Science & Mathematics - 19 September 2007

2007-09-19 15:42:03 · 9 answers · asked by Anonymous in Mathematics

Science books tell us that the temprature of outerspace is something like 4 degrees Kelvin. How does one arrive at that conclusion? What is the temprature being measured from, or is it a theoretical temprature?

2007-09-19 15:40:25 · 2 answers · asked by bluecuriosity 2 in Physics

Since gas expands in all directions, why, in a jet engine, does it create forward thrust, what keeps it from pushing air though the intake?

2007-09-19 15:37:24 · 2 answers · asked by gocougars1992 2 in Physics

While watching Apollo 13 the movie I got confused as to how the inside of spacecraft would drop temprature in outerspace.

Knowing that even spacesuits face the problem of dissipating heat generated by the wearing astronaught (a vaccume is a perfect insulator), how can one explain that a capsule containing an entire crew would drop below freezing?

Wouldn't the heat radiated away in infared be overcome by direct sunlight on the pod in space?

2007-09-19 15:36:30 · 4 answers · asked by bluecuriosity 2 in Astronomy & Space

Does anybody know any places interesting in Georgia in the ineer coastal plains?

2007-09-19 15:35:51 · 2 answers · asked by Anon_3664 2 in Earth Sciences & Geology

what is it?!

2007-09-19 15:34:44 · 2 answers · asked by Anonymous in Earth Sciences & Geology

2007-09-19 15:33:18 · 3 answers · asked by myron k 1 in Chemistry

2007-09-19 15:32:17 · 6 answers · asked by Anonymous in Medicine

Which structure is the site of the synthesis of proteins that may be exported from the cell?
1 plasmodesmata
2 tight junctions
3 lysosomes
4 rough er
5 golgi vesicles
i just wanted to check my answer, i think it is 5, bec of the "export" and proteins are slightly modified at the golgi too

2007-09-19 15:32:02 · 3 answers · asked by Anonymous in Biology

2007-09-19 15:31:57 · 2 answers · asked by Anonymous in Earth Sciences & Geology

2007-09-19 15:31:18 · 11 answers · asked by Buah_Life_Is_Beautiful 1 in Geography

cosθ/(1-tanθ)=(cosθ-1)/(1-〖sec〗^2 θ)

2007-09-19 15:26:32 · 1 answers · asked by MAN T 1 in Mathematics

Magnesium metal reacts with HCl solution, liberating H2 gas and generating Mg2+ cations in solution. A 1.015-g sample of Mg metal is added to 50.0 mL of a 4.00 M HCl solution, and the reaction goes to completion. How many g of H2 are formed?

THX A LOT FOR HELPIN ME..I REALLY APPRECIATE IT GUYSS! IT'S DUE TOMORROW...N I HAVE NO CLUE WHT TO DO!!

2007-09-19 15:26:32 · 5 answers · asked by Anonymous in Chemistry

2007-09-19 15:26:13 · 1 answers · asked by Anonymous in Other - Science

Analyze the following argument

If n is a real number such that n>2 , then n^2 >4 . Suppose that n less than or equal to 2, then n^2 is less than or equal to 4.

a) it is valid
b) It is not valid because it begs the question
c) It is not valid because it denies the hypothesis
d) It is not valid because it affirms the conclusion

2007-09-19 15:24:42 · 1 answers · asked by Corian 2 in Mathematics

I have two questions regarding vectors. Can someone please help.

1)A person desires to reach a point that is 6.10 km from her present location and in a direction that is 35.0° north of east. However, she must travel along streets that are oriented either north-south or east-west. What is the minimum distance she could travel to reach her destination?

2)A car is driven east for a distance of 46 km, then north for 34 km, and then in a direction 26° east of north for 29 km. Draw the vector diagram and determine the total displacement of the car from its starting point.
find Magnitude

3) Vectors:
a = (5.0 m) i + (3.0 m) j
b = (-10 m) i + (3.0 m) j
What is the direction of a + b?


Find Direction ° (counterclockwise from east)

2007-09-19 15:23:22 · 1 answers · asked by illfolkuup 1 in Physics

base is 2 for the logs but i cant make 3 a base of 2. so how do i solve for x?

2007-09-19 15:23:19 · 7 answers · asked by C.L. ~Raptors~ 4 in Mathematics

what is the density of a 5 g piece of metal that has a volume of 2cm

2007-09-19 15:22:39 · 7 answers · asked by Anonymous in Chemistry

Write the english phrase as an algebriac expression

2007-09-19 15:21:12 · 8 answers · asked by slamdunker3 1 in Mathematics

1. passive
2. humoral
3. cell-mediated
4. nonspecific

2007-09-19 15:17:43 · 2 answers · asked by peter a 3 in Biology

A collection 17 coins of consisting of nickels and dimes is worth $1.15. How many dimes are there?

2007-09-19 15:16:11 · 8 answers · asked by Anonymous in Mathematics

College biology lab
testing the growth of oral bacteria in different pH's

2007-09-19 15:14:13 · 3 answers · asked by Jennifer 1 in Biology

2007-09-19 15:13:59 · 11 answers · asked by jimmy 1 in Physics

Explain how u got this answer please, I'm taking a quiz about this tomorrow.

2007-09-19 15:13:28 · 11 answers · asked by Slim24/7 5 in Mathematics

the question is to generally explain the difference between each. Gycolysis and Krebs cycle/Electron transport.

2007-09-19 15:13:09 · 2 answers · asked by Anonymous in Biology

Explain how u got this answer please, I'm taking a quiz about this tomorrow.

2007-09-19 15:12:27 · 2 answers · asked by Slim24/7 5 in Mathematics

We did a blood typing experiment in class the other day and I had trouble reading my results. I thought that I might be O+ because I couldn't really see any clumps forming with my blood interacting with the anti-A or anti-B serum. I called my teacher over to ask him and he looked, pointed out a couple tiny clumps, and said that my results meant that I was AB+. My dad is O+ and my mom is A+ and, from my understanding of genetics, that would mean that I would have to be A+ or O+ right? Could the test be wrong or is my dad not my biological father?

2007-09-19 15:12:27 · 5 answers · asked by little_ash_2003 3 in Biology

An electron of mass 9.11 10-31 kg has an initial speed of 5.00 105 m/s. It travels in a straight line, and its speed increases to 6.00 105 m/s in a distance of 9.00 cm.
(a) Assuming its acceleration is constant, determine the force exerted on the electron.
N (in the direction of motion)

if tried but i can't figure the time and if i get the time i can find the acceleration and the force,please help

2007-09-19 15:11:55 · 4 answers · asked by Dustin 1 in Physics

A race car driver has a car that can accelerate at 5.9 m/s~2 (meters per second squared). He races against a souped-up stock car. Both start from rest, but the stock car leaves 1.0 seconds before sports car. The stock car moves with constant acceleration of 3.6 m/s~2 (meters per second squared).

1) Find time it takes for race car to overtake stock car
2) Find the distance that they go before they are side by side
3) Find velocity of both cars when they are side by side

2007-09-19 15:10:16 · 1 answers · asked by Rennix 2 in Physics

A magnet produces a 0.30 T field between its poles, directed to the east. A dust particle with charge q = -8.0 10-18 C is moving straight down at 0.30 cm/s in this field. What is the magnitude and direction of the magnetic force on the dust particle?

2007-09-19 15:09:56 · 1 answers · asked by Anonymous in Physics