Science & Mathematics - 14 September 2007

If f(n) is O(g(n)) and d(n) is O(h(n)), how can I prove that the summation f(n) + d(n) is O(g(n) + h(n))? It is obvious that this is true, but how do you prove it?

2007-09-14 11:15:08 · 1 answers · asked by jaden404 4 in Mathematics

...................... i need a fraction answer please

2007-09-14 11:08:47 · 10 answers · asked by Anonymous in Mathematics

A rocket driven sled runnung on a straight level track has been used to study physiological effects on large accelerations on astronauts. One such sled can attain a speed of 361 m/s in 1.7 s starting from rest. What is the acceleration of the sled, assuming it is constant? Answer in units of meters per seconds squared(m/s^2)

2007-09-14 11:05:54 · 4 answers · asked by Anonymous in Physics

...................... i need a fraction answer please

2007-09-14 11:04:52 · 8 answers · asked by Anonymous in Mathematics

2007-09-14 11:04:36 · 9 answers · asked by loppy 2 in Mathematics

Find the area of ONE loop of the graph of the polar function

r = 4cos3Ө

Area = 1/2 INT Ө1 --> Ө2 r^2 dӨ

PLEASE SHOW WORK! Including what the integral begins and goes until.

I can't figure out the limits of the integral... I have no idea where to start and stop to get just ONE loop!

2007-09-14 11:00:37 · 2 answers · asked by Anonymous in Mathematics

2007-09-14 11:00:13 · 3 answers · asked by Sally J 1 in Geography

So you know how all those "smarty-pants scientists" say that the universe is constantly expanding? Well anything outside earth is the universe and it goes on forever you know? Well if it is constantly expanding, where can it expand to? There is nothing beyond it....HA NO SO SMART NOW ARE YA SUCKERS!

2007-09-14 10:59:43 · 13 answers · asked by xx Call me Lolo xx 3 in Astronomy & Space

explain clearly on how to solve???
use the variable N???....

1)The sum of two numbers is 18.If the larger number is twice the smaller number find the two numbers...
small no.= x so smaller number is 18???
bigger no= 2x-18 bigger number 12???
solution?
x+2x-18=18
3x+18+18 x=12 18-12=6 6x3+18???x=18
3x/3+36/3
is this right or what??

2) One number is one more than 3 times the smaller number.Their sum is 69.Find the numbers.haha still use the small...bigger representation like mine.(cant understand this?!!)

3)The larger of 2 no. is 12 more than half the smaller number find their number if their sum is 30.

4)Find 2 numbers whose sum is 31,one of which is 5 less than twice the other.

sorry if it's to many i just cant understand word problems...
good luck and have a nice day

2007-09-14 10:51:43 · 3 answers · asked by aveecd 1 in Mathematics

According to Conrady's standard a 70mm achromatic refractor must have f/14 - many are close to this.But a 125mm aims fot f/25 and 150mm - f/30!!!
The big achromats on the market are f/10 - f/8 and they cost hell a lot of money and if that above is right they should perform way worse at the same magnification and you would be better off with the mid ones and is that the case???Sure not!
If chromatic aberation is caused by rays falling at steeper angle and thus get more refracted then if the f-ratio is kept same it's fine.The only possible explanation I see comes from the fact that a bigger f/10 refractor will give more magnification with same eyepiece than the smaller refractor so if the smaller one is given such an eyepice (to reach that mag.) It will suffer the same chromatic aberration at f/10 but because of diffraction and other optics limitations it will be out of the question to detect it in so deteriorated image.

2007-09-14 10:45:08 · 4 answers · asked by OK 1 in Astronomy & Space

If you watch high altitude balooons, they just float into the upper atmosphere. Gravity does not hold them back. Can't we use a slower, gentler means of thrust to lift satellites and space shuttles into orbit? Just trying to think outside the box here... What would keep a ship from breaking out of orbit at a very slow speed? It seems this would be much safer than strapping a highly explosive fuel tank to the capsule.

2007-09-14 10:44:40 · 11 answers · asked by Michael 4 in Astronomy & Space

Why is it so difficult to stop or turn a supertanker?

2007-09-14 10:44:16 · 4 answers · asked by kntagler 1 in Physics

I kinda need to know this within 3 days of 9/14/07, so if you know the answer, please tell it to me quick.....It is for homework, and i have looked thru my notes, and have looked thru my book, and it says nothing about this, so if you could help me out here, i will be forever grateful.







Thank you soooooooooooo much!!!


~~^scottyo^~~

2007-09-14 10:42:43 · 5 answers · asked by Anonymous in Botany

x + 2y = 8

2007-09-14 10:40:45 · 10 answers · asked by antwon 1 in Mathematics

r = 2(1-cosӨ)

Find the arc length of the polar curve ^ from 0 to п (pi)

formula for Arc Length = INT 0 --> п (pi) [f'(Ө)^2 + f(Ө)^2]^1/2 *dӨ

PLEASE show work! I keep getting back to the original problem. HELP!

2007-09-14 10:37:08 · 2 answers · asked by Anonymous in Mathematics

I need some help for some medical research. i want to measure the "negative" pressure generated by small syrignes of about volume 5 -10 ml I have a digitron 2082 differential manometer for this. My problem is that there is some dead space between the syringe and the measuring membrane, and i feel that it may influence the results, becuase the air in the dead space may expand. how can i get rid of this dead space? can i fill it with water, or is there some other liquid that i can use with out damaging the manometer ?

2007-09-14 10:36:30 · 2 answers · asked by Nirmala 4 in Engineering

what is the inverse of the square root of 6 minus e^(2x)?
(6-e^(2x))^.5 if you're confused of how to format that. This was my incorrect course of action:

1. replace x with y. x = sq. root (6-e^(2y)
2. square each side. x^2 = 6-e^(2y)
3. subtract 6 from each side. x^2-6 = -e^(2y)
4. multiply each side by -1. 6-x^2= e^(2y)
5. mutiply each side by the natural logarithm. ln (6-x^2) = ln e^2y
6. Isolate y. [ln(6-x^2)]/2=y

That made sense to me but doesn't work when you graph it.

2007-09-14 10:34:47 · 2 answers · asked by ILuvTaraReid 2 in Mathematics

what is 22% of 5?
Do I change 22% to .22?

2007-09-14 10:30:52 · 15 answers · asked by Anonymous in Mathematics

please tell me how you did it and the name of the procedure or theorem

2007-09-14 10:29:05 · 2 answers · asked by nico 2 in Mathematics

What is 40 / 4 + 6 * 4 – 2

2007-09-14 10:27:51 · 5 answers · asked by Anonymous in Mathematics

2x + y = 4
x + y = 3

2007-09-14 10:26:24 · 4 answers · asked by antwon 1 in Mathematics

, san gabriel valley area. We don't want to kill them, but we can't let them go in the neighborhood only to be killed by someone else eventually. What are their chances of survival in the wild near a creek in the mountains? What will they eat? Thankyou.

2007-09-14 10:25:12 · 4 answers · asked by Ilooklikemyavatar..exactly 3 in Other - Science

A sodium hydrogen carbonate-sodium carbonate buffer is to be prepared with pH of 9.40.
a) What must the [HCO_3^-]/[CO3^2-]
b) How many moles of sodium hydrogen carbonate must be added to a liter of 0.225M Na2HCO3 to give this pH?(assume no volume change)

2007-09-14 10:23:03 · 1 answers · asked by Anonymous in Chemistry

2007-09-14 10:23:01 · 2 answers · asked by Anonymous in Medicine

A factory has 3 machines capable of producing cogs. All 3 machines together can produce 460 cogs per hour. Machine A and machine B together produce 360 cogs per hour, while machine A and machine C together can produce 310 cogs per hour. How many cogs per hour can machine A produce?

2007-09-14 10:21:53 · 3 answers · asked by Anonymous in Mathematics

RNA?

2007-09-14 10:21:27 · 3 answers · asked by Terri L 2 in Biology

2007-09-14 10:19:04 · 5 answers · asked by doodee889 1 in Mathematics

2007-09-14 10:16:11 · 11 answers · asked by Anonymous in Mathematics

2007-09-14 10:15:30 · 3 answers · asked by idkkkk 2 in Earth Sciences & Geology

2007-09-14 10:13:05 · 3 answers · asked by Yellow1029 1 in Earth Sciences & Geology