Science & Mathematics - 28 November 2007

2007-11-28 04:43:32 · 4 answers · asked by jackinsonthomas 1 in Astronomy & Space

refer to the triangle in the figure. find an expressioin that represents its perimeter. note: theres a pic of a triangle and it labels 3/4x, 1/x^2, and 5/x^2 on each side...not sure what to do...help!

2007-11-28 04:39:46 · 4 answers · asked by God Bless America!~ 4 in Mathematics

f(x)= 1/x around the x axis. Find the volume of Torricellis Trumpet when X [1,10].
I dont know where to begin for would prefer someone to help point me in the right direction?

Is it Pi (Integral from 1 to 10) 1/x? take the integral of 1/x (being (2/3) X) and substitue? = Pi [(2/3) X] (1 to 10)

2/3 pi - 20/3 pi = -6 pi? This is all guess work because i'm not too sure of myself with finding volume.

2007-11-28 04:37:53 · 3 answers · asked by Matthew S 1 in Mathematics

Calculate the electric power produced per square meter of windmill operating at 70 % of the theoretical maximum efficiency, with an electric generating efficiency of 90% when the wind velocity is 10 m/sec.

2007-11-28 04:36:45 · 1 answers · asked by Anonymous in Physics

Prophecy from Century II # 46
After great human suffering, a greater one approaches;
The greater motor renews the centuries.
Rain, blood, milk, famine, iron, and plague;
Fire seen in the heavens, with a long trail of sparks.

2007-11-28 04:36:28 · 6 answers · asked by penutbutter141516 1 in Earth Sciences & Geology

maths question

2007-11-28 04:36:13 · 13 answers · asked by Jenny 3 in Mathematics

subtract

1. 2/5w+10 - 3/2w-4




2. 3/x^2+4x+3 - 1/x^2-9

2007-11-28 04:35:26 · 3 answers · asked by God Bless America!~ 4 in Mathematics

If the wind blows for one year at a steady 10 m/sec, how much would be the energy we could get in this year per square meter of cross section through the use of a windmill? Express the answer in kWh. (use air density of 1kg/m3)

2007-11-28 04:34:33 · 1 answers · asked by Anonymous in Physics

All I know is sin(90) = 1, sin(0) = 0, sin(30) = 0.5, cos(0) = 1, cos(90) = 0.

Yes, I could use a calculator now, but I need to know how to figure it out without aid, else I'll be helpless on my exams.

If I'm given something like sin(60), sin(50), cos(30), or cos(45), how could I figure these out without a calculator?

2007-11-28 04:33:02 · 9 answers · asked by A 1 in Mathematics

2007-11-28 04:31:00 · 1 answers · asked by JC927 1 in Botany

2007-11-28 04:28:06 · 8 answers · asked by Luke 2 in Weather

1. Solve the triangle, B = 37 degrees 20 minutes, b = 4.08, a = 24.78

My answer is no solution.

2. Solve the triangle B = 20 degrees, C = 70 degrees, a = 1

My answer comes out to:

A = 90 degrees
b = .34
c = .93

Am I correct?

Thanks.

2007-11-28 04:26:51 · 1 answers · asked by labelapark 6 in Mathematics

Evaluate:
-infiniti
∫ x dx/(x^2+5)^2
0

2007-11-28 04:20:21 · 2 answers · asked by A4life2k4 1 in Mathematics

2007-11-28 04:20:01 · 7 answers · asked by Anonymous in Earth Sciences & Geology

LOOK AT THE PICTURE

One square is inside another square...the distance from the edge (diagonally) of the outer square to inner square is 2.
The lenght of the side of the outer square is 10...how much is the lenght of the inner square
see picture....
http://tinypic.com/view.php?pic=8ezrfgz&s=1

2007-11-28 04:10:57 · 6 answers · asked by kdat 1 in Mathematics

All most all the invitro expriments use the oxidized form of insulin. Sigma also have oxidized insulin A and B. Please explain what are they and their structure. Additional informations regarding this are welcome.

2007-11-28 04:09:38 · 1 answers · asked by veeran 2 in Biology

2007-11-28 04:08:02 · 2 answers · asked by JC927 1 in Biology

I've noticed that when you are lucky enough to catch a moth or butterfly, they usually leave a very fine powder on your hands. What is this strange dust?

2007-11-28 04:07:01 · 3 answers · asked by lawless_chaos 1 in Zoology

so far all i have is f(1/4)= log2^1/4

2007-11-28 04:05:12 · 4 answers · asked by ALF 2 in Mathematics

1) The length of a rectangular playing field is 5ft less than twice it's width.If hte perimeter of the playing field is 230 ft,find the length and width of the field .
2) A byciclist rode into the country for 5h. In returning her speed was 5mi/h faster and the trip took 4h.tWhat was her speed each way?

2007-11-28 04:04:24 · 4 answers · asked by Anonymous in Mathematics

Is there any Riemann integrable bounded function on a closed and bounded interval [a,b] which has primitive function and it does not satisfy the Second fundamental theorem of calculus?

2007-11-28 04:04:23 · 1 answers · asked by Soheil 1 in Mathematics

2007-11-28 04:03:35 · 17 answers · asked by vy b 1 in Astronomy & Space

Have you ever had inspiration for some book or invention, and didn't act upon it. Later you find out that someone wrote the book you wanted to or made the invention that you had sketched out on a napkin? There have been many lawsuits involving people who showed their ideas to famous people and get plagurized.

Mind reading is one thing, but there could be that one percent of the population that is tuned into grabbing all of the best ideas right out of the ether - coincidence or not?

Is the act of thought really a private issue?

2007-11-28 04:03:31 · 10 answers · asked by bronxgraffitiart 3 in Paranormal Phenomena

2007-11-28 04:03:02 · 2 answers · asked by remarcus m 1 in Astronomy & Space

I know it's electrical, that it is created when clouds collide etc, but what (in scientific terms) is it? How does is occur?
All answers appreciated! :)

2007-11-28 04:02:26 · 11 answers · asked by Ethereal 4 in Weather

lol, I can only think of doing it the really long way...

2007-11-28 04:01:04 · 8 answers · asked by Anonymous in Mathematics

2007-11-28 04:00:32 · 15 answers · asked by mohan k.s. . 1 in Earth Sciences & Geology

I'm really bad with algebra and I only need the basic level for my degree but I can't place into the class I need. Is there a way that I can cheat on the placement test?

2007-11-28 03:59:47 · 8 answers · asked by Anonymous in Mathematics

2007-11-28 03:49:46 · 4 answers · asked by Day-Z 1 in Astronomy & Space

I got a 78% in the class. The project is worth 60% of the class. The passing grade is 60%.

Me and my class, is doing a project instead of a final exam.
The class is called Office Procedures.

2007-11-28 03:49:30 · 5 answers · asked by Misty 2 in Mathematics