Science & Mathematics - 10 February 2007

does anyone know this one?

2007-02-10 07:13:58 · 2 answers · asked by Anonymous in Chemistry

2007-02-10 07:13:22 · 2 answers · asked by Anonymous in Physics

The required range is in kilometers. Where can i find such circuits? Please help!

2007-02-10 07:13:14 · 2 answers · asked by curious 1 in Engineering

can anyone help?

2007-02-10 07:13:11 · 1 answers · asked by Anonymous in Chemistry

A magnetic field has a magnitude of 1.2 10e-3 T, and an electric field has a magnitude of 5.7 10e3 N/C. Both fields point in the same direction. A positive 1.8 µC charge moves at a speed of 2.9 10e6 m/s in a direction that is perpendicular to both fields. Determine the magnitude of the net force that acts on the charge.

Now, wouldn't I add the force of the magnetic and electric fields together to get the answer? I came up with .0183 but my homework site is telling me I'm wrong.

2007-02-10 07:11:13 · 3 answers · asked by Confused 1 in Physics

please help

2007-02-10 07:10:32 · 1 answers · asked by Anonymous in Chemistry

. . . . . . . . . x
If f(x) = ∫ t^2 dt, then f ''(x) =
. . . . . . . . . 2

2007-02-10 07:10:30 · 2 answers · asked by Olivia 4 in Mathematics

A sample or argon gas has a volume of 735mL at a pressure of 1.20 atm and a temperature of 112C. What is the volume of the gas in milliliters when the pressure and temp of the gas sample are changed to:
a. 658mm Hg and 281 K
b. 0.55 atm and 75C
c. 15.4 atm and -15C

2007-02-10 07:08:37 · 1 answers · asked by Emma 1 in Chemistry

Help me figure this out!

If f(x) = 7x^2 + 3x

Find the equation of the tangent line at x = 5

In the format y = [blank]x +/- [blank]

2007-02-10 07:08:22 · 4 answers · asked by Marla L. 1 in Mathematics

please give the answer in multiple units

2007-02-10 07:08:11 · 5 answers · asked by coolchess123 3 in Astronomy & Space

Alright, this problem is really giving me a hard time...

f(x)= sqrt(100-x^2) + 10arcsin(1/10x)
f'(x)=?

I get:

-x/sqrt.(100-x^2) + 10/sqrt.(1-x^2/100)

I'm able to differentiate it, but unable to properly simplify it. The answers are sqrts, like so:

sqrt(10+x / x-10) <-this is not the answer, but the format of the answers.

Any help would be greatly appreciated!

2007-02-10 07:07:28 · 2 answers · asked by other_user 2 in Mathematics

yes it is theory of great explosion which held 200million year ago it is prove all question which are uptill come in our mind like "what is glaxy" "what is expnding universe"."what is doppler effect show in our universe" i have soloution of all these question thank for reading this article.

2007-02-10 07:07:21 · 8 answers · asked by Anonymous in Astronomy & Space

This question must be answered using the laws of integers

2007-02-10 07:03:28 · 9 answers · asked by Anonymous in Mathematics

anyone please help!!

2007-02-10 07:02:08 · 5 answers · asked by Anonymous in Chemistry

2007-02-10 07:02:02 · 7 answers · asked by Anna H 1 in Biology

I don't understand how to do this problem and I was wondering if someone could help me. It's a two part question.
Part 1:
Let R be the relation on the set of ordered pairs of positive integers such that ((a,b), (c,d)) element of R if and only if ad=bc. Show that R is an equivalence relation.

Part2:
What is the equivalence class of (1,2) with respect to the equivalence relation in one above.

Thank you very much for the help!!!

2007-02-10 07:00:55 · 1 answers · asked by Anonymous in Mathematics

2007-02-10 07:00:22 · 6 answers · asked by Anonymous in Weather

2007-02-10 06:59:49 · 10 answers · asked by Anonymous in Earth Sciences & Geology

What problem might be introduced by this approach?

How would this affect the results of a ferric chloride test on the purified aspirn?

2007-02-10 06:57:00 · 1 answers · asked by mrkittypong 5 in Chemistry

Which is more 3/4s or 2/3s?

2007-02-10 06:56:19 · 15 answers · asked by lilbum94 1 in Mathematics

each inequality has to have a real world story match it please only help if you are really good at this

1. 7x is greater then or equal to 28

2. 3x+2y+5z<40

3. x^2+y^2 is greater then or equal to 100

each inequality needs a real life story could i please help

2007-02-10 06:54:29 · 3 answers · asked by Anonymous in Mathematics

BECAUSE HERE THE SKY GETS LIGHT AND THE CLOUDS GET DARK BUT IT COLD HERE .

2007-02-10 06:54:19 · 3 answers · asked by Anonymous in Weather

How many 1.25 grian aspirin tablets would produce a lethal dose for a 180 pound adult?

2007-02-10 06:53:10 · 3 answers · asked by mrkittypong 5 in Medicine

Benzene, C6H6, is reacted with bromine, Br2, to produce bromobenzene, C6H5Br, and hydrogen bromide, HBr, as shown below. When 40.0g of benzene are reacted with 95.0g of bromine, 65.0g of bromobenzene is produced.

C6H6 + Br2 ----> C6H5Br + HBr

1. Which compound is the limiting reactant?
2. What is the theoretical yield of bromobenzene?
3. What is the reactant in excess, and how much remains after the reaction is completed?
4. What is the percentage yield?

2007-02-10 06:52:58 · 2 answers · asked by ~SMCM101~NYC 2 in Chemistry

Jose finds out he walks at the rate of 2.5 meters per second. His brother, Luis, walks at 1 meter per second. They want to have a race but Jose doesn't want Luis to lose because he wil cry. So, he doesn't want to make it obvious he is letting him win so he will walk his regular speed but let Luis have a 45 meter head start. What would be a good distance for the race to be so Luis winning won't be obvious? Also, what is a function rule for both Jose and Luis?

no this is not my homework

2007-02-10 06:51:54 · 6 answers · asked by Anonymous in Mathematics

Researchers found that the arginine code AGG is poorly represented in genes of E.coli. Interestingly, they also found that this triplet, when present, binds to the ribosome 7-9 base pairs upstream from the starting ATG triplet (methionine). What does this information suggest in regard to the AGG codon?
A. it is a codon rarely found in this bacterium
B. it is conserved in most prokaroytic organisms
C. it may have a regulatory function in the cell
D. both B and C
E. A, B and C

2007-02-10 06:50:42 · 4 answers · asked by Anonymous in Biology

i dont get this math
1. z-100=100
2.5-d=1
3.40-g-20

2007-02-10 06:50:05 · 7 answers · asked by ♥_chick 1 in Mathematics

13. A population of 2800 flowers is in Hardy-Weinberg equilibrium, and 2352 of them are red in color. The red allele [R]is the dominant allele; the allele for white color [r] is recessive. What would be the frequency of heterozygotes in the population?
A. .03
B. .16
C. .48
D. .71
E. .84

2007-02-10 06:49:47 · 3 answers · asked by Anonymous in Biology

7. If radioactive sulfur (35S) is used in the culture medium of bacteria that harbor bacteriophage viruses, it will later appear in:
A. bacterial RNA
B. bacterial cell walls
C. viral DNA
D. viral RNA
E. viral coats

2007-02-10 06:48:52 · 4 answers · asked by Anonymous in Biology

6. Suppose radioactive thymine was added to an actively dividing culture of E.coli bacteria. What would happen if a cell replicated once in the presence of this radioactive base?
A. one of the daughter cells, but not the other, would have radioactive DNA
B. neither of the two daughter cells would be radioactive
C. all four bases of the DNA would be radioactive
D. radioactive thymine would pair with nonradioactive guanine
E. DNA in both daughter cells would be radioactive

2007-02-10 06:48:07 · 2 answers · asked by Anonymous in Biology