Science & Mathematics - 24 July 2007

an Erlenmeyer flask
a graduated cylinder
a volumetric pipet
none of the above

2007-07-24 04:39:13 · 3 answers · asked by notachemwiz 1 in Chemistry

NaOH?

H3O+(aq) + Cl-(aq) + Na+(aq) + OH- aq) ®
Na+(aq) + Cl-(aq) + 2H2O(l)
HCl(aq) + NaOH(aq) ® NaCl(aq) + H2O(l)
H3O+(aq) + OH-(aq) ® H2O(l)
none of these

2007-07-24 04:37:18 · 3 answers · asked by notachemwiz 1 in Chemistry

caught on film by newscrew

http://www.break.com/index/most-insightful-interview-ever.html

2007-07-24 04:34:18 · 14 answers · asked by Anonymous in Paranormal Phenomena

Radish
turnip
legume
sweet potato
mangroves
potato

2007-07-24 04:28:47 · 2 answers · asked by qwerty09 2 in Botany

If so please factor them.

x^4 - 3x^2 - 2x + 4

x^3 -2x^2 - x +2

2007-07-24 04:28:10 · 4 answers · asked by Anonymous in Mathematics

Sorta hard to ask that in the title. This is one of those problems which just wont go away. It annoys me, and i need an answer.

The problem in more detail is as follows:
There are three circles of radius 1, 2, 3
They are all touching each other, in such a way they leave an area between them
Within this area, draw the largest possible circle. What is the radius of this circle
Its actually an easy question using trig, the catch is there are no calculators allowed.

I came across this problem in a math competition i sat a year back or so, it was the last question so expect it to be hard.

This is what ive worked out, if youd rather try solve it for yourself then i guess dont read this.

At the point were the circles meet, the slope of the tangents are equal on both circles. Therefore you can connect two radii of two circles and pass through the touching point, making a 3 4 5 triangle.

With Pythagorean triples, the radius of the circle inscribed inside the triangle is given by
r=(a+b-c)

2007-07-24 04:23:57 · 4 answers · asked by priestincamo 2 in Mathematics

Write an equation in slope-intercept form of a line with the following characterisitcs; perpendicular to the graph of:
2x - 3y = 12 and passes through (4,3).

2007-07-24 04:16:40 · 6 answers · asked by Amber B 1 in Mathematics

what this pheromones do?can this perfume really attract female 100% succesfully?

2007-07-24 04:14:55 · 3 answers · asked by rempit k 1 in Medicine

2007-07-24 04:13:30 · 1 answers · asked by yamuna k 1 in Medicine

If money is worth 5% compounded semi-annually, find the present value of a sequence of 12 semi-annually of $500 each, the first is the due at the end of 4.5 years.
please show me the formula and solution to this problem...

2007-07-24 04:09:28 · 2 answers · asked by Dariel J 2 in Mathematics

I will put this with each of my questions today, I am out of school, I am trying to re-teach myself algebra which is a little difficult when you haven't done it in some time, so as I work through a problem I use yahoo answers to check it to see if I did it correctly. thank you for all your help :)


Write an equation in slope-intercept form of a line with the following characteristics: parallel to the graph of:
-4x + 3y = 12 and passes through the orgin.

2007-07-24 04:06:22 · 3 answers · asked by Amber B 1 in Mathematics

5 feet 4 inches:
Is is 5"4' or 5'4"

2007-07-24 04:04:21 · 15 answers · asked by ND 1 in Mathematics

2007-07-24 04:03:44 · 5 answers · asked by monster1832 1 in Astronomy & Space

I will put this with each of my questions today, I am out of school, I am trying to re-teach myself algebra which is a little difficult when you haven't done it in some time, so as I work through a problem I use yahoo answers to check it to see if I did it correctly. thank you for all your help :)

Write an equation in slope- intercept form of a line with the following characteristics. Perpendicular to the graph of:
y = 3/2x - 3 with a y-intercept of 5.

2007-07-24 04:02:58 · 3 answers · asked by Amber B 1 in Mathematics

bangalore

2007-07-24 04:01:53 · 14 answers · asked by Anonymous in Geography

I really need to know and I knew that Yahoo answers would help alot. I just hope that someone would answer my question correctly. Thanks.

2007-07-24 03:59:58 · 9 answers · asked by Andrea 1 in Astronomy & Space

Ms. Finch paid a 10% downpayment of $200,000 for a house and lot and agreed to pay the balance on monthly installments for 5 years at an interest rate of 15% compounded monthly. What is the monthly installment in in dollars? can you please give me the formula and solution to this problem...what is the formula used here?

2007-07-24 03:59:51 · 4 answers · asked by Dariel J 2 in Mathematics

2) Why wouldn't we use poly(ethene) to make these things?

a) saucepans
b) shoes
c) car windscreen

3) Write down the names of the polymer made from propene.

4) Poly(propene) is also strong and hard wearing. Explain why these two properties are important in a rope.

5) What happens to plastics in landfill sites? Explain your answer

6) Describe two other problems caused by plastics in the environment.

7) Scientists are developing some biodegradable plastics. Why do you think they are doing this?

8) Write down one problem of recycling plastics.

2007-07-24 03:59:30 · 1 answers · asked by Anonymous in Chemistry

I will put this with each of my questions today, I am out of school, I am trying to re-teach myself algebra which is a little difficult when you haven't done it in some time, so as I work through a problem I use yahoo answers to check it to see if I did it correctly. thank you for all your help :)

Determine the y-intercept of the graph: -3x-5y =15

2007-07-24 03:59:13 · 5 answers · asked by Amber B 1 in Mathematics

A transport plane takes off from a level runway with 2 gliders in tow. (3 planes, one behind the other). The mass of ea. glider in 765 Kg and the total resistance on EACH glider is 2543 N. While they are accelerating for takeoff, the tension in the towrope between the transport and first glider is 9876 N. What is the tension in the rope between the two gliders?

2007-07-24 03:57:33 · 2 answers · asked by geezuskreyest 5 in Physics

the question is about a operation we dont know
so for the sake of this we will call it operation $
heres the problem
if a $ b = b/a -1 then the value of (3$4) 4 (1$2) is...

2007-07-24 03:57:19 · 2 answers · asked by Anonymous in Mathematics

the vertex is -16, -2.

I need to know the correct equation and graphing for these vertexes.

2007-07-24 03:56:28 · 1 answers · asked by littlesoutherner12 1 in Mathematics

A thermometer of mass 31.0g and specific heat 620 J/kg C degrees is initially at a temperature of 12.0 degrees C. If the thermometer is then immersed in a sample of water of mass 119g and the combination reaches a final temperature of 41.5 degrees C, what was the initial temperature of the water?

2007-07-24 03:52:38 · 4 answers · asked by night_gazer86 1 in Physics

Hi,
What is the highest temerature achieveable by an electric heater? I think I read something about it being a few thousand degrees celssius.

Thanks.

2007-07-24 03:49:22 · 2 answers · asked by Anonymous in Other - Science

How much money you must invest in order to withdraw $2000 annually for 10 years if the interest rate is 9%? can you please show me the formula and solution to this problem..thanks...

2007-07-24 03:48:47 · 6 answers · asked by Dariel J 2 in Mathematics

please help!!

2007-07-24 03:48:33 · 8 answers · asked by ariel c 1 in Mathematics

2007-07-24 03:44:52 · 3 answers · asked by nik 1 in Earth Sciences & Geology

please help!!

2007-07-24 03:44:21 · 7 answers · asked by ariel c 1 in Mathematics

2007-07-24 03:44:21 · 15 answers · asked by happytramp 4 in Astronomy & Space

A carpenter installs a brand new, perfectly square door. The door hinges are standard, new and undamaged. The mortises in the door and door jamb for the hinges are perfect, so that the hinges are screwed in perfectly flush and exactly in the right places. Using a long level, the carpenter sees that all the door pins are perfectly colinear and vertical. Yet, he sees a tapering gap between the door and the door jamb, and that the door itself is out of plumb, i.e, rotated inside the door jamb opening. How is this possible? This should be a question in "Home and Garden", but this is actually more of a geometry problem. Before the carpenter can fix this problem, he first has to know what's causing the tapered gap, which is responsible for the door being out of plumb. Assume that the door is free swinging with a gap clearance all around the door. Is there a common geometrical explanation for this problem? To say that carpenter just did a sloppy job isn't helping anything.

2007-07-24 03:44:08 · 1 answers · asked by Scythian1950 7 in Mathematics