Science & Mathematics - 19 November 2007

Ok, I'm doing a question that I am supposed to solve using the Quadratic Formula. I've already finished most of it, but am stuck at the last part. The equation is

21. 6x^2 + 7x + 2 = 0

I've gotten through most of the steps, and right now I'm at

x = -7 (plus/minus) the square root of 1, divided by 12.

Hard to write out the way it looks on paper, but I'll attempt.

.......-7 (+/-) 1 (sqrt)
x = ----------------------
...............12.............

Anyway, how do I go further? I don't understand what step is next. You can't simplify either -7 or 1, and I'm just confused. Maybe I did the whole thing wrong, but can anyone help?
Thanks so much!

2007-11-19 05:20:46 · 7 answers · asked by Anonymous in Mathematics

the end of a copper wire of diameter 0.30mm and length 1.50m is fused to one end of a steel wire of the same diameter and 1.20m in length. The wire is then hung vertically by attaching the free copper end to a fixed point and attaching a small weight to the lower end of the steel wire. The attachments reduce the length of each wire by 20mm. A load weight of 30N is then hung from the lower end of thesteel wire. Calculate
a) the stress in each wire,
b) the strain in each wire given that the Youngs modulas for steel is 2.0*10(power11)Nm(power-2) and for copper is 1.3*10(power11)Nm(power-2)
c) the total extension of the two wires

2007-11-19 05:16:55 · 1 answers · asked by Anonymous in Physics

2007-11-19 05:15:36 · 4 answers · asked by Anonymous in Weather

would a fruit grow a tree or plant striaght from the fruit if burried or must the seeds always be removed.

2007-11-19 05:07:10 · 6 answers · asked by Anonymous in Botany

(a) What is the minimum speed, relative to the Sun, necessary for a spacecraft to escape the solar system if it starts at the Earth's orbit?
(b) Voyager 1 achieved a maximum speed of 125,000 km/h on its way to photograph Jupiter. Beyond what distance from the Sun is this speed sufficient to escape the solar system?

2007-11-19 05:07:07 · 2 answers · asked by thisguyneedshelp121 1 in Physics

a 5.00 liter sample of gas measured at 27.0 Celsius & 1.25 atm of pressure has a mass of 10.13 g. What is the molecular weight of gas in u?

a. 2.50 x 10 ^-2

b. 0.898

c. 39.9

d. 2.57

2007-11-19 05:06:17 · 3 answers · asked by Katrina Green 2 in Chemistry

A satellite of the Earth has a mass of 104 kg and is at an altitude of 1.98 106 m. (Assume that U = 0 as r .)
(a) What is the potential energy of the satellite-Earth system?
(b) What is the magnitude of the gravitational force exerted by the Earth on the satellite?
(c) What force does the satellite exert on the Earth?

2007-11-19 05:06:08 · 2 answers · asked by thisguyneedshelp121 1 in Physics

It takes astronomical precision and a army just to launch a space craft from Earth.

How are we supposed to get back once we land there? It's a literal death sentence.

Does anyone else see this problem?

2007-11-19 05:05:13 · 14 answers · asked by Agent S 2 in Astronomy & Space

calculate the volume in gas in liters of of 3.50 moles of gas at STP.

a. 1.27

b. 0.721

c. 541

d. 1.08 x 10^3 torr.

2007-11-19 05:03:16 · 2 answers · asked by Katrina Green 2 in Chemistry

Show that on a roller coaster with a circular vertical loop, the difference in your apparent weight at the top of the loop and the bottom of the loop is 6 g's - that is, six times your weight. Ignore friction. Show also that as long as your speed is above the minimum needed, this answer doesn't depend on the size of the loop or how fast you got through it. Beginning height of the coaster is,h, and radius of loop is R.

2007-11-19 05:02:21 · 1 answers · asked by Jonathan Smith 1 in Physics

How much heat is required to raise the body temperature of a 60-kg woman from 21.9°C to 57.3°C?

2007-11-19 05:01:18 · 2 answers · asked by Anonymous in Physics

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if you see that sign, # , in a physics equation, what does it represent?

2007-11-19 04:56:05 · 2 answers · asked by Nick S 2 in Physics

about 0.6 per cent a year. Thus, if t is time in years since 1990, the population P, in millions, of Hungary can be approximated by P = 10.8(.994)^t
What does this model predict the population of Hungary will be in the year of 2000?
How fast (in people/year) does this model predict Hungary's population will be decreasing in the year 2000?

2007-11-19 04:53:52 · 2 answers · asked by simonkf2002 1 in Mathematics

what exactly happens in an out of body experience, and is it true that your linked to your body with a silver chord? how can you induce an out of body experience, if there is a way to induce it

2007-11-19 04:51:29 · 9 answers · asked by asdf 1 in Other - Alternative

Whats the difference in the way they are formed and the way they look?

2007-11-19 04:51:20 · 2 answers · asked by Anonymous in Earth Sciences & Geology

Anyone know?

2007-11-19 04:48:28 · 6 answers · asked by Anonymous in Mathematics

Natural gas is very abundant in many Middle Eastern oil fields. However, the costs of shipping the gas to markets in other parts of the world are high because it is necessary to liquefy the gas, which is mainly methane and thus had a boiling point at atmospheric pressure of -164 C. One opossible strategy is to oxidize the methane to methanol, which has a boiling point of 65 C and can therefore be shipped more readily. Suppose that 1.07 x 10^10 ft^3 of methane at atmospheric pressure and 25 C is oxidized to methanol.

2007-11-19 04:45:17 · 1 answers · asked by DLCJ 2 in Chemistry

2007-11-19 04:41:50 · 2 answers · asked by Anonymous in Engineering

2007-11-19 04:40:59 · 11 answers · asked by emily r 1 in Mathematics

2007-11-19 04:40:16 · 2 answers · asked by deva 6 in Earth Sciences & Geology

we are doing a lab in environmental science class and it looks gross. i think it might still be alive O_o

2007-11-19 04:39:57 · 11 answers · asked by babykhi16 2 in Biology

2007-11-19 04:39:02 · 3 answers · asked by deva 6 in Earth Sciences & Geology

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2007-11-19 04:37:17 · 10 answers · asked by Anonymous in Weather

2007-11-19 04:34:19 · 5 answers · asked by Anonymous in Geography

a) the integral from 2 to 5 of [(x-3)(3x+5)]dx

b) the integral from 0 to pi/3 of [(1/sin x)/(cos ^2x)]dx

c) the integral from pi/4 to pi/3 of [csc t(csc t-2cot t)]dt

d) the integral from ln 3 to 3ln3 of [e^x]dx

pleasee show as much work as possible for any of these i am veryy confused! thanksss!

2007-11-19 04:33:07 · 1 answers · asked by dee j 1 in Mathematics

so i'm making a solution of bromine in water and finding the concentration of this solution using a UV VIS spectrum and the beer-lambert law. What I'm wondering, is how do I know where to look on the graph to determine the concentration....mb this will be clear when I do the experiment, but I'm confused.
Can anyone help plzzzzzzz?

2007-11-19 04:32:18 · 1 answers · asked by Anonymous in Chemistry

what information cab be obtained by the neutral ferric chloride test ? Does this agree wiht the information obtained from IR spectrum of paracetamol?

2007-11-19 04:29:22 · 2 answers · asked by Shilpan Patel 1 in Chemistry