 student belong to a club that met last week. If the ratio of student absent to students present was 1 to 5, how many student were absent?

Thank you so much!!

2007-09-03 10:18:17 · 9 answers · asked by Padfoot 2 in Mathematics

2007-09-03 10:17:47 · 2 answers · asked by Anonymous in Physics

uhh if GH is 1 line, and D is the midpoint...and if GH= 4x-1, and D=8 then shouldnt GH's value be 16? making it uhh x=3.75 or 3 3/4..Right?

2007-09-03 10:12:45 · 4 answers · asked by Anonymous in Mathematics

1. Beryllium (1st level: 4 protons; 5 neutrons) (2nd level: 2 electrons) (3rd level: 2 electrons)

2. Oxygen (1st level: 8 protons; 8 neutrons) (2nd level: 2 electrons) (3rd level: 6 electrons)

2007-09-03 10:10:24 · 2 answers · asked by Thursday 1 in Biology

regarding the origin of earth and what is presently happening in the universe. They have shown spectacular videos of the formation of various stars, and galaxies and other heavenly bodies however, were these real? No one seemed to discount what these people were saying. Or were all these simply theoretical.

2007-09-03 10:09:48 · 14 answers · asked by Don S 5 in Astronomy & Space

Factor
x (2a+3) -y (2a + 3)

2007-09-03 10:07:44 · 6 answers · asked by BC 2 in Mathematics

this might cost a bit but like the man said you get what you pay for,space panels should be a thing of the past ! one solid part ,or even the whole shuttel if not just the bottom of the craft.

2007-09-03 10:06:01 · 4 answers · asked by Anonymous in Engineering

2007-09-03 10:01:22 · 6 answers · asked by Anonymous in Mathematics

since the centrafugal force at the equator must counteract the gravity to certain amount? or shouldn't it ??

2007-09-03 10:01:11 · 12 answers · asked by rastgoo_2 2 in Astronomy & Space

We are not sure the answer for this is correct in the ACT answer book, so I am asking for clarification. (it is not for homework)
One hot-air balloon is 10 kilometers (km) east and 3 km north of an airport tower while a second hot-air balloon at the same altitude is 2 km west and 5 km south of the same airport. Approximately how many km separate the 2 hot-air balloons?
A. 8.2
B. 12
C. 14.4
D. 15.8
E. 20
Thanks in advance for your help.

2007-09-03 09:59:00 · 4 answers · asked by ddot2882 6 in Mathematics

A controlled experiment is one where you subject your hypothisies to a seris of tests while controlling many variables but i need an example

2007-09-03 09:58:26 · 3 answers · asked by Emily G 1 in Physics

2007-09-03 09:57:41 · 2 answers · asked by X 1 in Physics

___V___ - _8_
(v^2-2v-3) (v+1)

2007-09-03 09:51:29 · 2 answers · asked by k-co 1 in Mathematics