Science & Mathematics - 16 October 2007

how would would the following affect the Mg/O ration in an experiment: would the ratio become larger or smaller than the true value? and why:

1.If not all the magnesium burned?
2. if not all the excess water aded was boiled away?

2007-10-16 17:23:41 · 1 answers · asked by truth88hurts 1 in Chemistry

2007-10-16 17:23:33 · 3 answers · asked by S i r i 1 in Medicine

A person pushes on a stationary 125 N box with 75 N at 30 degrees below the horizontal. The coefficient of static friction between the box and the horizontal floor is 0.80.

http://tinypic.com/fullsize.php?pic=2en3wvm&s=2

2007-10-16 17:21:00 · 1 answers · asked by sandymandy 1 in Physics

2007-10-16 17:20:22 · 1 answers · asked by Tahlyssa L 1 in Mathematics

A 90.0 L stainless steel container was charged with 4.00 atm of hydrogen gas and 5.00 atm of oxygen gas. A spark ignited the mixture, producing water. What is the pressure in the tank at a constant temperature of 25°C?

b. What is the pressure in the tank at a constant temperature of 125°C?

2007-10-16 17:17:39 · 1 answers · asked by Anonymous in Chemistry

in other words, what are the differences between sulfur and magnesium?

2007-10-16 17:17:17 · 1 answers · asked by azncutie45 2 in Earth Sciences & Geology

I was helping my mom compose questions for her physical science class using a pdf chart listing several unstable isotopes and information about their decay. After we finished, we saved the questions and failed to save the chart. We now have questions but the isotopes that are the correct answers are unknown. Could someone identify the isotopes by just their half-lives?

Here are the half-lives:
5 years
12 hours
27 min
20 min

2007-10-16 17:16:15 · 1 answers · asked by flyaway_far 2 in Chemistry

Electronic Voice Phenomena (EVP) is the term traditionally used to describe unexpected sounds or voices sometimes found on recording media. EVP initially involved audio tape recorders, but now, virtually any recording medium can be a vehicle for this phenomena. I am interested in your personal experience(s) with EVP. Thank you.

2007-10-16 17:13:23 · 12 answers · asked by lightningelemental 6 in Paranormal Phenomena

2007-10-16 17:13:22 · 4 answers · asked by Loving Love 1 in Medicine

Link to picture: http://www.alexanderhaberbush.com/100%5F0559.JPG

Exact species would be nice, but genus is OK too.

2007-10-16 17:13:09 · 2 answers · asked by Anonymous in Zoology

A 3.00kg ball is dropped from rest from the roof of a building 176.4m high. While the ball is falling, a horizontal wind exerts a constant force of 12.0N on the wall. How long does the ball take to hit the ground?

2007-10-16 17:12:01 · 2 answers · asked by jalisamarie12 1 in Physics

Two crates connected by a rope of negligible mass lie on a horizontal surface. (See the figure.) Crate A has mass x and crate B has mass y . The coefficient of kinetic friction between each crate and the surface is u. The crates are pulled to the right at a constant velocity of 3.2 m/s by a horizontal force .

in terms of x, y, and u find the magnitude and tension

http://tinypic.com/fullsize.php?pic=xp7odi&s=2

2007-10-16 17:10:13 · 1 answers · asked by kiranrai98 1 in Physics

Could Atlantis have been an alien space craft? I believe that it is possible and that's why we can't find it. If it was an alien mothership than that would explain why it could have been in many places around the world. It is said to be in many places around the world by different cultures in diferent parts of this planet. Where ever it was and what ever it was it was certainly more advanced than what we are today.
Is there anyone with there own theroies about Atlantis than I would like to hear from them.

2007-10-16 17:07:38 · 6 answers · asked by 711Shane 2 in Earth Sciences & Geology

2007-10-16 17:04:59 · 3 answers · asked by duuhhitzmaryy 3 in Medicine

why does star twinkle and the moon dosent? i would realy like to know. thanks

2007-10-16 17:03:22 · 22 answers · asked by Shakes 2 in Astronomy & Space

Why is Stephen Jay Gould’s view more unlikely to be racist than Darwin’s?

please explain

2007-10-16 17:00:44 · 3 answers · asked by Evermore 3 in Biology

Two objects of equal mass are on a turning wheel. Mass 1 is located at the rim of the wheel while mass 2 is located halfway between the rim and the axis of rotation. The wheel is rotating at a constant angular velocity. For each of the following statements select the correct option:

[The options for each blank are =, >, <, or cannot determine.]

For a given time, the angle covered by mass 1 is ____ mass 2.
The moment of inertia of mass 2 is ___ the moment of inertia of mass 1. (Both moments of inertia are taken about the axis of rotation.)
The speed of mass 2 is ____ mass 1.
The radial acceleration of mass 2 ____ the radial acceleration of mass 1.
The tangential acceleration of mass 2 ____ the tangential acceleration of mass 1.
For a given time, mass 1 travels a distance ____ mass 2.

2007-10-16 16:59:31 · 1 answers · asked by soulshifter_666 1 in Physics

blood red and discomfort

2007-10-16 16:59:08 · 5 answers · asked by JOSH G 1 in Medicine

2007-10-16 16:57:23 · 3 answers · asked by Jen 2 in Zoology

2007-10-16 16:56:25 · 5 answers · asked by Anonymous in Physics

2007-10-16 16:52:14 · 3 answers · asked by Anonymous in Botany

Helium is collected over water at 25*C and 1.00 atm total pressure.

2007-10-16 16:51:23 · 2 answers · asked by mark f 1 in Chemistry

2007-10-16 16:50:58 · 7 answers · asked by Anonymous in Mathematics

I need help to understand exactly what the paper talks about. I'm Leon's great-nephew, and I plan on taking up his work. I understand he mathamatically proved that Newman's machine was possible, and that you could propel objects around Earth with merely Gravity and the Coriolis Effect. I need explanations for these terms and the paper.

2007-10-16 16:50:25 · 2 answers · asked by Anonymous in Physics

2007-10-16 16:48:59 · 2 answers · asked by ns 1 in Chemistry

the __________ is a blank

2007-10-16 16:48:31 · 3 answers · asked by Carlo H 1 in Medicine

I read about this contest for making an automated machine that can dig so much dirt and move it to a certain spot autonomously for some kind of thing they're sending to either the moon or mars and was thinking why not just adapt some kind of machinery that already exists to work autonomously (Like a combine that uses GPS navigation). What would be the best piece of machinery to dig and move lots of dirt?

2007-10-16 16:47:43 · 1 answers · asked by Amanda B 2 in Earth Sciences & Geology

Submarines can dive from the surface of the water to depths of up to 1,200 feet, then can rise to the surface again, but why can they do this over and over again? When they put water in the compartments to sink the sub, where does the air go? When they pump out the compartments to rise to shallower depths, where does the air come from? After all, they are under water. So, how is a submarine able to do all of this?

Also, can anyone help me find a diagram from a website that explains all of this?

2007-10-16 16:47:07 · 2 answers · asked by Sarah S 3 in Physics

For example, I've heard my son say my name and he has avery deep recognizable voice...I've heard my boss laughing while I'm sitting at my desk and she is 1000 miles away on a business trip, but I know its' her laugh its sooo distinctive...sometimes it's a whisper, sometimes its loud...but I just don't have ANY idea what it could be...does anyone have ANY ideas?

2007-10-16 16:45:03 · 15 answers · asked by shannon b 1 in Paranormal Phenomena

In magnetic induction,

why is the outgoing peak of a graph higher than the incoming peak for one run??

please please help me with this!! thanks

2007-10-16 16:41:50 · 1 answers · asked by Anonymous in Physics