Science & Mathematics - 12 July 2007

2007-07-12 23:55:49 · 13 answers · asked by 24 years o natural Philosophier 2 in Zoology

integrate: (x^2 + 1) / (x^4 + 1) wrt dx.

hint: the integral can be also wirten as (1 + 1/x^2) / (x^2 + 1/x^2 + 2 - 2).......

2007-07-12 23:53:10 · 1 answers · asked by Secret L 1 in Mathematics

Remaining Trig Functions of Theta.

(1) sin(theta) = -(2/3), where pi < theta < (3pi/2).

(2) cos(theta) = 4/5, where 270 degrees < theta < 360 degrees.

2007-07-12 23:47:02 · 4 answers · asked by journey 1 in Mathematics

What do meters have to do with this problem???

2007-07-12 23:45:44 · 5 answers · asked by Anonymous in Chemistry

Let t = theta.

If cos(t) = 0.2, find the value of cos(t) + cos(t + 2pi) + cos(t + 4pi).

2007-07-12 23:33:37 · 5 answers · asked by journey 1 in Mathematics

2007-07-12 23:32:29 · 7 answers · asked by Anonymous in Physics

2007-07-12 23:25:41 · 7 answers · asked by john 4 in Other - Science

Find the exact value of each of the remaining trig functions of theta.

Let t = theta

(1) cos(t) = 3/5, where t lies in quadrant 4

(2) sec(t) = -2, where tan(t) > 0

2007-07-12 23:23:17 · 5 answers · asked by Sharkman 1 in Mathematics

2007-07-12 23:15:41 · 13 answers · asked by erwin d 1 in Astronomy & Space

Use the fact that the trig functions are periodic to find the exact value of each expression. Do NOT use a calculator.

(1) sin390 degrees

(2) csc(9pi/2)

2007-07-12 23:15:15 · 2 answers · asked by Sharkman 1 in Mathematics

OK, here's the question:
A line from vertex C of triangle ABC bisects the median from A, meeting AB at E. Prove that E divides AB in the ratio 1 : 2.

2007-07-12 22:56:10 · 4 answers · asked by Akilesh - Internet Undertaker 7 in Mathematics

2007-07-12 22:55:33 · 3 answers · asked by anmarie 1 in Engineering

relevance of gravity on an object to fall 300 meters

2007-07-12 22:48:09 · 2 answers · asked by james c 1 in Engineering

2007-07-12 22:47:42 · 5 answers · asked by ice 1 in Mathematics

is a "fight" between science and religion? there are some evidences that adam or eve existed?

2007-07-12 22:40:18 · 15 answers · asked by deysn_2007 1 in Earth Sciences & Geology

2007-07-12 22:39:11 · 5 answers · asked by Anonymous in Engineering

Hi.
I have the following log problems that I can´t solve. I have the answers but I don´t know how to go about getting it. Could someone please walk me through the solution step by step so I can learn how this is done?
1) 2 log base3 (x-1) + log base3 9 = 2 ; (2 times log base 3 (x-1) + log base 3 and then 9 = 2).
2) ln(x+7) - ln(x+2) = ln(x+1)
Thank you!

2007-07-12 22:38:04 · 4 answers · asked by F 6 in Mathematics

2007-07-12 22:17:07 · 6 answers · asked by smartbiz85 1 in Physics

a. -40.
b. 35.
c. 50.
d. 75.
e. 85.

2007-07-12 21:43:04 · 8 answers · asked by RocK Baby 4 in Mathematics

Does anyone know about the Space Odyssey (Pegasus) voyage to planets and is that true ?

2007-07-12 21:36:08 · 6 answers · asked by Anonymous in Astronomy & Space

A salt water tank has 100 KG of salt and 500L of water. The input of salt water going in is 10L/sec, with a concentration of 1K/L. The output is whatever concentration is in the tank at time T, at a rate of 10L/sec. Assume perfect mixing of salt in the tank. What expression in terms of T can represent the amount of salt F(T)? Will integration be required on any part of this?

2007-07-12 21:35:31 · 2 answers · asked by Tina N 1 in Mathematics

2007-07-12 21:27:52 · 10 answers · asked by Anonymous in Medicine

We can save electricity in storage batteries, we can save water in a tank, and we can also save the air in closed tank, is it possible to save the light as it is and use it when it is required.

2007-07-12 21:26:49 · 5 answers · asked by A.Ganapathy India 7 in Other - Science

2007-07-12 21:25:13 · 7 answers · asked by DARREN 1 in Geography

a. 1/6.
b. 2/8.
c. 2/3.
d.1/3.
e.3/6.

2007-07-12 21:17:00 · 11 answers · asked by RocK Baby 4 in Mathematics

2007-07-12 21:03:04 · 2 answers · asked by Fiona R 1 in Engineering

2007-07-12 20:48:46 · 8 answers · asked by fozia l 1 in Physics

2007-07-12 20:38:19 · 5 answers · asked by treatop 1 in Engineering

Hi... Im using a deodorant that has the following ingredients:

Material/Ingredients: Alcohol Denat, Water (Aqua), Fragrance (Parfum), PEG-40 Hydrogenate Castor Oil, Acrylates/Octylacrylamide Copolymer, Limonene, Linalool, Ethylhexyl Methoxycinnamate, Benzyl Salicylate, Hydroxyisohexyl 3-Cyclohexene Carboxaldehyde, Benzophenone-3, Butylphenyl Methylpropional Hydrolyzed Jojoba Esters, Dodium Carbonate, Alpha-Isomethyl Ionone, Coumarin, Citral, Hydroxycitronellal, Eugenol, Geraniol, BHT, D&C Red No.33 (CI 17200), FD&C Yellow No.5 (CI 19140), FD&C Blue No.1 (CI 42090), EXT.D&C Violet No.2 (CI 60730)

I was wondering if any are antiperspirants? If so I will stop using it as I've heard it's really bad for you to actually stop your body from sweating and that it may be a cause for cancer.

Thanks!

2007-07-12 20:35:03 · 1 answers · asked by Mr.Chipmonk 1 in Chemistry

Hi... Im using a deodorant that has the following ingredients:

Active Ingredients:SD Alcohol 39-C; Water; Fragrance; PEG-60 Hydrogenated Castor Oil; Allantoin; Benzophenone-9; Menthol; Ext. D&C Violet No. 2; FD&C Yellow No. 5; FD&C Blue No. 1; D&C Red No. 33.

I was wondering if any are antiperspirants? If so I will stop using it as I've heard it's really bad for you to actually stop your body from sweating and that it may be a cause for cancer.

I've been using antiperspirants for years but have recently stopped and will never use them again!

Thanks

2007-07-12 20:29:54 · 1 answers · asked by Mr.Chipmonk 1 in Chemistry