Science & Mathematics - 4 September 2007

okay so i have to have a topic by tomorrow.
i've been researching for a topic with dry ice.
can someone give me an advanced topic that has to do with dry ice.

whoever gives me a purpose with the topic gets 10 points.
thanks SO much!

oh & also:
Projects involving experimental work with vertebrate animals, humans,
recombinant DNA, body tissue, pathogenic organisms or controlled substances
are NOT Permitted.

^^taken exacly from the science fair rule book thng.

2007-09-04 17:20:53 · 5 answers · asked by Victoria 4 in Chemistry

2007-09-04 17:20:34 · 2 answers · asked by Anonymous in Biology

does anyone know the easiest way to learn how to use a TI-84 graphing cal.?? recomendations book..internet etc.

2007-09-04 17:19:04 · 2 answers · asked by Elizabeth B 1 in Mathematics

Hi, I've been having troubles with problems like these. I understand the concepts but can't get the problem right. Please explain and write problem. Please and early thank yous:

3a(a(squared)-2a+1)

The a squared is an a with the little 2 exponent over it

Ty again

2007-09-04 17:16:59 · 5 answers · asked by nobody 3 in Mathematics

When a 100-N bag of nails hangs motionless from a single vertical strand of rope, how many newtons of tension are exerted in the strand?

How about if the bag is supported by four vertical strands?

2007-09-04 17:16:46 · 2 answers · asked by Anonymous in Physics

2007-09-04 17:15:31 · 3 answers · asked by tempname73904 2 in Biology

Petrolyn oil is a combination of natural oil and synthetic oil--4 parts natural oil for every 7 parts of synthetic oil. How many liters of synthetic oil are contained in 627 liters of Petrolyn oil?

2007-09-04 17:15:17 · 2 answers · asked by baby166_99 2 in Mathematics

2007-09-04 17:15:13 · 4 answers · asked by Naseer A 1 in Biology

What does a homeostatic imbalance have to do with a person being in a coma? And what roles do the negative and positive feedback systems have on a person in a coma?

2007-09-04 17:13:47 · 1 answers · asked by gcer445 1 in Medicine

2007-09-04 17:13:41 · 2 answers · asked by Anonymous in Physics

(only one allele is present rather than two). If there is only one allele, do you have to know whether it is a dominant or recessive allele in order to know whether it will be expressed? Discuss.

2007-09-04 17:05:16 · 3 answers · asked by Naseer A 1 in Biology

When he was using the radioactive release through the gold foil, are the particles that make up the radioactive protons or neutrons? Explain why.

2007-09-04 17:05:08 · 2 answers · asked by Anonymous in Other - Science

Problem: x=[(√y)(y-3)]/3

I am finding the definite integral from 1 to 4.

I believe I need to integrate with respect to y using the equation:

s=∫√{1+[g'(y)]²}

I started by taking the derivative of the original equation x=[(√y)(y-3)]/3 to find g'(y).

I came up with [(√y)/3] + [(y-3)/(2√y)]

Then I squared that quantity to equal...

[(√y)/3] + [(y-3)/3]+[(y-3)(y-3)]/4y

and after much algebra to simplify and combine...

[25y² - 60y + 81]/36y

I am stuck here, and am not even sure if my algebra is correct... any help please?

Please show all steps... Thanks in advance.

2007-09-04 17:01:19 · 4 answers · asked by Peter M 2 in Mathematics

There is a sales tax of $5 on an item that costs $52 before tax. At the same tax rate, what is the sales tax on an item costing $130 before tax?

2007-09-04 17:00:28 · 13 answers · asked by baby166_99 2 in Mathematics

The star grouping Leo (the lion) extends for about 30° along and close to the celestial equator. At low to mid-latitudes, roughly how long does it take Leo to rise above the horizon?

2007-09-04 16:59:27 · 3 answers · asked by ChEMIsTrY ChICkiE 1 in Astronomy & Space

i dont know how to find the nucleotide number of a double stranded DNA polynucleotide that contains 80 thymidylic acid and 110 deoxyguanylic acid residues. please help, thanks.

2007-09-04 16:58:49 · 1 answers · asked by bkowner2003 2 in Biology

that the hole in the ozone layer is due, in part to cow and termite farts? I swear, I read that somewhere. Something to do with methane.

2007-09-04 16:56:15 · 7 answers · asked by Anonymous in Earth Sciences & Geology

I am a newlywed, we married in April 07 and so far, things are going well but I keep feeling a fear of us breaking up soon. I need to know if hes going to be around for a long time; and also can you tell me anything about him that I should know.....please clear your minds and help me!!!

2007-09-04 16:53:19 · 9 answers · asked by Lovely 4 in Parapsychology

I am studying analytical techniques at the moment in senior chemistry and I am having trouble trying to understand emission spectroscopy. Information on chemical theory, its application and just a brief overview would really help. Please Help!

2007-09-04 16:49:40 · 1 answers · asked by H 2 in Chemistry

The largest stretch of tropical rainforests exists in ____________
A. the Amazon Basin
B. Indonesia
C. the Congo Basin
D. the Philippines
2.
The coniferous forests are characterised by the following features except one which is ________________.
A. the trees are evergreen
B. straight trunks and a cone-shaped outline
C. small needle-like leaves
D. the undergrowth is especially thick.
3.
Deciduous trees shed their leaves to reduce _________________.

A. the intake of sunlight
B. transpiration
C. damage
D. carbon dioxide
How do we measure rainfall?
A. Thermometer
B. Rain gauge
C. Rain meter
D. Annenometer

Where would you place a rain gauge in school in order to obtain accurate reading for rainfall?
A. In the basketball court
B. Along the corridor
C. On a roof top
D. In the school field

2007-09-04 16:49:13 · 1 answers · asked by Anonymous in Geography

I was reading the Rutherfield theory and I was kind of confused. Also, how come a negative particle can't merge with the nucleus? Does that mean protons can? (grade 10)

2007-09-04 16:47:54 · 6 answers · asked by Anonymous in Other - Science

It is inportant.

I know three oceans

pacific ocean
artic ocean
atlantic ocean

what am I missing?

2007-09-04 16:47:48 · 11 answers · asked by Paige 3 in Earth Sciences & Geology

abs= absolute value.

2007-09-04 16:41:18 · 3 answers · asked by north h 3 in Mathematics

2007-09-04 16:39:39 · 3 answers · asked by Anonymous in Earth Sciences & Geology

Show how to figure it out please?

2007-09-04 16:39:24 · 1 answers · asked by jumba 1 in Physics

problem:
An elevator started on the 9th floor,It went up 6 floors,then down 4 floors,down 7 ,and up 5 floors.On what floor did the elevator finally stop at? please explain how u got ur anser so i know how nx time.thnx in advance!!! luv ya'll!!

2007-09-04 16:38:38 · 4 answers · asked by i_lyk_math 1 in Mathematics

(x+1)^2(x-2) + (x+1)(x-2)^2 = 0

2007-09-04 16:38:37 · 2 answers · asked by GHAAD 4 in Mathematics

Two blocks, each of mass M, are connected by at extensionless string of length L. One block is placed on a smooth horizontal surface, and the other block hangs over the side, the string passing over a frictionelss (massless) pulley.

a. Find the Lagrangian

b. Determine y(t) (assume y(t=0)=0 and y'(t=0)=0)

2007-09-04 16:38:06 · 2 answers · asked by Stephanie 1 in Physics

given that h(x): x^2-4/x+2 @ x<-2
and : -4 @ x=-2
and : -2+x @ -2 Determine which of the following statements is true with regard to the continuity of h(x) at the point x = -2.
h(x) is continuous
h(x) has jump discontinuity
h(x) has a removable discontinuity
h(x) has infinite discontinuity
None of the above(this is what i believe the answer to be)

2007-09-04 16:35:01 · 2 answers · asked by enslaven 1 in Mathematics

2007-09-04 16:31:16 · 4 answers · asked by dayle l 1 in Earth Sciences & Geology