Science & Mathematics - 15 November 2007

I am a little confused about just how it works with regard to current flow. As far as I know, current flows from the negative pole to the positive, because electrons are attracted to the positive source.

Looking at power lines, I know the voltage is "stepped down" from high voltage carrier lines, to substations, and stepped down again before it gets to a house. Every pole has a ground wire run into the earth, which is the negative. My question is, then isn't the truth that, since the ground is the negative end, that the electricity should be flowing in the opposite direction, and that the voltage is actually "stepped up"?

Also, the truth is that if you touch one wire and not the ground, you don't get zapped. If the current is coming from the ground, and not trying to get to the ground, why can we safely touch the bare ground wire on poles?

2007-11-15 06:06:40 · 5 answers · asked by messenger_of_the_void 2 in Physics

2007-11-15 06:06:01 · 5 answers · asked by Alexander 6 in Physics

Who's concerned about Planet Nibiru when it's in our solar system in afew years.Is 2/3 of the world at least gonna be wiped out as predicted?
Personally I'm looking foward to it!

2007-11-15 06:03:07 · 9 answers · asked by Anonymous in Astronomy & Space

can you specify in what you say? please

2007-11-15 06:02:42 · 4 answers · asked by Jac 1 in Chemistry

In meiosis, the chromosomes replicate only once in the preceding interphase.

All the events unique to meiosis occur during meiosis I.

Meiosis provides for asexual reproduction.

In mitosis, the chromosomes replicate only once in the preceding interphase.

Mitosis provides for growth and tissue repair.

2007-11-15 06:01:03 · 2 answers · asked by Scigirl 3 in Biology

2007-11-15 05:59:43 · 7 answers · asked by Anonymous in Physics

If a coin is flipped 3 times, and 2 out of those three times it comes up heads, what is the probability the second time it is flipped it comes up heads?

2007-11-15 05:59:20 · 6 answers · asked by MrV 2 in Mathematics

give your answer in the simplest form

I'm stuck on this question...I tried completing the square but I got x = -2 + or - the sqroot of 4.5 and the answer is supposed to be x = -2 + or - 0.5xthe sqroot of 26

2007-11-15 05:54:29 · 2 answers · asked by Anonymous in Mathematics

2007-11-15 05:54:12 · 10 answers · asked by sehrish_8 1 in Other - Science

Just wondering what people thought of the paranormal...and if anyone has had their own paranormal experience?? and if so did make you more curious?? or what to find out more?? or did it just freak you out and you want nothing to do with it?? Thanks.!>!>!>!>!

2007-11-15 05:53:44 · 12 answers · asked by happycoder225 1 in Paranormal Phenomena

Use the point-slope form of the linear equation to find an equation of the line with the given slope and passing through the given point. Then write the equation in standard form.

Slope -4; through (-7, -5)

2007-11-15 05:52:24 · 5 answers · asked by . 1 in Mathematics

for any integer n>2 show that there are at least 2 elements in U-n
that satesfies
x^2=1
U-n"is agroup under multiblication modulu n;

2007-11-15 05:50:53 · 2 answers · asked by Dana S 1 in Mathematics

I feel stupid asking this question but what is the derivitive of x^(1/x)

2007-11-15 05:48:25 · 4 answers · asked by jazzyrhythms 3 in Mathematics

1. Some cooking oils contain both saturated and unsaturated fats. The amount of unsaturated fat is determined by the iodine number of the fat mixture. Saturated fat has a iodine number of 0 – 2. Unsaturated fats may have iodine numbers of 50 – 100. What property of unsaturated fats allows for a high iodine number?

2. Soap is the sodium salt of a fatty acid. Millions of bars of soap are produced every year in the USA. Where do soap manufacturers obtain fats for the manufacture of soap?

2007-11-15 05:47:35 · 1 answers · asked by shashank 2 in Chemistry

Through (-5, 4), perpendicular to the y-axis

2007-11-15 05:46:57 · 2 answers · asked by . 1 in Mathematics

When a sea horse sees a predator, its nervous system kicks into high gear. Which structure is responsible for transmitting signals from one nerve cell to the next?
a) Golgi body
b) nucleus
c)ribosome
d)cell membrane

2007-11-15 05:46:02 · 3 answers · asked by Anonymous in Biology

4. In a tug-of war between the teams A and B, the rope breaks at a point which is nearer to A. Then
Answer : A has applied more force.

Please explain the answer.

Thanks.

2007-11-15 05:45:59 · 1 answers · asked by Prashant Kumar 1 in Physics

If a cannonball is fired from a tall mountain, gravity changes its speed all along its trajectory. But if it is fired fast enough to go into circular orbit, gravity does not change its speed at all. Why?

2007-11-15 05:45:24 · 5 answers · asked by Anonymous in Physics

2007-11-15 05:45:17 · 13 answers · asked by Lydia 3 in Mathematics

1. A stone S is tied to the middle of a string and suspended from one end O. If you give a sharp jerk at P, the other end of the string, then the string will break
Answer : below the stone

2. In the above problem, if we increase the pull at P gradually, the string will break
Answer : above the stone

Please explain the answers. It has got something to do with inertia.

Thanks.

2007-11-15 05:44:43 · 2 answers · asked by Prashant Kumar 1 in Physics

Despite its name, the Pacific sea horse is actually a type of fish. Its horse-shaped head gives it its name. This creature lives in the Pacific waters off the west coast of the Americas, from Peru to Southern California. Like many other ocean fish, sea horses face the constant challenge of losing water to their saltier environment.

When a Pacific sea horse’s body loses water to its environment, which process is responsible?
a) active transport
b) osmosis
c) endocytosis
d) exocytosis
When the sea horse eats a meal, its body breaks down organic molecules in the food. Some of those molecules enter cellular respiration, which ultimately produces the molecule ATP. In which part of the sea horse’s cells is ATP produced?
a) mitochondria
b)Golgi bodies
c)vacuoles
d)lysosomes
Help?

2007-11-15 05:44:27 · 3 answers · asked by Anonymous in Biology

Why does the force of gravity do no work on a satellite in circular orbit, but does do work on a satellite in elliptical orbit?

2007-11-15 05:44:25 · 3 answers · asked by Anonymous in Physics

2007-11-15 05:44:14 · 5 answers · asked by jessika 4 in Mathematics

i know the basics like electrons,neutrons, and protons and stuff. but i wanna know the others. if you could tell me even just one or website where i could find them, that would be great!

2007-11-15 05:44:12 · 1 answers · asked by Ne-ne 1 in Chemistry

How much heat is released when a mixture containing 24.7 g of CS2 and 100.0 g Cl2 reacts by the following equation

CS2(g) + 3Cl2(g) S2Cl2(g) + CCl4(g); ΔH = -230. kJ

2007-11-15 05:43:45 · 2 answers · asked by Bernie 1 in Chemistry

Syn gas contains CO and H2 so I do not want to lose any/much of these two but would like to know what the best aqueous/organic solvent.

References would be appreciated.

2007-11-15 05:37:48 · 3 answers · asked by Anonymous in Engineering

I'm making an essay on the mediterranean zone and i can't find enough information. Help?

2007-11-15 05:33:27 · 5 answers · asked by Anonymous in Geography

here: it's 11:26am (montana, USA)

2007-11-15 05:26:58 · 11 answers · asked by Anonymous in Geography

hahaha i love these! This time, try to solve using Matrices! :

In 1990, the aquariums with the greatest attendence were the sea Worlds in Florida, California, and texas. The total attendance for all three was 10.2 million. Sea World of Florida had 0.3 million more than Sea World of California. Sea World of Cailfornia had 1.2 million more than Sea World of Texas. What was the 1990 attendance of each?

2007-11-15 05:26:49 · 5 answers · asked by Laura 1 in Mathematics

she is taking hydrocodone,lisipriol, xanax, soma,ambian

2007-11-15 05:25:16 · 3 answers · asked by Anonymous in Medicine