Science & Mathematics - 13 July 2007

Establish the Trig Identity

Let t = theta

(csc(t) + cot(t)(csc(t) - cot(t)) = 1

2007-07-13 23:15:48 · 7 answers · asked by Sharkman 1 in Mathematics

Establish the Trig Identity

Let t = theta

sin(t)(cot(t) + tan(t)) = sec(t)

2007-07-13 23:13:59 · 9 answers · asked by Sharkman 1 in Mathematics

i need som information abut tomato farming

2007-07-13 22:42:25 · 3 answers · asked by shahram ghandchi 1 in Agriculture

2007-07-13 22:37:41 · 3 answers · asked by Anonymous in Medicine

Need someone's help with the following question?
K Brown owns a large department building consisting of 200 units. From past experience, it is known that all 200 units can be rented out at $800 per month per unit and only 180 units can be rented if the monthly rent is $1000 per month. Assuming that the demand for apartments is a LINEAR FUNCTION of the monthly rent charged per unit, determine the total revenue AS A FUNCTION of monthly rent per unit. What monthly rent per unit will maximize the total revenue?

2007-07-13 22:35:27 · 4 answers · asked by gab BB 6 in Mathematics

Greatest common factor:
79 and 80
36 and 84
12,30,126
Least common multiple
4,2,7
5,8,12

2007-07-13 22:18:42 · 5 answers · asked by Jeniv the Brit 7 in Mathematics

According to dictionaries, osmotic pressure is the pressure exerted by a dissolved substance in virtue to its molecular motion. But does the 'dissolved substance' mean the solute or the solvent? Does the pressure refer to the pressure exerted by the solute or the solvent molecules?

2007-07-13 22:12:27 · 5 answers · asked by Anonymous in Chemistry

(1) Why do you blindly believe in science that is mixed with non-scientific truths?; (2) According to your world-view answer the following: (a) What is your value; (b) Where did you come from; (c) What will happen when you die; (3) How can a Big Bang come from nothing?; (4) If the Earth is millions or billions of years old - why isn't there a much larger desert in existence (than the Sahara)?; (5) IF the Earth is billions of years old - why hasn't the Gulf of Mexico been completely filled with mud? The Mississippi River deposits 80,000 tons of sediment an hour.; (6) IF the Earth is millions or billions of years old - why does oil still have pressure? It is held under pressure at 20,000 psi for approx 10,000 years. ; (7) IF Earth is billions of years old why doesn't the present population numbers reflect that amount of time?; (8) How can 'nothing' become hot liquid rock to primodial soup and become all known kinds of life on Earth?; (9) Why isn't matter evenly distributed?

2007-07-13 22:08:31 · 19 answers · asked by whathappentothisnation 3 in Earth Sciences & Geology

2007-07-13 22:07:10 · 18 answers · asked by frankie40216 1 in Mathematics

Astrologers, Vs,,Astronomers,,?
why is it when some people r interested in astrology, all of a sudden,, a suppose Astronomer, has to put their 2 cents in as for instance,, how ridiculous, you astrologers r to compare us Astronomers, to you! some seem to even attact with words like were no where even close to astrologers, and some of us r offended when you compare us Astonomer's to your astrological views,,as we astronomers dont believe in you astrologers, as we r two seperate and not of the same! Well, I am sorry to hurt some of you astronomers, but the truth is your wrong!! reasons being,is that Astonomy is the branch of natural science that studies the celestial bodies, The word is a combination of astron, greek for "star" & nomos, greek for "law
Astrology was formerly part of astronomy, with astological determinations being viewed as a practical application"of astronomical knowledge. Prior to modern period, all of the great astonomers were also astologers, like Tycho Brahe&Johanne

2007-07-13 22:03:30 · 9 answers · asked by aprilmacfadden 3 in Astronomy & Space

I have some strange rocks that I can't identify. I am hoping someone there can help identify them through pics I can e-mail.

2007-07-13 21:53:05 · 3 answers · asked by Anonymous in Earth Sciences & Geology

2007-07-13 21:52:17 · 13 answers · asked by frankie40216 1 in Mathematics

New theory that earth does not move round it self every day

s

Help new theory 10 proof for publish



that sun moves round some plates for day and night



earth round it self a year



---------------------------------------------------------------
New theory for all universities
I am very happy if I get any suggest from any where .if nay invite me

to proof my theory 10 proofs the other well in meeting next month:-
>The proofs that t earth not moves every day:>
>1- no any one can see movement off mountain from air plane the air port not close in spit off 10 hours



if it rain for along time in any where not change to other place or other city







- The earth only move in it axis Ayer to formed season I can proof how it happened 4 season I well explain this in meeting

>3-The 3 different shadow for body
>physics on shadow &size this in the afternoon why shadow is too short cercal ( is earth is running ???
>) All TV. photo are sowing [plants swimming in the sky>impossible happened any if the light moves



- Help poor Inventor for publish



-

Regard



- Mohamed alagbary

Yemen Taiz post 4729
>Notice I have 5 discovery on UK pat

2007-07-13 21:44:52 · 4 answers · asked by Mohammed A 1 in Earth Sciences & Geology

While I have some notion of what Entropy is qualitatively reading around, but I have no idea why dS = dQ / T exactly. Specifically why you divide by T. That is, why Entropy is exactly inversely proportional to temperature.

Is this just an arbitrary definition? or does it actually predict some some phenomenas. If so, what quantitative scientific observation does it predict?

2007-07-13 21:23:05 · 7 answers · asked by lainwired 1 in Physics

2007-07-13 21:19:56 · 8 answers · asked by ANNA S 1 in Mathematics

2007-07-13 21:07:30 · 7 answers · asked by Anonymous in Mathematics

How long will it take for the clocks to show the same time?

2007-07-13 21:04:50 · 18 answers · asked by mwanganyi v 1 in Mathematics

we have a project in Science and we have to find 6 latest inventions that can cure the ailments of circulatory and nervous system. I find it really difficult to search for the websites..

2007-07-13 21:02:25 · 2 answers · asked by Mia T 2 in Medicine

A triangle has the following properties:
1) It is scalene
2) It does not contain a right angle.
3) It has interger length sides
4) Its area is an integer.
Find the triangle with these properties which has the least perimeter.

[ Use Heron's Formula for the area of a triangle with sides a, b, c: where area = square root of s(s-a)(s-b)(s-c) where s is the semi perimeter (a+b+c)/2 ]

2007-07-13 20:49:16 · 3 answers · asked by Anonymous in Mathematics

2007-07-13 20:47:35 · 5 answers · asked by naser aawad 1 in Astronomy & Space

lets say the size of Manhattan. it stays in place but I guess it can move to. go I guess like huge boat island. moving slow.

2007-07-13 20:40:57 · 8 answers · asked by Anonymous in Physics

Keep in mind that I have to have something that will handle the ramp up voltage and I need an efficiency rate of 100%, not 90%.
I have tried inverters up to 1500 watts with 3000 watts peak voltage but they crap out just as the motor starts spinning. Does this mean that I will need a pure sine wave inverter? I have been using modified sine wave units so far. This shouldn't be that big of a deal, I am only trying to power a large,110 -125 volt motor.

2007-07-13 20:33:27 · 6 answers · asked by g4331 3 in Engineering

2007-07-13 20:29:51 · 8 answers · asked by ricky c 1 in Mathematics

2007-07-13 20:28:19 · 15 answers · asked by aurobindo r 1 in Astronomy & Space

A rectangular tank can be filled with water by 2 pipes in 100/9 minutes. If the larger pipe alone takes 5 mins less to fill the tank than the smaller pipe, find the time each pipe takes to fill the tank.

2007-07-13 20:16:55 · 5 answers · asked by o d 1 in Mathematics

2007-07-13 20:14:06 · 5 answers · asked by Anonymous in Astronomy & Space

I have heard earths magnectic field interchange every few thounsand years

2007-07-13 20:13:41 · 6 answers · asked by Anonymous in Astronomy & Space

2007-07-13 20:13:35 · 2 answers · asked by Edwin T 1 in Earth Sciences & Geology

2007-07-13 20:05:27 · 5 answers · asked by Anna P 1 in Astronomy & Space

i have a "feminine" voice. i've heard about surgical operations in the throat (i'm not sure) to alter the tone of the voice. is this possible?

2007-07-13 19:55:16 · 6 answers · asked by danj 1 in Medicine