Science & Mathematics - 13 October 2007

200(10-200x/450+x) = 1.1(2000)
how to find x
please list all step

2007-10-13 12:33:42 · 2 answers · asked by tsz 1 in Mathematics

2007-10-13 12:33:01 · 14 answers · asked by Ptericytol 1 in Astronomy & Space

2007-10-13 12:21:54 · 6 answers · asked by jose 1 in Geography

2007-10-13 12:18:20 · 11 answers · asked by Anonymous in Astronomy & Space

Please including physics formula and explanation, thanks!

2007-10-13 12:14:18 · 3 answers · asked by ice_seb 2 in Astronomy & Space

int f(x),x,0,9=4

int x*f(x^2),x,0,3=?

2007-10-13 12:13:20 · 2 answers · asked by Sage 1 in Mathematics

Sudden thought: Imagine a dictionary containing all the words in a language. Whatever the word we want do define in that language, we need other words (of the same language) to define it, right? For example, if the definition of "chair" is "object used to seat on", and if I didn't know what that means, I would have to go search for the meanings of "object", "used", "to", "seat" and "on" (on the same dictionary). Doesn't this result ultimately in some kind of logic absurdity, when we will be defining words in a loop, ending up trying to explain words with words we are trying to define? Would we need to have self-defining or self-explanatory words? What do you think?

2007-10-13 12:01:05 · 5 answers · asked by Butterfly 2 in Mathematics

If f(x) + x^2[f(x)]^5 = 34 and f(1) = 2, find f '(1).

how do i do this??? :(

2007-10-13 12:00:35 · 2 answers · asked by jennamcc224 1 in Mathematics

a power series representation for (1 -t^2)^-1.

2007-10-13 11:58:39 · 1 answers · asked by Anonymous in Mathematics

I understand that some people will say there's no such thing. I want to hear from those who have had experiences either way..Tell your experiences to show there is or isn't such a thing as black magic.Experiences only please..not opinions or beliefs. Thanks.

2007-10-13 11:57:42 · 8 answers · asked by Deenie 6 in Paranormal Phenomena

if it's inverting or non-inverting or other?

2007-10-13 11:57:24 · 2 answers · asked by Anonymous in Engineering

I get bored easily. Are their any fun ways to study by myself nd not with a group. Thank you so much

p.s the subject is science :D

2007-10-13 11:55:41 · 13 answers · asked by Live2Run 4 in Mathematics

2007-10-13 11:55:03 · 13 answers · asked by jonathan beechwood 2 in Earth Sciences & Geology

i know this isn't a hard question, but i can't think of the answer right now (brain fart).. please help!

Solve for x:

(3x/7) -3 = 6

a. 21
b. 7
c. -14
d. -21

2007-10-13 11:53:21 · 11 answers · asked by Anonymous in Mathematics

A periodic sinuous track is installed on an uniform plane slope, such that it intersects the straight fall line at regular intervals. A boxcar with wheels rolls without friction down this track, so that if left to itself it will gain speed as it descends due to gravity alone. Is it possible to build a mechanical apparatus wholly inside the boxcar, containing its own energy source, that will counteract this freefall, so that the boxcar can maintain speeds not exceeding some maximum? No use of jets or propellers or magnets interacting with the world outside the boxcar is allowed, this is a purely Newtonian problem, the apparatus must be totally enclosed inside the boxcar. Assume that the wheel design guarantees that the boxcar will never derail, like a roller coaster car. Also assume that the boxcar is able to dissipate heat energy from its descent, which is necessary in order to maintain average speed.

2007-10-13 11:52:18 · 4 answers · asked by Scythian1950 7 in Physics

please show the workings... thank you very much!!! ^v^

2007-10-13 11:48:54 · 10 answers · asked by xxx 1 in Mathematics

Please give me the answer on the ------------------------ (not more than three words)

2007-10-13 11:40:47 · 3 answers · asked by bad gambler 1 in Geography

Given that 2 is a generator of the cyclic group U(25), how do you find all of the generators of U(25) listed as powers of 2???

2007-10-13 11:40:04 · 2 answers · asked by Anonymous in Mathematics

How can I find all of the generators of order 9 in Z_36??

2007-10-13 11:32:55 · 1 answers · asked by Anonymous in Mathematics

3H_2 (g) + N_2 (g) ==> 2NH_3 (g)

please note that the underscore denotes subscript
(ex. H_2O

2007-10-13 11:30:32 · 4 answers · asked by Anonymous in Chemistry

Crude oil is the result of Carbon based sediments which get covered by other sedimentation, if you add the right amount of pressure and heat then crude oil is the result, my question is, is there a way to replicate this process synthetically?, there are Synthetic diamonds that are created in the lab and they replicate the conditions that make diamonds form, is there a way to do the same with Crude Oil?

2007-10-13 11:28:48 · 5 answers · asked by Finswimmer 2 in Earth Sciences & Geology

If two metals that start at the same temperature and we add heat- metal B changes water from 5ºC to 15ºC, and metal A changes the temperature of the water from 5ºC to 45ºC, which metal has the higher specific heat?

2007-10-13 11:27:58 · 2 answers · asked by Linda C 1 in Chemistry

can someone tell me what:

A) The HCF of 315 is
B) The HCF of 1350 is

C) The LCM of 315 is.
D) The LCM of 1350 is.

oh and please can u ryt the letter next to the answer so i know which one u mean

thankyou in advance x:x :)

2007-10-13 11:27:51 · 3 answers · asked by x Animal Lover x 2 in Mathematics

i dont get it

2007-10-13 11:27:36 · 2 answers · asked by LastHorcrux 3 in Earth Sciences & Geology

Question:
Suppose that a and b are integers and that a|b and b|a.
Prove that a=b or a=-b.

My answer to the question:
Since a|b there is an integer z such that b=a*z
Since b|a there is an integer w such that a=b*w
Substitute b=a*z to a=b*w,
a=a*z*w
a/a=z*w
z*w=1

Multiply b=a*z and a=b*w,
a*b=a*z*b*w
a*b=a*b*(z*w)
a*b=a*b*1
a*b=a*b

Then I am stuck from here, I cannot figure out how to prove a=b and a=-b from this point. Can you help me please?

2007-10-13 11:26:40 · 6 answers · asked by pink 2 in Mathematics

An object at rest has three forces acting on it. The first force is 129 N acting along the positive x-axis. The second force is 159 N acting at an angle of 20 degrees relative to the positive x-axis.

2007-10-13 11:24:39 · 1 answers · asked by Anonymous in Physics

?

2007-10-13 11:16:13 · 3 answers · asked by inside and out 1 in Earth Sciences & Geology

Determine the set of points at which the function f(x; y; z) = square root(x + y + z) is continuous.

How are you supposed to determine the interval of continuity like that? I can pick random numbers and try them out but it really doesn't help, it will just take forever.

2007-10-13 11:15:10 · 1 answers · asked by Daniel B 2 in Mathematics

show that if p is a prime number, then the abelian groups C_(p^2) and (C_p)x(C_p) are not isomorphic. (even though they have the same number of elements.)

2007-10-13 11:13:45 · 1 answers · asked by greenheaven 1 in Mathematics

2007-10-13 11:12:48 · 11 answers · asked by superpug92 2 in Zoology