Science & Mathematics - 30 July 2007

In determining the density of an unknown solid, it was immersed in water. If a portion of the sample sticks out of the water, how will this effect the calculation of the density?

2007-07-30 15:08:35 · 1 answers · asked by crown_hustle 1 in Chemistry

1. When Max recieved 10x tapes, he then had 5y + 1 times as many tapes as ge had orginally. In terms of x and y, how many tapes did Stanley have originally?
1. 10x(5y + 1) 2. 5y + 1 over 10x 3. 2x over y 4. 10 over 5y + 1 or 5. None of the above

I got 3 but I'm not sure if it's right.

2. If x>0 and y>0 and x^9=4 and x^7 = 9 over y^2, which of the following is an expression for the value of x in terms of y?

1. (4/5)y 2. (2/3)y 3. (3/2)y^2 4. 6y 5. 36y^2

This I had no idea how to do.

Thanks for any help. Please show steps if possible.

2007-07-30 15:05:47 · 1 answers · asked by Anonymous in Mathematics

the number of times a cricket chirps in one minute can indicate the surrounding temperature, using a special formula

2007-07-30 14:54:56 · 3 answers · asked by Anonymous in Other - Science

And I wanna know why people would even think that the Earth was created 6,000 years ago... bible huggers

2007-07-30 14:53:35 · 12 answers · asked by Anonymous in Earth Sciences & Geology

in terms of gens and chromosomes

2007-07-30 14:47:18 · 2 answers · asked by Dimitri VanHorn 1 in Biology

When there's a solar halo (a "glory" around the sun, or sunbow), I notice that the region between the ring and the sun looks darker than the rest of the sky. Even though it's closest to the sun!

When there's a double rainbow, I notice that the region between the two bows looks darker than the rest of the sky.

Can anyone explain the optics of this? What's going on...

2007-07-30 14:43:28 · 1 answers · asked by ? 5 in Weather

Life came from the ocean - if you believe in that keep reading, if not, this question will not be suitable to you (no offense, it just makes disproving me harder). Life began in the ocean, and then evolved into animals that eventually found their way onto land. Theoretically, we evolved from modern apes, and because we were better suited to survive and were able to eat more protein, our brain grew larger, and we became smarter.

Now - thinking that - wouldn't it be 99% feasible that there would be some kind of intelligent fish men/women in the oceans, which cover 75% of the earth. They wouldn't have been harmed as much as our species on land, because they are so far below in the water - and thus evolution would not have paused for their kind, but kept on going, to something truly magnificent - the highest point of evolution thus far.

Yes / No?

2007-07-30 14:42:57 · 18 answers · asked by spphat 2 in Biology

Will the sky turn dark or red or will it rain?

2007-07-30 14:41:21 · 15 answers · asked by gaamale79 1 in Astronomy & Space

2007-07-30 14:41:01 · 6 answers · asked by Paul C 1 in Astronomy & Space

2007-07-30 14:39:02 · 4 answers · asked by Anonymous in Mathematics

It's 2.38 am. They are squawking away. WHY????

2007-07-30 14:38:55 · 8 answers · asked by Part Time Cynic 7 in Zoology

How far does a rainbow go? I mean, what wavelengths?

2007-07-30 14:27:43 · 7 answers · asked by Anonymous in Weather

sinx/cos^2x dx from 0 to pi/3

This is how it was written in the quiz and I can't get it to go into the calculator written this way...

2007-07-30 14:22:41 · 5 answers · asked by Anonymous in Mathematics

when they just evolved in to birds

2007-07-30 14:21:36 · 13 answers · asked by lisa b 1 in Zoology

The entire day I spent in my house, windows closed. Not once did a mosquito bother me. Until I went to bed! Then she attacked!
How does she find me every night?

Why doesn't she go to the living room and hang out there?

It seems she is so small she should have to spend all night in the living room combing that room for an ear to buzz and feet to sting!

2007-07-30 14:14:26 · 11 answers · asked by ~~∞§arah T∞©~~ 6 in Other - Science

i have shoulder inflammation, so i was reccommened to take advil or Ibuprofen but i dont have them, is tylenol extra the strength the same?

2007-07-30 14:10:00 · 10 answers · asked by kundoggydawg 2 in Medicine

2007-07-30 14:02:20 · 5 answers · asked by Anonymous in Weather

Express in simplest radical form

6^(5/3)*a^)2/3)*n^(11/3)
It would be great if you could help me out!! I used to know how to do this when I took the course a few years ago...but for my math class we have to do a review packet and now I have no idea what to do!! Please answer soon!!

2007-07-30 14:01:29 · 7 answers · asked by Anonymous in Mathematics

The question is, using a graphing calculator solve the sum of this sequence.

{-3.12n+4.69},n=25

My calculator is an HP 49g + and I still can't figure this thing out.

2007-07-30 13:56:17 · 4 answers · asked by Anonymous in Mathematics

Quad. Equat. Claification please?
EXAMPLE:
1) x² +3x+1 = 0
2) [Sol] x²+3x=-1
3) (x+ 3/2)² -9/4=-1<--(The left side is changed to include the square of a ploynomial)
4) (x+3/2)²=4/5
5) x+3/2= √5/2
6) x=-3√5/2
*Writing a Quad. form equation in the form of (x-d)²=e is called completing a square*

My question is this, in step 3) where did the "3/2" and the "-9/4" come from?

We are started with the equation in step 1) x² -+3x+1 = 0 but we can't factor it, when and how do you pull out the two "fractions"?

2007-07-30 13:41:22 · 6 answers · asked by Anonymous in Mathematics

A roller coaster (420 kg) moves from A (5.00 m above the ground) to B (18.0 m above the ground). Two nonconservative forces are present: friction does -2.00 104 J of work on the car, and a chain mechanism does +3.00 104 J of work to help the car up a long climb. What is the change in the car's kinetic energy, KE = KEf - KE0, from A to B?

2007-07-30 13:40:24 · 3 answers · asked by Anonymous in Physics

In an electrolysis experiment, a student observed that his unknown metal anode lost 0.208g while a total volume of 96.30 mL of H2 was being produced. The temperature in teh laboratory was 25 degrees Celcius and the barometric pressure was 748 mm Hg. At 25 degrees Celcius the vapor pressure of water is 23.8 mm Hg. To find the mass of his metal, he filled in the blanks below. Fill in the blanks as he did.

PH2=Pbar-VPh2o =_______mm Hg=______atm
VH2=____mL=_______L
T=______K
nH2=_____moles nH2=PV/RT (where P=PH2)

1 mole H2 requires passage of ____________faradays

No. of faradays passed = ___________

Loss of mass of metal anode =_______g

No. grams of metal lost per faraday passed = no. grams lost/no. faradays passed=__________g=EM

The student was told that his metal anode was made of iron.

MM Fe=__________g. The charge n on the Fe ion is therefore__________.

Can anyone help? I'm confused....

2007-07-30 13:34:58 · 2 answers · asked by Anonymous in Chemistry

2007-07-30 13:31:38 · 4 answers · asked by Dominator. 2 in Physics

How do I find the radius of a sector of a circle if:

the area of the sector is 9.817 and the degree measure of the arc is 22.5.

How do I find the Radius??

2007-07-30 13:25:15 · 6 answers · asked by ems 2 in Mathematics

Since (-x)^2=(x)^2, we have log (-x)^2=log(x)^2, whence 2 log(-x)=2 log (x), and thence log (-x)=log(x).

What in the world does this mean????

2007-07-30 13:18:00 · 5 answers · asked by Mike 2 in Mathematics

and therefore if you make the right noise they will move a certain direction

2007-07-30 13:16:49 · 4 answers · asked by Anonymous in Other - Science

2007-07-30 13:16:00 · 1 answers · asked by CHARLENE S 1 in Earth Sciences & Geology

an electric dc circuit is attached to a 12 volt battery and has a 3 ohm resistor in it what is the current in an ac circuit with 120 volt and a 60 watt light bulb?

2007-07-30 13:14:06 · 2 answers · asked by Anonymous in Physics

2007-07-30 13:12:20 · 1 answers · asked by rsdre a 1 in Zoology

Have you heard of this http://technology.timesonline.co.uk/tol/news/tech_and_web/personal_tech/article1447178.ece

and if so what are your thoughts on it

2007-07-30 13:12:14 · 4 answers · asked by Thomas A 2 in Biology