Science & Mathematics - 24 September 2007

2007-09-24 18:57:18 · 4 answers · asked by shotwho24 3 in Botany

wel..again i face anther project for math..
which is calculus...any application in this topic..
i knw u guys will suggest to find volume and area using anti derivative..but i dont want it..others application??but i dun have idea..someone help to figure out what project should i do..and hope it is with the answers because easy for me to refer back....thanx

2007-09-24 18:48:58 · 4 answers · asked by Anonymous in Mathematics

120 torr and 210mm HG

a. 2275 torr
b. 972 torr
c. 0.411atm
d. 331 torr

2007-09-24 18:48:24 · 1 answers · asked by Anonymous in Chemistry

2007-09-24 18:47:15 · 3 answers · asked by horse 2 in Mathematics

if you had used a crude balance that allowed only one signnificant figure, how would this have affected your results for a) area, b) volume,c) thickness

2007-09-24 18:44:32 · 1 answers · asked by Anonymous in Chemistry

f(x)={ 2x+9 for x<(or equal to)3
-4x+c for x>3

2007-09-24 18:42:31 · 2 answers · asked by lexi p 1 in Mathematics

http://i20.tinypic.com/juvdsg.jpg

http://i20.tinypic.com/15ouxyc

http://i22.tinypic.com/mjwg49.jpg

can you help me complete the black ones, and check the ones that are already filled in? thank you!

2007-09-24 18:37:28 · 1 answers · asked by Anonymous in Mathematics

Does anyone know how to calculate normality of the following aqeous solutions?
.25 M Na C2H3O2 (sodium acetate)

.50 M K2SO4 (potassium sulfate)

5.0% (w/v) CaCl2 (calcium chloride)

please help??? i need this one ! please

2007-09-24 18:34:06 · 3 answers · asked by SJ 1 in Chemistry

The average density of the universe as a whole is estimated to be about 1.5*10^-29 g/cm^3. If we assume that the entire mass is only hydrogen atoms, what is the average volume of space, in liters that contains one H atom?

2007-09-24 18:24:35 · 2 answers · asked by Anonymous in Chemistry

White phosphorus, P4, is prepared by fusing calcium phosphate, Ca3(PO4)2, with carbon, C, and sand, SiO2, in an electric furnace.


2Ca3(PO4)2(s) + 6SiO2(s) + 10C(s) ==> P4(g) + 6CaSiO3(l) + 10CO(g)


How many grams of calcium phosphate are required to give 36.5 g of phosphorus?

2007-09-24 18:24:03 · 2 answers · asked by Joe C. 1 in Chemistry

2007-09-24 18:19:14 · 4 answers · asked by DFreakingC 1 in Astronomy & Space

The operations manager at a light bulb factory wants to determine whether there is a difference in the average life expectancy of bulbs manufactured on two different types of machines. The process standard deviation of Machine I is 110 hours and of Machine II is 125 hours. A random sample of 25 lights bulbs obtained from Machine I indicates a sample mean of 375 hours &a similar sample of 25 from Machine II indicates a sample mean of 362 hours. Using the 0.05 level of significance, which of the following statements offers the most accurate and appropriate measure that there is not enough evidence to conclude that there is a difference in the average life of bulbs produced by the two types of machines?
A. Z = 0.3904 and is between the critical bounds of plus or minus 1.96
B. t = 0.0117 and is between the critical bounds of plus or minus 2.01
C. t = 1.3829 and is between the critical bounds of plus or minus 2.01
D. Z = 0.424 and is between the critical bounds of plus or minus 1.96

2007-09-24 18:16:02 · 1 answers · asked by jane 1 in Mathematics

I heard that fluoride is really bad, especially for children. The reason for fluoride is to make stronger teeth. And that the dental professionals don't have a say against it.

What do you think? Also, if fluoride is needed to maintain strong teeth then what is there that's causing weak teeth? I grew up in a country where we drank water from streams and rivers and my teeth are strong. There are some in-perfections because brushing was near none.

2007-09-24 18:15:06 · 5 answers · asked by amalone 5 in Other - Science

3y-7y=28

2007-09-24 18:13:25 · 7 answers · asked by Mariana O Moustro 1 in Mathematics

use a power series to find a power series representation of the given function. then determine the radius of convergence of the resulting series.

f(x)= x / (9-x^2)

PLEASE HELP!

2007-09-24 18:08:44 · 3 answers · asked by chris s 1 in Mathematics

A pile starts with n sticks, with n>=2. The pile is split into two piles, and the product of the sizes of the piles is calculated. One of these new piles is then split into two piles, with the product of the sizes of these two new piles calculated and added to (the sum of) the previous product(s). This process continues until we have n piles with 1 stick in each.
For example, starting with 5 sticks, we could split 2, 3 (giving 6), then 2, 2, 1 (giving 6 + 2), then 1, 1, 2, 1 (giving 6 + 2 + 1), then 1, 1, 1, 1, 1 (giving 6 + 2 + 1 + 1 = 10).
Prove using strong induction that, no matter how the pile is split, the total at the end is always 1/2(n^2 -n).

Help?

2007-09-24 18:03:37 · 2 answers · asked by Anonymous in Mathematics

express the answer in terms of intervals if possible. may need inf and cup symbols.

2007-09-24 18:03:19 · 2 answers · asked by icygurl555 1 in Mathematics

hey guys...
it's me again....

we have a engineering statics problem....particularly a wrench problem....

what would i do if the given data has the Force F having x, y and z components and the Moment M having x, y and z components?

please help me with my problem....

for sure, you are of BIG help to my problem...

have a nice day to everyone!!!!

jason!!!!

2007-09-24 17:59:32 · 1 answers · asked by nosaj_amazin 1 in Engineering

Given the following set of data, find the value that corresponds to the 75th percentile.

10, 44, 15, 23, 14, 18, 72, 56

2007-09-24 17:57:29 · 2 answers · asked by Splendidy 1 in Mathematics

Also if you know Neutrons and protons too

2007-09-24 17:54:58 · 8 answers · asked by Anonymous in Physics

2007-09-24 17:53:51 · 2 answers · asked by Anonymous in Physics

2007-09-24 17:51:42 · 10 answers · asked by Paul M 1 in Weather

I just watched SPACE COWBOYS with its ending where Tommy Lee Jones decided to stay at the moon. So my question is can He live longer without food on the moon?

2007-09-24 17:46:49 · 8 answers · asked by Anonymous in Astronomy & Space

Ok I've got less than 1 hour to answer this question, I've got 6.42x10^-3 mol of Cu^+2, it takes 1.61 mL of 16.0 M HNO3 to completely dissolve this.

If I add 5 mL 16.0 M HNO3 to the already dissolved Cu in HNO3, how much 4.00 M NaOH will be required to neutralize the acid AND turn all the Cu+2 into Cu(OH)2???
Answers I know are incorrect:
2.32x10^-2 L
1.32x10^-2 L
2.96x10^-2 L

Help within the next hour would be SOOO amazing, I would be so grateful!

2007-09-24 17:43:14 · 1 answers · asked by Flubleah 1 in Chemistry

Consider that points P such that the distance from P to A(1,-2,1) is twice the distance from P to (3,-4,5). Show that the set of all such points is a sphere, and find its center and the radius

2007-09-24 17:41:14 · 2 answers · asked by Anonymous in Mathematics

2007-09-24 17:37:39 · 14 answers · asked by stonehouse421 2 in Astronomy & Space

Suppose that f'(x) = -g(x) and g'(x) = f(x) for all real x
a. Prove that f^2(x) + g^2(x) = C for some constant C.
b. Suppose that f(0) = 0 and g(0) = 1. What is C?

2007-09-24 17:32:27 · 1 answers · asked by Anonymous in Physics

(3ab 2) 3
( 3ab squared) to the power of three.
How do you simplify this equation?
i got 3ab (6) but the answer is 27a (2) b (2)

How do you get this?

2007-09-24 17:30:23 · 1 answers · asked by poojaa :) 4 in Mathematics

2007-09-24 17:24:30 · 1 answers · asked by edward j 1 in Engineering

I'm not a scientist but I'm just curious.

Since nothing is really certain in science, a lab test that proofed to be beneficial can only be made truth if time and time again it keeps turning out the same result. These tests has to be repeated as we progress in our scientific knowledge. Any scientific claim that refuses to be retested cannot be trusted.

Is this the way science should be? If so and if something is found to breach this method, what does it do to science. If the science community allows such practices to continue, what is there to hope for? This seems to be a problem in the scientific industries because of profit over science.

What are your thoughts?

2007-09-24 17:23:50 · 4 answers · asked by amalone 5 in Other - Science