Science & Mathematics - 8 November 2007

39. Three of the primary components of air are carbon dioxide, nitrogen, and oxygen. In a sample containing a mixture of only these gases at exactly one atmosphere pressure, the partial pressures of carbon dioxide and nitrogen are given as P co2 = 0.285 torr and P n2 = 593.525 torr. What is the partial pressure of oxygen?

2007-11-08 12:46:47 · 3 answers · asked by loveme 1 in Chemistry

Please explain.

2007-11-08 12:45:57 · 4 answers · asked by Karla F 2 in Biology

Birthday paradox- in a random gathering of 23 people, there is a 50% chance that two people will have the same birthday.

2007-11-08 12:43:17 · 4 answers · asked by Kaylight 1 in Mathematics

The plant I'm talking about looks like this: http://pbskids.org/backyardjungle/files.php/266198_discovery_f.jpg

2007-11-08 12:43:08 · 3 answers · asked by someguy123 3 in Botany

A fisherman in a boat is using a "10-lb test " fishing line. This means that the line can exert a force of 45 N without breaking.. (1lb=4.45N).

(A) How heavy a fish can the fisherman land if he pulls the fishup vertically at constant speed?

B: If he accelerates the fish upwards at 2.0 m/s^2 what maximum weight fish can he land?


Now i have no clue what to do in this. I am so lost. Im pretty sure this has to do with Newtons laws or soemthing. Any help would be awesome!

2007-11-08 12:38:39 · 2 answers · asked by Anonymous in Physics

2007-11-08 12:38:19 · 3 answers · asked by robvanyam 1 in Earth Sciences & Geology

Which of the following methods would not produce ammonia?

(1) Heating a nitrate solution with aluminium powder in sodium hydroxide
(2) Heating ammonium chloride with calcium hydroxide
(3) Heating ammonium sulphate with sodium hydroxide
(4) Heating ammonium sulphate with dilute hydrochloric acid

The answer is (4)..Why is that so? I really don't understand...Please explain to me...Thanks

2007-11-08 12:37:46 · 2 answers · asked by Anonymous in Chemistry

I was on community security patrol about 10:00 pm., checking out some of the popular teen party areas in the woods near the river. I drove down a path to about 50 feet from the end, where there is about a ten foot drop-off to the water. Looking over the water to the northeast, I could see a fairly bright light, about as bright as Jupiter. With the airport a few miles behind me, I figured it was an incoming plane. It was at a low altitude, about 20 degrees.

I stayed awhile because it was nice and peaceful. I noticed that the light didn't change. After awhile, it was clear that it was not moving, so I thought it might be a helicopter past the other side of the river. There were no towers in that direction. It remained fixed. Even though this part of the sky is fairly bright because of Baltimore being nearby, I started to wonder whether it might be a supernova. I was a pretty serious amateur astronomer and got excited about that. I knew it couldn't be a planet.

2007-11-08 12:37:23 · 6 answers · asked by Brant 7 in Astronomy & Space

Earlier I was telling myself it had been two hours and I could take another cough drop. Then about 20-30 minutes later I took one. The thing is, after I finished it, I realized I had been talking abiut taking one earlier. And I actually forgot if I took one that half hour earlier.

Now, if I did end up taking two in that short period of time (because you're only supposed to have one every two hours), um, what would happen??

2007-11-08 12:36:38 · 7 answers · asked by i use Y!A 1 in Medicine

i need what elements make up pool chlorine elements as in on the periodic chart

2007-11-08 12:34:56 · 2 answers · asked by Rissa 2 in Chemistry

Like...the way they breed cats with rabbits. Has there ever been a case where somone takes a human gene with one of our closest relatives of nature?

2007-11-08 12:34:38 · 8 answers · asked by ZebraRider 2 in Zoology

There's two problems. Oh and these are "Explain your thinking" problems.

1. How do you tell if 2 ratios form a proportion or not?

2. What is the percent proportion? Tell how you can use it.

Thank you so much for those who are will to help me! Oh, one more thing, these are 7th grader questions so bare with me. XP

2007-11-08 12:33:53 · 1 answers · asked by Anonymous in Mathematics

Genetic problems please????????????????
16. In watermelons, solid green (G) color is dominant over striped pattern (g), and short shape (S) is dominant over long shape (s). What are the genotype and the phenotype of the offspring for a striped homozygous short watermelon and a green, short watermelon that’s heterozygous for both traits?
Answer is ggS_ and GgSs
So my question how do we know if the first one is ggSs or ggSS. They did not even tell us?

how in this world am i going to find out if dominant gens are homo or herto pleaseeeee help me

2007-11-08 12:30:14 · 4 answers · asked by Anonymous in Biology

Oxygen is combustible and is therefore can be used as fuel. Could our bodies become so efficient that we would not need to injest external sources of fuel? A group of people known as breatharians claim to have done just that.

2007-11-08 12:30:07 · 6 answers · asked by Wait a Minute 4 in Biology

Need an expert opinion.....

I think crossing over for meiosis occurs very early in the prophase 1 stage. But I need the other three parts of the question.

2007-11-08 12:30:04 · 2 answers · asked by Melissa 2 in Biology

36.0g of water contains how many g of oxygen?

2007-11-08 12:29:45 · 2 answers · asked by Mio 2 in Chemistry

one paragrapgh is enough ! =] thank you !best answer gets 10 ! please make it clear! =]

2007-11-08 12:29:19 · 5 answers · asked by Anonymous in Other - Science

A solid is formed by adjoining two hemispheres to the ends of a right circular cylinder. The total volume of the solid is 12 cubic centimeters. Find the radius of the cylinder that produces minimum surface area.

Here's what I did:
1. drew the solid. It looks like a pill.
2. labelled the radius of the cylinder "r" and the height "h".
3. Used the volume equation to solve for h in terms of r. I got h = (12 - 4/3*pi*r^3) / pi*r^2.
4. Plugged that value of h into the equation of the solid's surface area and simplified.
5. Differentiate but the equation looks messy. I don't know how I can set that equation equal to zero and solve for r.

Or if there's a better method, please feel free to teach me that.

2007-11-08 12:28:20 · 2 answers · asked by coconutty beanz xD 4 in Mathematics

I really need this answer or I'm going to fail my science homework.

2007-11-08 12:27:47 · 4 answers · asked by piano man 1 in Physics

2007-11-08 12:26:50 · 4 answers · asked by Anonymous in Mathematics

The problem:
How many molecules is in each of the following?
1.50 X 10^23 molecules NH3

I just need help to solve one and then I can do the rest on my own. How do I solve this equation?
These are the others:
1 billion (1 X 10^9) molecules O2
6.02 X 10^22 molecules Br2
4.81 X 10^24 atoms Li

2007-11-08 12:26:21 · 3 answers · asked by Anonymous in Chemistry

In general, we believe the smaller the animal, the less intelligent. The larger the animal past the size of humans, the less intelligent (in general). Dolphins are smarter than Hippos that are smarter than Elephants.

2007-11-08 12:23:28 · 8 answers · asked by Wait a Minute 4 in Zoology

(a) In what direction, relative to the shore, does Dave's boat go?
°
(b) How long does it take Dave to cross the river?
s
(c) How far downstream is Dave's landing point?
m


I am trying to use the pathag therom, but my anwers are still coming out wrong. The trig functions are also confusing so if someone could explain them to me that would be great

2007-11-08 12:21:19 · 2 answers · asked by Trying M 1 in Physics

Not referring to bestiality. Scientifically, if you join human egg to horse sperm in a test tube and implant them in the womb --> birth of a centaur?

2007-11-08 12:19:57 · 10 answers · asked by Tree 2 in Biology

2007-11-08 12:19:42 · 8 answers · asked by ツ 1 in Zoology

A 2.00-kg metal object requires 5020 J of heat to raise its temperature from 20.0°C to 40.0°C. What is the specific heat capacity of the metal?

2007-11-08 12:19:21 · 1 answers · asked by 1337Haxor 2 in Engineering

Solve for C please.

Using factorization

2007-11-08 12:18:31 · 3 answers · asked by Anonymous in Mathematics

A.is single-stranded

B.contains a differant sugar molecule

C.contains the nitrogen base uracil

D.all of the above

2007-11-08 12:18:26 · 6 answers · asked by Anna 2 in Biology

2007-11-08 12:18:25 · 2 answers · asked by Anonymous in Chemistry

Solving Quadratics

x(squared)+5x=0

2007-11-08 12:18:19 · 5 answers · asked by Rosey 2 in Mathematics