Science & Mathematics - 15 December 2007

i watched a documentary, some people were claiming that this was true

2007-12-15 09:22:23 · 12 answers · asked by Gabriel Z 1 in Astronomy & Space

the mean of 5 numbers is 27. four of the numbers are24, 33, 27, and 31.What is the fifth number?

2007-12-15 09:19:03 · 7 answers · asked by Anonymous in Mathematics

If the Taylor Series expansion for f(x) = ln(1+x/1-x) is:

2x + 2/3x^3 + 2/5 x^5 + 2/7 x^7...

how do I find f'''''(0)? (fifth derivative)

2007-12-15 09:14:20 · 5 answers · asked by Anonymous in Mathematics

http://img526.imageshack.us/my.php?image=img0538um7.jpg

thanks for any help.

2007-12-15 09:13:57 · 4 answers · asked by Anonymous in Botany

2007-12-15 09:11:22 · 8 answers · asked by nad 1 in Medicine

2007-12-15 09:10:37 · 4 answers · asked by Anonymous in Mathematics

2007-12-15 09:09:47 · 4 answers · asked by golfpro123 1 in Chemistry

2007-12-15 09:09:10 · 4 answers · asked by andrej.radevski 1 in Astronomy & Space

2007-12-15 09:08:58 · 3 answers · asked by Anonymous in Biology

in this problem t= theta

consider the planar curve given by
x(t)= t ln t , y(t)=sin t 0< t< +infinity

a)calculate x', x'', y', y''

b)find the values 0< t< +infinity where the tangent is horizontal or vertical

c)write down (without calculating) a formula that describes the length of the segment of the curve corresponding to 1< t< +infiniti

2007-12-15 09:08:06 · 1 answers · asked by Anonymous in Mathematics

What is the exact value of sin(arccos 3/5) and why?

2007-12-15 09:06:14 · 6 answers · asked by Ash 2 in Mathematics

2007-12-15 09:04:47 · 5 answers · asked by nana ♥ 2 in Biology

2007-12-15 08:59:26 · 1 answers · asked by lol 1 in Chemistry

Hi, I'm 12(7th grade), and I need help(or perhaps to answer to) with the following problem:
"Start with the number 1-double it, you get 2-double it, you get 4-double it, you get 8. Starting with the number 1, how many times will you have to double, so that the doubled number is over ten million?"
I'd really appreciate thorough answers and don't answer with useless things like "do it yourself", because I have tried that, and asked my parents. Thanks!

2007-12-15 08:59:26 · 7 answers · asked by Anonymous in Mathematics

Sea water contains roughly 28.0g of NaCl per liter.What is the molarity of sodium chloride in Sea water?

2007-12-15 08:59:17 · 4 answers · asked by Aaron C 3 in Chemistry

obesity and smoking are important risk factors for many age-related diseases. both are states of hightened oxidative stress, which increases the rate of telomere erosion per replication, and inflammation, which enhances white blood cell turnover.

what does this mean? I really dont get it!

2007-12-15 08:52:42 · 3 answers · asked by khadijazafar1 1 in Biology

what's the controlled, dependent, and independent variables of the experiment of onion cells under a microscope? please help! please please please help thank you!

2007-12-15 08:52:36 · 4 answers · asked by Anonymous in Biology

The equation is

d2y/dx2 + dy/dx + y = f(x);
y(1) = 3 ; y (3) = 5;
f(x) = 4x^2e^(2x)

Which methods can i use to solve it except
of finding y = x^r e^(2x)(Ax^2+Bx+C)?

2007-12-15 08:52:02 · 1 answers · asked by Specter 1 in Mathematics

1. Find the length of the given graph over the indicated interval. r= 5 ( 1 + cos (delta)). Interval: 0< delta < 2 pie.

2. Convert the given rectangular equation to polar form:
4 ((x)^2) - 5 ((y)^2) - 36 y - 36 = 0.

3. lim (-x ln x)=?
*note as limit approaches 0 from the positive side.

4. the area bounded by r^2 =sin (delta).

5. The area bounded by the small loop of r = 2-4sin(delta) .

6. the integral arctan (2x) dx, between the interval (0, 1/2).

7. if f(x) = 2 ^(sin(^(2)) (x)), then f' (pie/4) equals ?

2007-12-15 08:50:47 · 1 answers · asked by icemoon 2 in Mathematics

Which of the following comparisons between prokaryotic and eukaryotic cells is incorrect?

a. The lack of organelle in prokaryotes means that they are structurally less complex than eukaryotes.
b. The lack of internal membranes means that prokaryotes cannot compartmentalize function to the same extent as eukaryotes.
c. All membrane function in prokaryotes is accomplished in the plama membrane, while in eukaryotes, these functions are more distribted among the organelles.
d. The specialization of function in organelles suggests that eukaryotes will contain a wider variety of phospholipids than prokaryotes
e. The lack of organelles in prokaryotes means that the basic cellular functions are different in prokaryotes than in eukaryotes.

2007-12-15 08:50:41 · 4 answers · asked by Anonymous in Biology

i have 86 chemistry problems to solve out of those 86 problems I don't understand 6 if you could please help me...I appreciate thanks
1).How much heat must be removed to condense 15.75g H2O(g) at 100 degree C to produce 15.75g h2o(l) also at 100 degree C? Give answer in cal units.
2).A sample of N2 gas at STP occupies a volume of 1250mL. If the temperature and pressure of the gas is raised to 28degree C and 1.35atm respectively, what volume in liters will the gas occupy? Assume that the number of moles of gas is constant.
3)A 2.50L sample of nitrogen gas is at standard pressure and 21 degree celcius. What celcius temperature is required to increase the pressure to 115kPa and reduce the volume to 2.35L? Assume that the amount of gas is constant.
4)Calculate [H+] of a solution of HCl in water havong a pH=3.8. of the solution.
5)If 4.8375kJ of heat is required to warm a solid gold bar from 21degree C to 36 degree C, what is the mass of the bar in grams?

2007-12-15 08:49:09 · 3 answers · asked by Anonymous in Chemistry

the concentration of 15 mL of acetic acid diluted to 250 mL of water is 1.048 M.
what volume of 0.0867 M of NaOH is required to reach the equivalence point?

2007-12-15 08:47:07 · 3 answers · asked by mightyfiiiine 1 in Chemistry

2007-12-15 08:46:31 · 5 answers · asked by nana ♥ 2 in Biology

Your school club has sold 500 tickets to a chili supper. You have a chili recipe that serves 10. The recipe calls for 2tsps of chili powder. How much do you need for 550 servings?

2007-12-15 08:44:04 · 3 answers · asked by Alybaba 2 in Chemistry

in a lab we had to do we had to explore the effect of a buffer.
we had a test tube of milk and a test tube of water.
we then added a drop of vinegar to each.. one frop at a time.. to see if the pH would change

we found out that the pH of water changed first... but i dont know why it did or what it had to do with the buffer.

2007-12-15 08:43:33 · 3 answers · asked by Anonymous in Biology

29.1 degrees above the horizontal. The block is displaced 96.5m, and the coefficient of kinetic friction is 0.169. The acceleration of gravity is 9.8m/s^2. Work= 13406.7241J.
Find the magnitude of the work done by the force of friction. Answer is Joules.

2007-12-15 08:39:59 · 1 answers · asked by Anonymous in Physics

Ye, whats the struture of ribosomes, in simple words...

2007-12-15 08:33:59 · 3 answers · asked by ? 3 in Biology

what is the dependent variable for the experiment of onion bulb cells under microscope? please help! please please help thank you

2007-12-15 08:32:11 · 1 answers · asked by Anonymous in Biology

2007-12-15 08:31:13 · 4 answers · asked by Beekeeper 2 in Earth Sciences & Geology

Is the following trinomial a perfect square?

x^2+8x-16 ??

x^2-8x+16
(x-4)(x-4)

So, since x=-4 that makes a perfect square right??

2007-12-15 08:31:09 · 7 answers · asked by cuvelx 3 in Mathematics