Science & Mathematics - 28 January 2007

and if so, how?

2007-01-28 03:01:05 · 7 answers · asked by Flashbark 2 in Astronomy & Space

A person is charged $20 to select one bill. find the expectation. is the game fair?

2007-01-28 03:00:02 · 6 answers · asked by Anonymous in Mathematics

What country has the only tropical rainforest in the northern hemisphere?


NOTE: I NEED THE COUNTRY, NOT THE FOREST.

2007-01-28 02:59:54 · 6 answers · asked by Anonymous in Geography

2007-01-28 02:57:15 · 2 answers · asked by Olivia 4 in Mathematics

|2x + 3| - 6 = 11

?

2007-01-28 02:56:44 · 11 answers · asked by Amanda W 2 in Mathematics

I have a question regarding the energy needed to raise an electron a level (from level 2 to level 3). I'm pretty sure you use the equation (E = -Rhc/n^2) but I'm not sure which number to put into the "n" value, and better yet, I'm getting an answer that isn't on the sheet for either using 2 or 3 for the n value! Is there something wrong w/ this equation or am I doing something wrong?

2007-01-28 02:56:19 · 2 answers · asked by Matt B 3 in Chemistry

or is it confined within the limits of the cell?

2007-01-28 02:54:19 · 3 answers · asked by Allen S 2 in Biology

A veterinarian has 500 feet of fencing suitable for making animal runs. He wants to use it all to fence in a rectangular area with three interior fences running from end to end of the rectangular area so that four parallel rectangular runs are made for his larger animals. If he builds so that the overall area is maximized, what will be the longer dimension of each run?

2007-01-28 02:54:16 · 3 answers · asked by Anonymous in Mathematics

A 1.20 kg toaster is not plugged in. The coefficient of static friction between the toaster and a horizontal countertop is 0.370. To make the toaster start moving, you carelessly pull on its electric cord. For the cord tension to be as small as possible, you should pull at what angle above the horizontal?

Does anyone know how to solve this question?

2007-01-28 02:53:10 · 3 answers · asked by jkl 1 in Physics

i aslo came up with -3 < x < 4


or is it another solution?

2007-01-28 02:51:54 · 2 answers · asked by Doug 2 in Mathematics

I'm an author. I have a character who is being held hostage in a garage. It's winter in Merced California so it could get down to freezing but more likely will be low 40's at night to mid 50's in the daytime. He is restrained in a chair so can't move around. Need an idea how long before his core temp would drop below 95 degrees. Might there be an equation for figuring this. Where might I look for an answer?

2007-01-28 02:50:59 · 2 answers · asked by Jaxine 2 in Medicine

2007-01-28 02:50:23 · 4 answers · asked by emi 3 in Other - Science

At what rate, in stere per minute, is the volume of a sphere increasing if the radius of the sphere is two meters in length and is increasing at a rate of three meters per minute.

possible solutions...

32pi

48pi

72pi

108pi

or could it be none of these?

2007-01-28 02:48:02 · 1 answers · asked by chris 2 in Mathematics

2007-01-28 02:47:14 · 8 answers · asked by Anonymous in Astronomy & Space

what volume is required

2007-01-28 02:45:16 · 4 answers · asked by TC 1 in Medicine

I am trying to Figure out a good Career and i only know of a few kinds of ordinary doctors. I just am trying to figure out what kind of Different doctors there are in the world.

2007-01-28 02:45:03 · 3 answers · asked by OMG! its her 1 in Medicine

. . = x^2 + 3, if x < 0
. . = 0, if x = 0
f(x) = x^2 - 3 if 0 < x < 2
. . = 1 if x = 2
. . = x^3 - 7 if 2 < x

Then lim f(x) =
. .. . . x=>0+

2007-01-28 02:43:57 · 3 answers · asked by Olivia 4 in Mathematics

I'm always in the dark when it comes to things like the copyright dates of movies, which Superbowl this is, etc. How do you read and use them? Please give me a quick tutorial!

2007-01-28 02:41:14 · 8 answers · asked by Anonymous in Mathematics

2007-01-28 02:41:03 · 7 answers · asked by TC 1 in Chemistry

I am taking probability classes. It is a hard subject for me. How do I increase my skills in it. Any website that can help me or text book? Please help!!

2007-01-28 02:40:57 · 3 answers · asked by Lotus 2 in Mathematics

possible solutions...

(2/x)(x + 1)(x + ln x)

(2/x)(1 + ln x)

(2/x)(x + 2)(x + 2 ln x)

(2/x)(x + 2 ln x)

(4/x)(1 + 2 ln x)

(4/x)(x + 2)(x + 2 ln x)

2007-01-28 02:40:41 · 5 answers · asked by chris 2 in Mathematics

Find the derivative of the function:

y=sin(3x^1/3)+(sin(4x))^1/3

2007-01-28 02:38:04 · 1 answers · asked by dudeman 1 in Mathematics

I know the answer to this exercise but I am not sure which are the values that were used to come to that answer.

Ok I have to find this limit.

lim (x^2-3x+1)
x->2


The answer is -1/2

but I need the values for that answer, that are the numbers that are closer to -1, and that's where I am stuck. I need at least 4 values. I think is 0.099, 0.99, etc....but I am not getting the correct answer which is suppose to give -1/2.


Please help. Thanks.

2007-01-28 02:37:51 · 2 answers · asked by Anonymous in Mathematics

2007-01-28 02:37:37 · 5 answers · asked by TC 1 in Medicine

What is ∫3√(1+x^(-1))dx on the interval from 0 to 3

2007-01-28 02:37:36 · 3 answers · asked by Jim R 1 in Mathematics

lim . . . .. . (x^2 - 9)/(x^3 - 27)
x=>3

2007-01-28 02:37:21 · 2 answers · asked by Olivia 4 in Mathematics

The mathematical point makes mathematics absurd and meaningless . The mathematical point is a non dimentional nothing and as such it dont exist. Calculus sums all these points-that dont exist -along aline to give something -its leangth But this is absurd and self-contradictory so calculus is and absurd meaningless method -which gives resulkts -but is in fact built on an imposiblity ie suming nothings That is why this author says mathematics is meaningless What do you think
http://gamahucherpress.yellowgum.com/gamahucher_press_catalogue.htm

2007-01-28 02:36:25 · 3 answers · asked by Anonymous in Mathematics

For a SF piece I'm using the humans have a shodily run ming colony at Sirus A. (The mining co uses lack of regulations to make a profit.)

The aliens have a colony on Altair.

But I don't know if that is on the other side. I want it close and can change star systems. Oh I need a 4th star system where the aliens started. same problem.

2007-01-28 02:36:20 · 4 answers · asked by Anonymous in Astronomy & Space

Some say that the Sun does not lose energies, only its energy are transformed. Others say that the Hydrogen of the Sun is burnt and transformed into helium, equal the millions of atomic bombs blowing up, but it ignores that the bombs do not remain unbroken as the Sun. Others say that the Sun anger to erase to the 10 million years for loses of energies. Still others speak that the Sun and the surplus of the explosion of the Big Bang.

2007-01-28 02:35:07 · 4 answers · asked by britotarcisio 6 in Astronomy & Space

For all values for which the expressions are defined, sec x - tan x and

.. . . . . 1
__________
sec x + tan x

are equivalent expressions.

2007-01-28 02:33:57 · 2 answers · asked by chris 2 in Mathematics