Science & Mathematics - 9 September 2007

Question: Show that "f" is continuous on (-oo, oo)

f(x) = { sinx if x < pi/4 , cosx if x > or = pi/4 }

I'm really stuck. I don't know how I should work this problem.

Any help is appreciated. Thanks.

2007-09-09 15:15:46 · 6 answers · asked by shih rips 6 in Mathematics

1. Describe bichromatic analysis including the principle, arrangment of components and advantages. Extrapolate the principle to multiple-wavelength spectrophotometry. Then list examples of comon interferences that can be corrected using bichromatic analysis.

2. The difference between single beam and double beam spectrophotometry?

thanks everyone...=)

2007-09-09 15:13:16 · 1 answers · asked by Anonymous in Chemistry

If the age comes from looking back at the Cosmos... then what about looking forward? Is that counted as well? What about the elapsed time?

2007-09-09 15:12:59 · 16 answers · asked by smarta$$ 1 in Astronomy & Space

A wire is stretched from the ground to the top of an antenna tower. The wire is 20 ft. long. The height of the tower is 4 ft. greater than the distance d from the tower's base to the bottom of the wire. Find the distance d and the height of the tower.

2007-09-09 15:11:52 · 6 answers · asked by Brandon 1 in Mathematics

Hello, all:

I live in central Canada, and we have a HUGE spider that's spun a web just outside our living room window (third floor). Here are a couple of pictures of her (I'm assuming it's female because of its largeness):

http://img.photobucket.com/albums/v189/crowdog66/album2/ourspider2.jpg

http://img.photobucket.com/albums/v189/crowdog66/album2/ourspider.jpg

Her body, not including the legs, is about an inch long.

Any help that anyone can give in identifying her species would be appreciated.

2007-09-09 15:11:23 · 6 answers · asked by prairiecrow 7 in Zoology

2007-09-09 15:09:45 · 4 answers · asked by shooting doctor 4 in Zoology

2007-09-09 15:09:17 · 2 answers · asked by john 1 in Astronomy & Space

The question may sound silly ,but..everyone is always saying Space is not Tangible,.or has no mass,.but how can something with no mass,.be effected by Gravity/./?

2007-09-09 15:07:21 · 9 answers · asked by Joseph 2 in Astronomy & Space

a) A standard sheet of paper measures 8 1/2 by 10 inches.
The area of one such sheet of paper is 0.0549m^2

A second sheet of paper is three-quarters as long and three-quarters as wide as the one described in part (a). By what factor is its area less than the area found in part(a)?


I understand that all you have to do is (.75)(.75) to get the percentage but by what FACTOR would this be off by?

Thanks so much for your help! God Bless!! :)

2007-09-09 15:07:13 · 2 answers · asked by PaNaSoNiCeDgE 1 in Mathematics

2007-09-09 15:06:21 · 7 answers · asked by jman146 2 in Mathematics

i have to do assigment title "polymer in our life".but i don't know what is the best for me.Who have the ideas please help me...

2007-09-09 15:05:58 · 3 answers · asked by nurul 1 in Chemistry

Can someone show me how to do this.
Factor by grouping
x^5+4x^3-2x^2-8
thanks so much

2007-09-09 15:05:13 · 2 answers · asked by dtrain2419 1 in Mathematics

Is this just a rumour or is there any truth to this?

2007-09-09 15:05:06 · 7 answers · asked by Anonymous in Astronomy & Space

help me plzz

2007-09-09 14:59:13 · 3 answers · asked by its a secret 2 in Physics

A friend told me that he saw a Discovery Channel program which gave the information that Chinese people physically cannot develop large muscles. I don't know the science behind it but maybe it would explain why many Chinese people are small (in muscle mass) compared to other races. I was just wondering if this is complete nonsense or if there is any truth behind it.

2007-09-09 14:56:06 · 5 answers · asked by d 2 in Biology

2007-09-09 14:55:54 · 5 answers · asked by Kurt v 1 in Mathematics

What is the formula to find the 21st term?

0, 1/6, 1/3, 1/2, .... Find the 21st term.

2007-09-09 14:51:42 · 4 answers · asked by Anonymous in Mathematics

Humanity might try and take the earth with them when they destroy themselves.

2007-09-09 14:50:33 · 8 answers · asked by Anonymous in Astronomy & Space

specifically, what it has to do with my sisters keeper

2007-09-09 14:49:57 · 8 answers · asked by zozo 1 in Biology

2007-09-09 14:47:46 · 9 answers · asked by Anonymous in Astronomy & Space

2007-09-09 14:46:10 · 2 answers · asked by Anonymous in Weather

Find the equation of the tangent line to the graph at t = pi/2

y=_____x + _______

Please explain b/c i thought the derivative would be
cos(12*pi/2) * 12 + 5 - sin(pi/2) = 16 but the 16 isnt the answer!

2007-09-09 14:41:07 · 5 answers · asked by zahras01 1 in Mathematics

I would prefer if you could exclude weekends

2007-09-09 14:39:18 · 3 answers · asked by Sam 2 in Mathematics

Can you please explain
i thought it was 4*cos(4x) or 4*-cos(4x)

2007-09-09 14:38:02 · 5 answers · asked by zahras01 1 in Mathematics

f(x)= 100/1+2^-x


find the inverse

2007-09-09 14:37:42 · 3 answers · asked by Katie 4 in Mathematics

a. Matter is cycled through ecosystems; energy is not.
b. Energy is cycled through ecosystems; matter is not.
c. Energy can be converted into matter; matter cannot be converted into energy.
d. Matter can be converted into energy; energy cannot be converted into matter.
e. Matter is used in ecosystems, energy is not

Thanks!!!

2007-09-09 14:35:34 · 5 answers · asked by . 6 in Biology

What is its remainder if it is divided by (x-1)(x-2)?

2007-09-09 14:32:47 · 3 answers · asked by Ase 2 in Mathematics

Is better to wear black colth or white cloth on the hot day, why?

Which type of cloth is best to waer on cold, sunny winterday to warm quickly?

2007-09-09 14:30:36 · 4 answers · asked by Anonymous in Earth Sciences & Geology

- 0.4x < -28

Solve as inequality

2007-09-09 14:30:27 · 5 answers · asked by Anonymous in Mathematics

this statement below is correct as written. re write it, inserting parentheses so that the resulting statement is correct.

12 - 8 * 1 + 7= 32

2007-09-09 14:28:47 · 5 answers · asked by Anonymous in Mathematics