Science & Mathematics - 5 November 2007

1/2(4x+5)

if you could put a step-by-step instructions that would be nice, thanks.

2007-11-05 10:34:49 · 8 answers · asked by Anonymous in Mathematics

After falling downhill for half of the trip, how much further would it go uphill using its kinetic energy? (Assume magnetic suspension.) If the heat energy picked up underground could be used to charge batteries, could it make the whole trip without using external energy?

2007-11-05 10:33:20 · 4 answers · asked by marvinsussman@sbcglobal.net 6 in Engineering

Has anyone read the Cosmic Forces of Mu by James Churchward? Any interesting truths to be found there that might explain causes of gravity and the other 3 major forces of the universe? If there are 11 or 20 dimensions are we talking about physical dimensions? Or astral? Or something else? The mystics speak of many dimensions other than the 4 we know of the physical plane.

2007-11-05 10:31:53 · 4 answers · asked by Virginia G. 2 in Physics

If the big bang theory is true then could somebody possibly give me some information as to what created the bang. The concept of something being produced from nothing just seems too weird. pls help!!!

2007-11-05 10:30:32 · 7 answers · asked by anthony h 1 in Astronomy & Space

im doing a project on the element chlorine and i cant seem to find these online, can anyone help?

Ion it likes to form:
Reactivity and compounds it forms:
Estimated amount of element on earth:

and if you have any interesting facts thatd be good too :)

2007-11-05 10:30:24 · 3 answers · asked by christine 3 in Chemistry

2007-11-05 10:28:56 · 3 answers · asked by Graham M 2 in Biology

..the average family compact car doing average annual mileage OR the average family (2 adults + 2 children) just breathing for a year? (We can leave digestive gases out of the equations!) I have seen a calculation showing that they produce about the same...2.5 tonnes. Is this right? (..and pretty scary when you look at the impact of global population growth, irrespective of what we do to reduce industrial emissions!) Thanks for you replies.

2007-11-05 10:28:50 · 1 answers · asked by Anonymous in Other - Science

A ball of radius 0.212m rolls along a horizontal table top with a constant linear speed of 5.51m/s. The ball rolls off the edge and falls a vertical distance of 2.17m before hitting the floor. What is the angular displacement of the ball while it is in the air?

(I am not using this for a homework question but am studying questions from a textbook. It would be great if I could learn how to approach this question, thanks!)

2007-11-05 10:28:22 · 2 answers · asked by a.pasternak 2 in Physics

Does anyone know the exact rotational period?

2007-11-05 10:28:05 · 12 answers · asked by Anonymous in Astronomy & Space

I really want to know how to tell the bond length. I'm sure it's not like atomic radii, where you have two bonded atoms and see the distance from the two nuclei. In my book, it says that bond length is the average distance between two bonded atoms.

Also, Are double bonds stronger than single bonds?

Also, for resonance structures, for like SO2, why would there we more than one correct lewis structure. Can't you rotate the oxygens, so it's the same thing still?

If you could help, that would be awesome

2007-11-05 10:24:56 · 3 answers · asked by Anonymous in Chemistry

An 7.30-cm-diameter, 370 g sphere is released from rest at the top of a 1.50-m-long, 19.0 degree incline. It rolls, without slipping, to the bottom. What is the sphere's angular velocity at the bottom of the incline? What fraction of its kinetic energy is rotational?

2007-11-05 10:23:10 · 1 answers · asked by rochesmk 2 in Physics

what's so great about it?

2007-11-05 10:23:03 · 3 answers · asked by ★ Dee.. <다영> 2 in Earth Sciences & Geology

My roomate and I are debating wheather oxygen is released from water when boiled. I say that boiling would not break any oxygen from the H2O molecules. But, I realized maybe it would release the oxygen dissolved in the water, like what fish breath. What is the answer?

2007-11-05 10:20:14 · 5 answers · asked by Man of Action 3 in Chemistry

An oil refinery is located on the north bank of a straight river that is 1 km wide. A pipeline is to be constructed from the refinery to storage tanks located on the south bank of the river 5 km east of the refinery. The cost of laying pipe is $500,000 per km over land to a point P on the north bank and $1,000,000 per km under the river to the tanks. To minimize the cost of the pipeline, how far from the refinery should P be located? (Give your answer correct to two decimal places.)

2007-11-05 10:20:08 · 2 answers · asked by Jess 2 in Mathematics

I took some pictures of this plant that I found, and I was curious to know what plant this is

Here are the links:

http://www.flickr.com/photos/13606906@N04/1862773562/

http://www.flickr.com/photos/13606906@N04/1572429011/

http://www.flickr.com/photos/13606906@N04/1562409211/


What do you think of the pics?

Thank you !!!

2007-11-05 10:19:45 · 1 answers · asked by A 5 in Botany

If you had no eyelids, you wouldn't be able to blink and protect your eyes from outside debris...However, is sleep possible if someone has no eyelids?

2007-11-05 10:16:42 · 9 answers · asked by McGibblets 2 in Medicine

What are astronomer's best estimates of the total number of stars in the visible universe (about 10-12 billion light years in all directions)?
How many galaxies are there? What is the average number of stars per galaxy?

2007-11-05 10:16:22 · 6 answers · asked by Jeffrey K 7 in Astronomy & Space

Like n-propyl or n-butyl.

2007-11-05 10:13:16 · 2 answers · asked by Melissa 2 in Chemistry

Here is a picture of the puzzle
http://i22.tinypic.com/347v2wk.gif

Can anyone tell me the secret to cracking open this puzzle? It is not like most other kakuro puzzles, which can be solved without guessing or trial and error? Is there some special strategy to solving this without trial and error or guessing?

NOTE that I am not interested in the final solution. I could get that if I want to. What I want is tips and strategies.
Thank you.

2007-11-05 10:12:39 · 4 answers · asked by Dr D 7 in Mathematics

2007-11-05 10:12:31 · 3 answers · asked by Cherry 1 in Chemistry

and what does the m/s stand for?

2007-11-05 10:12:00 · 5 answers · asked by s 1 in Mathematics

Okay, so I have these two probs. w/answers.
(I cant type root symbol ,the little thing that looks like a check mark)
cubed(3) root of 64Pcubed(3)=4P
and
fourth(4) root of 16P to the 4th power=2IPI
Why is the 2 lPl in absolute value and not the 4P???????

2007-11-05 10:11:03 · 2 answers · asked by Anonymous in Mathematics

how do you find the mass of 100 cm of oxygen? how do you find the mass of 200cm of hydrogen?

2007-11-05 10:08:58 · 4 answers · asked by trccj 2 in Chemistry

I am working on this paper for Chem and would really appreciate some helpful opinions etc regarding nuclear technolgy.

2007-11-05 10:07:04 · 3 answers · asked by Flames Girl 3 in Engineering

a sample of magniesium metal was allowed to react with excess hydrochloric acid solution. the gas liberated was collected over water at 23degrees celceius. The volume of gas collected was 47.1 mL and the atmospheric pressure in the lab was 744 mm Hg. the vapor pressure of the water at 23 degrees is 21.1 mm Hg.

a) write a ballanced equation for the reaction described above.

b) what volume in mL would the gas occupy if it was dryed and stored at STP

c)determinethe mass of magneisium metal in grams that would need to be reacted to liberate the quantity of the gas collected above

tell the equations used in your calculations.

2007-11-05 10:03:22 · 2 answers · asked by daniel T 3 in Chemistry

f(x) = 2x^3 - 54x^2 + 480x - 1300

a) what are the critical values?

b) do they represent either a relative minima/maxima?

c) find the coordinates of any points of inflection

d) evaluate the function (coordinates) at the critical points

im totally stuck. i have no clue how to do this. id really appreciate any help/comments on this. thanks!!

2007-11-05 10:03:14 · 3 answers · asked by Mathema-what?! 1 in Mathematics

What is the speed of the stuck trucks? (hint momentum is conserved)

2007-11-05 10:00:02 · 1 answers · asked by Chris 1 in Physics

Pete slides a crate up a ramp at an angle of
27.6 degrees by exerting a 239 N force parallel to the
ramp. The crate moves at constant speed.
The cofficient of friction is 0.112.
How much work has been done against
gravity when the crate is raised a vertical
distance of 1.52 m? Answer in units of J.

2007-11-05 09:59:13 · 2 answers · asked by Handiman 3 in Physics

A Square is a rectangle, but rectangle is not a square. why this statement is correct can you think of another example of this type of statement using quadrilateral???

2007-11-05 09:54:07 · 7 answers · asked by Anonymous in Mathematics

"zones" meaning the eutrophic, bathyal, and abyssal zones

2007-11-05 09:54:06 · 1 answers · asked by Anonymous in Earth Sciences & Geology