Science & Mathematics - 23 October 2007

2007-10-23 12:12:31 · 1 answers · asked by bob m 1 in Engineering

Assume X is normally distributed with a mean of 10 and a standard deviation of 2. determine the value for x that solve each of the following:
a) P(X>x)=0.5
b) P(X>x)=0.95
c) P(x d) P(-x E) P(-x
Thanks!

2007-10-23 12:10:59 · 1 answers · asked by Jack 1 in Mathematics

why is it that fusion happens all the time on the sun but is very difficult and requires a huge amount of energy on the earth.

2007-10-23 12:06:00 · 6 answers · asked by Anonymous in Physics

Can the following conditional statements be arranged in logical order? If so, what theorem do they prove?
If I can't understand a problem, I get confused while studying it.
If a problem doesn't follow a pattern, then I can't understand it.
If I don't get confused while studying a problem, I can understand it.
If I get confused while studying a problem, then it is getting me trouble.
If a problem is giving me trouble, then it is too hard.

2007-10-23 12:05:39 · 3 answers · asked by Kana Y 1 in Mathematics

I got a different answer than someone in my class, a second opinion would be nice. Thanks!

2007-10-23 12:04:39 · 2 answers · asked by Anonymous in Mathematics

A frictionless pulley (a solid cylinder) of unknown mass M and radius r = 0.41 m is used to draw water from a well. A bucket of mass m = 1.42 kg is attached to a cord wrapped around the cylinder. A bucket starts from rest at the top of the well and falls for t = 2.82 s before hitting the water h = 7.85 m below. Neglect the mass of the cord.
a) What is the linear acceleration a of the falling bucket?
b) What is the angular acceleration,a, of the rotating pulley?
c) What is the tension T force for the cord?
d) What is the value of the torque,T, that is applied to the pulley by the bucket hanging on the card?
e) Using the value of the torque and the angular acceleration, find the moment of inertia I of the rotating pulley
f) Using the moment of inertia, calculate the mass of the pulley, M
g) What is the linear velocity, v, of the falling bucket just before it hits the water?
h) What is the angular velocity, w, of the rotating pulley just before the falling bucket hits the water?

2007-10-23 12:01:34 · 1 answers · asked by Anonymous in Physics

okay, it gives you f(x)= xe^(2x) and tells you to find all of the critical points

I set the derivative equal to 0, so I have x(2e^2x)+e^(2x)=0, but I am having trouble solving...help please

2007-10-23 11:59:54 · 1 answers · asked by Mr. Vill 1 in Mathematics

Can someone plz help me with these 3 problems.... I really appreciate it thanx....

1) 77x/3 divided by 2/15

2) 1/6x divided by 5/x^2

3) 30x/83 times 47/15

thanx...im kinda stuck on these 3

2007-10-23 11:59:48 · 1 answers · asked by Anonymous in Mathematics

well i need lots of help with these ?s cuz i need to study from em for test and i cant find answers :( pls help me if you can atleast some. pls explain in simple language so its easier for me to understand.



---if you think its wrong helping and dont want to, pls just dont answer. i really dont get these thats why i need help, its not ''cheating.''

1) how does environment of formation vary; grain size and texture in Igneous Rocks?

2) Which foliated Metamorphic rocks display:
a) banding? _________, ______, _______,
b) mineral alignment? _____________
c) foliation? (thin flattened layers) ____, _____, ____, ____.

3) fill in the blanks:
a) SHALE becomes ________
b) ___________ minerals becomes SCHIST
c) Segregated color bands occur in _________
d) __________ becomes QUARTZITE.
e) Limestone becomes _________
f) _________ forms by various rocks that change by hear from nearby lava or magma.
thanks!

2007-10-23 11:56:57 · 1 answers · asked by curtismayfield? 2 in Earth Sciences & Geology

Inhibitors are common in biological systems.

2007-10-23 11:56:50 · 1 answers · asked by Cholito 1 in Biology

which of these hydrates ( CuSO4, CdCl2, CaCl2) will have a vapor pressure of water:

A) Greater than the partial vapor pressure of water in the atmosphere at room temperature? Explain.

B) Less than the partial vapor pressure of water in the atmosphere at room temperature? Explain.

2007-10-23 11:56:28 · 1 answers · asked by NEEDs MATH HELP!! 1 in Chemistry

i need help in finding the complement and supplement of angles measured in degrees and radians.
example: 35.5 degrees
example: 5[pi] / 6

2007-10-23 11:56:02 · 3 answers · asked by molly m 1 in Mathematics

Do plants grow better in regular sunlight, no light at all or florecent light?

2007-10-23 11:54:18 · 3 answers · asked by Mckenna M 1 in Botany

2007-10-23 11:51:24 · 3 answers · asked by Anonymous in Geography

which of these hydrates ( CuSO4, CdCl2, CaCl2) will have a vapor pressure of water:

A) Greater than the partial vapor pressure of water in the atmosphere at room temperature? Explain.

B) Less than the partial vapor pressure of water in the atmosphere at room temperature? Explain.

2007-10-23 11:49:15 · 1 answers · asked by NEEDs MATH HELP!! 1 in Chemistry

Hello all again, well i am having a problem with motion. Here is the problem. You want to know how high a bridge is, so you go out to the middle of the bridge with a stone and a stopwatch. You drop the STONE over the side. It hits the water 4.6 seconds later. How high is the bridge?

OK well at first i was just thinking of multiplying 9.8m/s(2) and 4.6(s) but i don't really think that is right and this is where i am kind of stuck now. Can anyone help?

2007-10-23 11:48:46 · 2 answers · asked by Anonymous in Engineering

2007-10-23 11:47:14 · 3 answers · asked by Anonymous in Chemistry

Please it is a project!

2007-10-23 11:44:11 · 3 answers · asked by Valerie5_0 2 in Geography

17. A piece of pipe is 30 and 3/4 inches long. If five pieces, each 4 and 1/3 inches long, are cut from the pipe, how
many inches of pipe remain?
A. 9 and 1/12 inches C. 26 and 5/12 inches
B. 9 and 3/4 inches D. 30 and 3/4 inches



18. Find the difference between the product of 26.22 and 3.09 and the sum of 3.507, 2.08, 11.5, and
16.712.

A. 4.489 C. 47.2208
B. 6.511 D. 58.3108

2007-10-23 11:43:10 · 4 answers · asked by jair a 2 in Mathematics

2007-10-23 11:41:01 · 3 answers · asked by Kristen V 3 in Botany

2007-10-23 11:36:39 · 7 answers · asked by Lee J 1 in Geography

2007-10-23 11:34:23 · 3 answers · asked by jaelen d 1 in Geography

how do i go about figuring out if this is irreducible or not??? someone plz help!

2007-10-23 11:34:09 · 1 answers · asked by Anonymous in Mathematics

and what is the best object that is small and cheap and easy to find like in walmart?i know this is a lot to ask... but something that also equals 179 grams? its for a project...

2007-10-23 11:34:06 · 2 answers · asked by Yuki 2 in Mathematics

i need to know for my project which i need to finish quickly so i can print it out b4 9 so i can get it to school tomorrow

2007-10-23 11:33:21 · 6 answers · asked by ♥_Jessie_♥ 1 in Geography

2007-10-23 11:32:41 · 3 answers · asked by Mercury 2010 7 in Astronomy & Space

2007-10-23 11:32:11 · 5 answers · asked by tae tae 1 in Biology

They said evolution was proven wrong. That's not true right? Evolution is fact, isn't it?

2007-10-23 11:29:36 · 3 answers · asked by Anonymous in Biology

2007-10-23 11:29:26 · 1 answers · asked by Anonymous in Mathematics

Based on 300 generation at 20 years a generation, if only the last 3 generations are alive, that it takes 9 months to have a baby, and 54% of the population are female, how many children must each mother have to bring the population to present day figures of 6.6 billion?

Please show workings.

2007-10-23 11:27:21 · 8 answers · asked by Anonymous in Mathematics