Science & Mathematics - 28 October 2007

Hi, any body plz help me how to determine the Gauss (internal & External) coeffs. in the geomagnetic potential equation, as IGRF provides Gauss coeffs of internal origin.

2007-10-28 23:55:33 · 1 answers · asked by Priya 1 in Earth Sciences & Geology

2007-10-28 23:41:22 · 4 answers · asked by swissbluche 1 in Other - Science

2007-10-28 23:39:28 · 9 answers · asked by sureshbabusintst 1 in Earth Sciences & Geology

2007-10-28 23:36:48 · 3 answers · asked by fuburyder14 1 in Chemistry

2007-10-28 23:00:12 · 8 answers · asked by J A S 4 in Physics

Is zoology a topic on its own or does it have seprate courses , say for example to be zookeeper what is the course called that is needed to do it (because i saw different ones involving vertabreates and other such things) and what are the name of the course/s

2007-10-28 22:31:48 · 5 answers · asked by Anonymous in Zoology

2007-10-28 22:29:37 · 7 answers · asked by I.Suresh N 1 in Physics

2007-10-28 22:25:27 · 6 answers · asked by A Swaroop 1 in Weather

Does a bigger brain imply a smarter person? or does the smaller brain works better ?

2007-10-28 22:24:22 · 5 answers · asked by Anonymous in Medicine

if they can survive a nuclear war?

2007-10-28 22:11:31 · 10 answers · asked by I dont know 4 in Earth Sciences & Geology

2007-10-28 22:11:07 · 6 answers · asked by Anonymous in Biology

I have this problem that I really don't get. It goes like this:

"Rex weighs 200 pounds on the surface of a planet that has the same radius as Earth but four times its mass. How much would Rex weigh on a planet that has the same mass as Earth but half its radius?"
A) 50 lbs B) 100 lbs C) 200 lbs D) 400 lbs E) 800 lbs

The formula you have to use is W = (Gm)/r^2
G= universal gravitational constant
W = weight, or force of gravity on the mass
m = mass
r ^2= radius squared

The answer is 200 lbs, but I don't get why. I tried using the formula and it doesn't work. Can anyone explain please????

2007-10-28 22:00:01 · 5 answers · asked by Exotic traveler 4 in Astronomy & Space

2007-10-28 21:53:20 · 4 answers · asked by Anonymous in Physics

For the following problem we are asked to find an equation for the conic that satisfies the given conditions:

Hyperbola, foci (2,2) and (6,2), asymptotes y = x – 2 and y = 6 – x

I know that the center is (4,2), the halfway point between the two foci, and thus that c = 2. However, I am not sure how to use the given asymptotes to find a and b to get the equation. Please explain how to do this part of the problem step-by-step.

2007-10-28 21:48:57 · 1 answers · asked by Ryan_1770 1 in Mathematics

For the following problem we are asked to find an equation for the conic that satisfies the given conditions:

1. Ellipse, foci (0, -1), (8, -1), vertex (9, -1)

For the solution I got:

[(x – 4)^2]/25 + [(y + 1)^2]/3 = 1

Is this correct?

2007-10-28 21:43:17 · 3 answers · asked by Ryan_1770 1 in Mathematics

2007-10-28 21:39:19 · 9 answers · asked by Anonymous in Biology

I was wondering what are the limits of how far we can zoom in on the micro universe? Could we ever expect to find an end to the structure of an atom? I keep thinking about the macro universe and there is seemingly no end could we expect this in the micro universe if someone developed a way to peer further into the atom?

2007-10-28 21:29:23 · 1 answers · asked by Balrog 2 in Physics

Nearly every primative society that engaged in any form of astrology (no matter how seperated from one another they were) predicts that the world will come to any end in the year 2012, when astronomers tell us some rare allignment of planets and stars occurs. However, this allignment has happened before several times in Earth's history, most recently some 13,000 years ago. Did anything significant happen then, or any of the other times when the coming cosmic allignment of 2012 happened in the past?

2007-10-28 21:14:30 · 14 answers · asked by foru0810 3 in Astronomy & Space

For this problem, we are asked to find the area of the region that lies inside the first curve and outside the second curve.

Note: I am using t instead of theta.

First curve: r = 2 + Sin(t)

Second curve: r = 3Sin(t)


I know pi/2 is one of the angles where these two curves intersect, but the problem is that I don’t know how to proceed from here since pi/2 is the only angle where these two curves are equal to one another for the interval between 0 and 2 pi. Please explain how to do the problem from this point forward step-by-step.

2007-10-28 21:09:34 · 3 answers · asked by Ryan_1770 1 in Mathematics

I have noticed that sometimes the moon is 100% lit for more than one day. Why is this ?

2007-10-28 21:02:10 · 2 answers · asked by TicToc.... 7 in Astronomy & Space

it is known that 40% of the students in a certain college are girls and 50% of the students are above the median height.if 2/3 of the boys are above median height,what is the probability that a randomly selected student who is below median height is a girl?

2007-10-28 20:59:42 · 5 answers · asked by Anonymous in Mathematics

rainbow quiz answer must contain a colour 10.

2007-10-28 20:55:56 · 2 answers · asked by SHIRL 1 in Botany

speed is 7.70m/s.

A.) Determine the magnitude of his acceleration ,assumed to be constant.

B.) If he ramp is inclined at 25degrees with respect to the ground,what is the component of his acceleration that is parallel to the ground?


I would gladly appreciate your help,thank you.

2007-10-28 20:51:36 · 1 answers · asked by Jay 1 in Physics

y'' - 5y' + 4y = 8e^(x) + x

2007-10-28 20:48:09 · 1 answers · asked by Anonymous in Mathematics

i made a standard blackpowder mix but when i tested it, it took a long tome to burn and there were yellow blobs like solidified sulfur. is my potassium nitrate unpure or is the sulfur actually plastic or something else?

2007-10-28 20:45:40 · 1 answers · asked by trigva2004 2 in Chemistry

The radius of a circular disk is given as 28 cm with a maximum error in measurement of 0.2 cm.

a) Use differentials to estimate the maximum error in the calculated area of the disk.

b) What is the relative error?

What is the percentage error?

2007-10-28 20:35:16 · 2 answers · asked by Ana 1 in Mathematics

An anemometer for measuring wind speed consists of four metal cups, each of mass m = 104 g, mounted on the ends of four essentially massless rods of length R= 0.3 m. The rods are at right angles to each other and the structure rigidly rotates at f = 12 rev/s. Treat the cups as point masses. What is the angular momentum of the anemometer about the rotation axis? I already figured out I is 37.44 but now I'm stuck anybody now what L is?

2007-10-28 20:33:32 · 2 answers · asked by c_me_run2005 2 in Physics

y" + 2y' + 2y = 0
y(1) = 1, y'(1) = 2

Okay... i was able to find the general solution to this problem, but since the initial values are given at 1 (which involves taking the values of sin1 and cos1....) i couldn't solve for the constant coefficients. Can anyone help?

2007-10-28 20:24:31 · 2 answers · asked by Tas Chowdhury 2 in Mathematics

and then it gets put backwards and goes like b_n =b_n-1+2b_n-2 ; where b0=1 and b1=2? How do you solve these?

2007-10-28 20:16:48 · 2 answers · asked by jimmy_castillo85 1 in Mathematics

okay i just heard from some guy on my question say a comet was coming tonight, can anyone tell me the time, i want to see it

2007-10-28 20:16:19 · 3 answers · asked by piano guy 2 in Astronomy & Space