Science & Mathematics - 31 August 2007

I am usually pretty good at math, but I am struggling. I have been out of school for 3 years now starting college this year. I'm not asking for answers--I need someone to please show me step by step how to simplify a radical...example Square root of 25. Square root of 45. How do I do it????? Please help

2007-08-31 15:45:26 · 6 answers · asked by Raven 2 in Mathematics

The equilibrium constant of the reaction A <--> 2B + C is 25.6 mol^2/L^2 at an unspecified temperature. The equilibrium concentrations in this system are [A]= 0.110 M, [B]= 1.78 M and [C]= 0.890 M. The reaction system is slugged with an additional amount of reactant, equal to a concentration of 0.270 M, instantaneously raising the [A] concentration to 0.380 M. The system then undergoes a shift and reestablishes equilibrium. Calculate the new equilibrium concentrations.


I'm trying to learn about chemical equilibria, and Le Châtelier’s principle; I think if I have the solution to this problem, it will a little bit more clear.

2007-08-31 15:44:47 · 2 answers · asked by Anonymous in Chemistry

2007-08-31 15:44:20 · 12 answers · asked by JAMES 4 in Medicine

I need an explaination for this.please help !

2007-08-31 15:41:48 · 7 answers · asked by ronamae 1 in Mathematics

stillness. But oh, it must be so cold! And what benefit could mankind get from this ringed planet? Does it have any precious minerals? I wonder?

http://www.space.com/php/multimedia/imagedisplay/img_display.php?pic=ig295_planets_solarsystem_02.jpg&cap=A%20controversial%20new%20proposal%20by%20the%20International%20Astronomical%20Union%20would%20reclassify%20an%20%3CA%20HREF%3Dhttp%3A%2F%2Fwww.space.com%2Fasteroids%2F%20class%3Dbottomnav%20target%3Dnew%3Easteroid%3C%2Fa%3E%20and%20a%20moon%20as%20%3CA%20HREF%3Dhttp%3A%2F%2Fwww.space.com%2Fplanets%2F%20class%3Dbottomnav%20target%3Dnew%3Eplanets%3C%2Fa%3E%2C%20plus%20add%20one%20far-out%20object.%20Here%27s%20the%20whole%20mix.%20Continue%20to%20see%20each%20of%20the%2012%20%22planets.%22%20Click%20to%20enlarge.

2007-08-31 15:41:46 · 13 answers · asked by Westbound 4 in Astronomy & Space

2007-08-31 15:40:26 · 16 answers · asked by Anonymous in Mathematics

Did anyone get to see Mars on Aug. 29th? I never got to :[

2007-08-31 15:39:36 · 6 answers · asked by Anonymous in Astronomy & Space

2007-08-31 15:38:12 · 7 answers · asked by SgtMoto 6 in Astronomy & Space

i cant use a calculator cus it doesnt show work so dont say havent u heard of a caualtor

2007-08-31 15:35:14 · 8 answers · asked by mona 1 in Mathematics

Delroy’s sailboat has two sails that are similar triangles. The larger sail has
sides of 10 feet, 24 feet, and 26 feet. If the shortest side of the smaller sail
measures 6 feet, what is the perimeter of the smaller sail?

(1) 15 ft (3) 60 ft
(2) 36 ft (4) 100 ft

2007-08-31 15:33:27 · 4 answers · asked by journey 1 in Mathematics

Is it possible that our solar system can be bigger then some galaxies?

2007-08-31 15:32:32 · 8 answers · asked by kimber loo 1 in Astronomy & Space

why are chemtrails only observed in certain countries, mostly north america and parts of europe.

2007-08-31 15:28:31 · 1 answers · asked by Anonymous in Weather

A body moving with uniform acceleration has a velocity of 15.5 cm/s when its x coordinate is 3.59 cm. If its x coordinate 1.87 seconds later is -8 cm, what is the magnitude of its acceleration?

Can you show your work too? Thanks.

2007-08-31 15:27:03 · 2 answers · asked by robert 6 in Physics

In a survey of 220 families planning vacations, 42 planned to vacation exclusively by boat, 37 auto only, 31 just by train, and 21 by plan only. 58 had booked the use of both auto and train, 47 had booked both train and plane, and 54 had booked both auto and plane.How many families planned to use cars, trains, and planes? How many families planned to use exactly two modes of transportation?

Help with solving the problem? Confusion ....

2007-08-31 15:22:14 · 4 answers · asked by Kate! 3 in Mathematics

2 cos^2= sin x + 1

I'm pretty sure I know what the answer is. So most likely I need the work shown. Because I had this question on my test today and I could only get the answer and of course you need to show your work so I probably got it wrong. So if you could just show the work that would help. Any and all different ways to solve the problem would be most helpful also.

2007-08-31 15:22:03 · 5 answers · asked by Hmmm Andrew ♣ 2 in Mathematics

Is the following correct?

1.) Permeability is the ability of a soil or aggregate to transmit fluids such as water and air that come into contact with it.

2.) Frost action will cause liquids contained in the pores of the soil to expand, pushing the soil particles upward, and hence, causing items embedded in the soil such as foundations to be pushed upward.

3.) The minimum safe depth that a foundation must be at in must be below the frost line to avoid causing the foundation to lift up. This depth is specified by the building code as .

Any thoughts?

2007-08-31 15:17:59 · 3 answers · asked by Confused about life 2 in Engineering

Besides the 2 Holidays what is supposed to happen?
My friend said something bad is supposed to happen..

2007-08-31 15:14:09 · 6 answers · asked by onedot.darling 4 in Astronomy & Space

From my 3 1/2 yr old who is learning to use the computer as a a learning/research tool. We couldn't find the answer from google, so thought we would try here.

Why in the mornings can you see the sun and moon at the same time. He beleives they are "having a conversation." If so, what are they talking about?????

vghhhukydsgabjkfckcjkcgmckbm,hbhjkbh,lnm,.bmn.bv mxvgghhhhhhhgffggrrgydyffffffffffffgfghghjk jhegfg (from the kid!!!)

2007-08-31 15:11:22 · 9 answers · asked by tomi_girl1 2 in Astronomy & Space

what is center taping of the TRANSFORMER?
plz solve the following problem.............
a 50 hz single phase transformerhas one primary winding and two secondary .the primary is rated as 22V and secondaries as 220V with a central taping and 600 V without any taping .for a net core area of 75 cm2.calculate the no. of turns of the three winding. max value of flux density is 1.2T ..

2007-08-31 15:09:52 · 3 answers · asked by chandra p 1 in Engineering

This would be 50 years since it was done with the first Appolo landing. Do you think that the first landing might have been fabricated during the cold war just to pump up the moral of the American people? To take 50 years to return with all the advances in technology seems suspicious to me. What is your opinion?

2007-08-31 15:09:33 · 11 answers · asked by Anonymous in Astronomy & Space

A survey of 62 restaurant patrons revealed that only 4 did not like either Mexican,Italian,or Chinese food. However, 18 liked both Italian and Mexican food,16 liked both Italian and Chinese food,and 18 liked both Chinese and Mexican food. If 33 patrons liked Italian food,31 liked Mexican food,and 36 liked Chinese food, how many liked all three types of food?How many like only one type of food?

Help :( confusing

2007-08-31 15:06:42 · 3 answers · asked by Kate! 3 in Mathematics

2007-08-31 15:05:19 · 10 answers · asked by bunaruma 1 in Astronomy & Space

What is the dimensions of the original square?

2007-08-31 15:03:44 · 6 answers · asked by Red 1 in Mathematics

2007-08-31 15:01:48 · 14 answers · asked by Jordan D 1 in Biology

It is said that in 10 or 20 years there will be millions more people on the earth than there are now. We are already struggling with resources; the fish have been depleted; the hole in the ozone is letting in radiation,etc.
Are you thinking about the future, as something quite bad with all the overpopulation? What do you think of this?
We are so focused on immediate problems, such as how to get out of Iraq, that we are not looking at the big picture. This whole planet seems to be going down the tubes.

2007-08-31 14:57:23 · 3 answers · asked by Anonymous in Earth Sciences & Geology

A record of travel along a straight path is as follows:
1. Start from rest with constant acceleration of 2.05 m/s2 for 20.0 s
2. Constant velocity for the next 2.70 min
3. Constant negative acceleration 8.77 m/s2 for 4.73 s
(a) What was the total displacement for the complete trip?
m
(b) What were the average speeds for legs 1, 2, and 3 of the trip as well as for the complete trip?
m/s
m/s
m/s
m/s

2007-08-31 14:54:09 · 3 answers · asked by ags101 2 in Physics

is it true cooking in microwave ovens is a serious health safety and risks issue? List some examples (from any personal experience) ??

2007-08-31 14:52:24 · 4 answers · asked by PikC 5 in Engineering

problem: find the point on the cirle (x-6)^2+(y-4)^2=25 where a line through (-4,-1) intersects the cirle and has the greatest slope. plz show work. thx

2007-08-31 14:50:52 · 2 answers · asked by NT 2 in Mathematics

2007-08-31 14:48:58 · 9 answers · asked by Anonymous in Astronomy & Space

2007-08-31 14:44:21 · 6 answers · asked by Anna H 2 in Astronomy & Space