Science & Mathematics - 26 December 2007

Im totally lost with this...Im going to copy the question word by word... Please help...Correct answer gets 10 pts..

A black hole is a region in space where objects seem to disappear.A formula in the study of black holes is the Schwarzchild formula.

R= 2GM
-------------
c^2


Based on the laws of logarithms, log B can be represented by

A)2 logG + logM - log 2c

B)log 2G + log M- log 2c

C)log 2+ log G+ log M - 2 log c

D)2 log GM- 2 log c


If you may, can you explain how you got to the answer. Thanks I appreciate it much.

2007-12-26 08:52:24 · 10 answers · asked by Anonymous in Mathematics

2007-12-26 08:46:46 · 8 answers · asked by D*Star 1 in Mathematics

How would you go about writing a balanced equation describing the reaction of sodium metal with water to produce hydrogen gas and sodium hydroxide?

-__-
Me + Chemistry = Stress
Also, if anyone is up to it:

Manganese metal can be prepared by the thermite process:
4Al(s) + 3MnO2(s) ---> 3Mn(l) + 2Al2O3(s)

Molar masses being:
4Al(s) = 26.98
3MnO2(s) = 86.94
3Mn(l) = 54.94
2Al2O3(s) = 101.96

a) If you start with 8 moles of Al, how many moles of Mn can be produced? (All other reactants are in excess.)
b)What mass of Al2O3 can be made from 200 g MnO2 and excess Al?

Any help is much appreciated.

2007-12-26 08:42:53 · 9 answers · asked by Anonymous in Chemistry

I I make a raspberry noise with my mouth while I look at the TV or the LED clock on the microwave, the TV picture and the Digits go wavy and start dance about. If I play about with the pitch of the sound, I can get some really extreme effects and get the numbers to bounce slowly about 10cm up and down in opposite directions in a Mexican wave pattern. Does anyone else know what I'm going on about and if so, how many people exactly will be making raspberry noises for the same purpose at any one instant? Thanks :)

2007-12-26 08:41:21 · 5 answers · asked by RedMistPete 4 in Paranormal Phenomena

What are the main things that I should know and practice before the big test?

I have about 2 1/2 weeks before the exam.....

2007-12-26 08:40:13 · 7 answers · asked by PS 1 in Mathematics

Can you prove that? Somebody would have found a theory that may prove that the earth is flat.

Do you say that the reason that people can't just walk off the earth and fall into space is because it's surrounded by a large mountain-chain covered with ice. It would take many guards to protect the whole chain. And who of you would voluntary have the job protecting the mountain chain?

I also heared that the flat earth theory is secret because the US-government earns huge amounts of money on it to financing space projects, etc.

2007-12-26 08:35:15 · 14 answers · asked by Anonymous in Astronomy & Space

is it found as the elements by itself, or in a compound?
please explain
thanks.

2007-12-26 08:32:52 · 8 answers · asked by Anonymous in Earth Sciences & Geology

2007-12-26 08:30:41 · 5 answers · asked by D*Star 1 in Mathematics

Apollo 11 started at 50,000 feet before it's desent. They almost knew to the exact foot even at 12 feet. They could not have used sound waves. Maybe two angles provided their measurements from the lander?

2007-12-26 08:30:07 · 13 answers · asked by Rebel 1 in Astronomy & Space

2007-12-26 08:29:40 · 10 answers · asked by Hayabusa 3 in Mathematics

please explain in detail...thank you

2007-12-26 08:29:24 · 8 answers · asked by Anonymous in Mathematics

2007-12-26 08:24:58 · 15 answers · asked by Anonymous in Astronomy & Space

My business is impacted by the weather on a day to day basis - specifically, when it's raining or very hot we get busier. I'm wondering if there is a resource available that will let me check the weather for dates in the past to help with current year business projections.

2007-12-26 08:21:10 · 5 answers · asked by Justin H 7 in Weather

2007-12-26 08:18:44 · 4 answers · asked by Anonymous in Geography

Given G=U(32)
and H= U_12(32)={1;17} then G/H is abelian group of order 16/2=8
which of the three abelian groups of order 8 is it
a)Z_8
b)Z_4 +Z_2
c)Z_2+Z_2

2007-12-26 07:56:31 · 1 answers · asked by Hynton C 3 in Mathematics

If they are born to a captive life shouldn't an animal be socalized so that if it ever does happen to get loose there is less of a risk that it would attack? The tiger attack in Sanfrancisco in AP news? What are your thoughts?

2007-12-26 07:50:42 · 13 answers · asked by Vivianna 4 in Zoology

The half-life if Actinium (227 Ac) is 22 years. What percent of a present amount of radioactive actinium will remain after 19 years?

2007-12-26 07:50:11 · 6 answers · asked by Anonymous in Mathematics

2007-12-26 07:50:08 · 9 answers · asked by Ladybug 4 in Astronomy & Space

2007-12-26 07:49:36 · 7 answers · asked by raven 1 in Physics

I am doing a science project on Sundials, where I validate the accuracy of the sundial in calculating solar noon, solar time, and altitude of the sun. What would be a nice, creative title for this project?

2007-12-26 07:48:38 · 7 answers · asked by The Sun 2 in Astronomy & Space

The way I see it, if you use a device that detects electromagnetic fields than you are associating the energy of spirits with that of electricity. Also, the theory that I understand is that you are picking up the energy of the ghost as it manifests. Where does this energy originate from? A ghost can not possibly create this energy, as energy can not be created or destroyed. This is basic physics. So one would have to deduce that the spirit is converting energy or deriving energy from another source. Then there is the fact that most rooms will have some sort of field present that could seem to have no source. So with this in mind, one could also deduce that either most rooms are haunted, or that rooms with a lack of detectable fields could be indicating the presence of spirits, as the spirits would be using the energy available in the room to "manifest" therefore, we would notice the absence of said energy. Has an EMF ever been directly connected to a full bodied apparition?

2007-12-26 07:48:01 · 12 answers · asked by roadrocker2000 2 in Paranormal Phenomena

2007-12-26 07:42:01 · 10 answers · asked by Anonymous in Geography

2. Use grouping to factor the polynomial completely: x^3+x^2-4x-4

3. Factor each polynomial cmpletely:6x^3y+30x^2y^2+36xy^3

4. Factor each Polnomial completely: 12t^3+14t^2+4t

5. Factor each polynomial: If prime stste so: 5max^2+20ma

6. Perform the indicated operation: 16a+8 / 5a^2+5 * 2a^2+a-1 / 4a^2-1

7. Perform the indicated operation: a^2+2a+1 / 3 / a^2-1/ a

8. Find the LCD for the given rational expression and convert each rational expression into an equivalant rational expression with the LCD as th e denominator: 3 / 8a^3b^9 * 5 / 6a2^2c
9. Perform the indicated operation. Reduce each anwer to lowest terms: 2a / a^2-9 + a/ a-3

10 Traveling Time. After leavig Moose Jaw, Hanson drove 200 kilometers at x km/hr and then discovered his speed by 20 km/hr and drove 240 additional kiloometers. Write a rational expression for his total traveling time . Evaluate the expression for x=100

2007-12-26 07:40:57 · 3 answers · asked by Anonymous in Mathematics

a -19
b 125
c 19
d 55

2007-12-26 07:39:29 · 3 answers · asked by Anonymous in Mathematics

me and my friends where having a little smoke session the other night , and one of the question that came up was why is there a temperature change during the winter? never payed too much attention in science class, so i was interested in findin out the reason behind it. Does it have anything to do with the position of the sun and the earth?

i don't know, i guess it's a better question than asking why a love seat is called a loveseat

2007-12-26 07:38:00 · 6 answers · asked by meursault j 1 in Weather

It is a right triangle and please explain how to do it. Thanks!

2007-12-26 07:37:59 · 7 answers · asked by staciaschool2 2 in Mathematics

2007-12-26 07:37:37 · 23 answers · asked by Anonymous in Astronomy & Space

My mother in law has a house in a foreign country and is looking for a in expensive way to heat a concrete block house (Total house including roof is concrete)

2007-12-26 07:31:53 · 3 answers · asked by Anonymous in Engineering

I know a place in Mill Hill Village, and also Dollis Hill somewhat. Both high on a hill.

2007-12-26 07:28:45 · 5 answers · asked by xwheres_homex 2 in Geography

It has been said that taking one asprin a day cuts the chance 34% chance of heart attacks in men, Well my husband is allergic to asprin does anyone know an alternative to asprin?

2007-12-26 07:26:34 · 7 answers · asked by Kelly M 3 in Medicine