Science & Mathematics - 11 December 2007

I need balanced equations for: (#)=subscript
1. HCl
2. H(2)O(2)---->H(2)O+O(2)
3. Mg+HCl---->H(2)+ MgCl(2)
4. N(2)+3H(2)---->2NH(3)

2007-12-11 08:59:28 · 4 answers · asked by rocknroll_dragon 1 in Chemistry

Menelaus' Thoerem: Suppse there isa triangle ABC. If AF/FB * BD/DC * CE/EA = -1, then EDF is collinear.

How is it possible to have ratio of lengths be equal to -1 when multiplied together?

Please explain what this theorem means.

2007-12-11 08:59:09 · 3 answers · asked by UnknownD 6 in Mathematics

my son is working on meters or km and cm and inches

2007-12-11 08:58:40 · 3 answers · asked by Anonymous in Mathematics

I am looking for something that is gentle on concrete, yet will still work in sub-zero temperatures, possibly down to -20. What chemical/chemical blend will best have those properties? Thank you!

2007-12-11 08:58:09 · 2 answers · asked by Bec P 2 in Chemistry

i know if it were fired straight up the trajectory would be 0 meters/sec but i have NO clue how to figure out the speed at the top of trajectory would be if its fired at an angle.

explain please!!

2007-12-11 08:56:35 · 2 answers · asked by sharpieharpie 1 in Physics

In ΔGHL, K is the midpoint of segment LG, and J is the midpoint of segment LH. Find KJ.

KJ= 2x + 2

*This is the triangles corresponing base*
GH= 5x - 3

According to the Triangle Midsegment Theorem for any triangle -

The length of the midsegment is equal to one-half the length of its corresponding base.

But this problem is confusing, can someone please help me and answer this problem step by step and explain please.

You will be very helpful


Thanks

2007-12-11 08:55:45 · 3 answers · asked by Anonymous in Mathematics

A. tomato worm -- herbivore
B. tomato -- autotroph
C. blue jay -- primary consumer
D. hawk -- secondary consumer

2007-12-11 08:55:38 · 3 answers · asked by Aditya G 1 in Botany

1.State the effect of multiple replication forks on the speed of replication in eukaryotes.

2.If a mutation occurs during DNA replication in the formation of an egg or sperm cell, why is that mutation inherited?

2007-12-11 08:55:22 · 3 answers · asked by Mathⁿ 4 in Biology

2007-12-11 08:55:11 · 7 answers · asked by Anonymous in Astronomy & Space

2007-12-11 08:52:12 · 3 answers · asked by Anonymous in Earth Sciences & Geology

I Really Hate the weather in Tenessee.it's december and its 80 degress!!!!!

2007-12-11 08:51:46 · 7 answers · asked by ocean96girl 3 in Weather

if so write it in standard form
5y=-7x-8y

2007-12-11 08:50:42 · 6 answers · asked by Forevercool F 2 in Mathematics

At t = 0, a 715 g mass at rest on the end of a horizontal spring (k = 127 N/m) is struck by a hammer, which gives it an initial speed of 2.77 m/s.
1. Determine the period of the motion in seconds.
Determine the frequency of the motion.

2. Determine the amplitude.

3. Determine the maximum acceleration.

4. Determine the position as a function of time.
( ____ m ) sin[ ( _____ rad/s)t ]

5. Determine the total energy.

Any help regarding any of these numbers will be greatly appreciated. Please show all work. First person to get all answered correctly gets best answer. Thank you =).

2007-12-11 08:48:40 · 1 answers · asked by Anonymous in Physics

ok i have questions on Meiosis: - How many daughter cells are there? - What is the change in chromosome number? - Number of divisions? - what is the chromosome number in the daughter cells? - whats the difference between the parent and daughter cells? pleeeease help! thank you so much

2007-12-11 08:47:30 · 4 answers · asked by Anonymous in Biology

Last year at Christmas I saw one right at sunset; it was spectacular. Was it the elements in the meteor, or the atmoshere at sunset? Than you.

2007-12-11 08:47:26 · 4 answers · asked by ? 6 in Astronomy & Space

∫sin x cos x dx (pi,0)

2007-12-11 08:46:18 · 1 answers · asked by chuckgraduate05 1 in Mathematics

What are some cities/places that are found commonly that have 7 letters and start with L and ends with N

2007-12-11 08:44:33 · 5 answers · asked by coolqt101 2 in Geography

astronomy homework

2007-12-11 08:42:33 · 3 answers · asked by Ciera M 1 in Astronomy & Space

Do these apply to mitosis, meiosis, or both?

1. involves duplication of chromosomes
2. crossing over between homologous chromosomes may occur

2007-12-11 08:42:27 · 3 answers · asked by Marissa 2 in Biology

Since we always measure “C” no matter how we move, what happens to length, mass and time of a moving object by someone outside of the motion?

2007-12-11 08:41:49 · 2 answers · asked by Ciera M 1 in Astronomy & Space

Use the Laplace Transform to solve the given system of differential equations.

dx/dt = -x + y
dy/dt = 2x
x(0)=0, y(0)=1


THANKS!

2007-12-11 08:39:04 · 2 answers · asked by dtsairman 3 in Mathematics

http://answers.yahoo.com/question/index?qid=20071211132536AALgPBt

I thought that kinetic energy, and conservqation of mechanical energy is derived by integeraton of dynamic eqautions, but apparently there are new simplified approaches in modern teaching

2007-12-11 08:34:08 · 1 answers · asked by Alexander 6 in Physics

It freezing here!

2007-12-11 08:33:19 · 67 answers · asked by Anonymous in Weather

Is it the liquid water? Is it the gaseous atmosphere around the planet? minerals? Is it the life-forms and plants? OR Is it the genetic material in the form of DNA, RNA, chromosomes and genes etc of the life-forms and flora?

2007-12-11 08:33:16 · 13 answers · asked by Gee Waman 6 in Biology

A satellite is put into orbit at an altitude of 3x10^7 m above the ground. How fast will the satellite be moving? How do you figure out this problem?

2007-12-11 08:31:33 · 4 answers · asked by Kayla B 1 in Physics

Here it is:
When Carbon-containing compounds are burned in a limited amount of air, some CO as well as some CO2 is produced. A gaseous product mixture is 35.0 mass % CO and 65.0 mass % CO2. What is mass % of C in the mixture?

Now, for the mass of CO2 I got 46g and for CO I got 30g. Now, I have the formula, but whenever I use it I seem to get a weird answer. The formula was:
(Moles of X in formula x Molar Mass of X (g/mol)/mass (g) of 1 mol of compound) x 100

I plugged in 3 x 16/76g x 100 and got somewhere around 63%, but where does the 65 and 35% tie in!?!

If you can sort this out I would be much obliged. Thanks guys.

Merry Christmas!

2007-12-11 08:30:37 · 3 answers · asked by Anonymous in Chemistry

i looked at this american website and it had 11/10c as the time for one of its programmes

what does it mean???

2007-12-11 08:30:02 · 18 answers · asked by scary_cat x 2 in Other - Alternative

To what final volume should 100 mL of 4N H2SO4 be diluted to produce a 1M solution?

I got 200 mL H2SO4. Is this correct?

2007-12-11 08:29:50 · 3 answers · asked by katnap20 2 in Chemistry

2007-12-11 08:28:54 · 9 answers · asked by 2kool4u 5 in Astronomy & Space

I've been trying for about 2 weeks. Cannot get the answer. Pleae help if you can. thanks

A long horizontal wire carries a current of 48 A. A second wire, made of 2.5-mm-diameter copper wire and parallel to the first, is kept in suspension magnetically 15 cm below. See the figure below. (a) Determine the magnitude and direction of the current in the lower wire. (b) Is the lower wire in stable equilibrium? (c) Repeat parts (a) and (b) if the second wire is suspended 15 cm above the first due to the latter’s field.

2007-12-11 08:26:09 · 1 answers · asked by vkaar 2 in Physics