Science & Mathematics - 1 November 2007

2007-11-01 15:20:15 · 4 answers · asked by Aljiray F 1 in Earth Sciences & Geology

2007-11-01 15:18:31 · 5 answers · asked by Anonymous in Zoology

All of you skeptics about ghosts/demons and all of that supernatural stuff, why are you a skeptic? What would make you believe in them?

2007-11-01 15:17:51 · 10 answers · asked by Anonymous in Paranormal Phenomena

If f(x) = 4x - 6, what is f(-3)?

6
-49
-18
-6


If f(x) = 2x and g(x) = x-4, what is the value of f[g(3)]?

-6
-2
0
6
2






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If f(x) = 2x + 3 and g(x) = (x - 3)/2, what is the value of f[g(-5)]?

-4
-10
-7
-5



If f(x) = 5x - 7, what is f -1(x)?

f -1(x)= (x+7)/5
f -1(x)=(y-7)/5
f -1(x)=5x - 7
f -1(x)=7x-5

2007-11-01 15:17:46 · 6 answers · asked by Sam o 1 in Mathematics

A particular river follows the quadratic curve f(x)=x^2, while a nearby road follow cubic curve g(x)=ax^3+bx^2+cx+d.

There are three bridges on the road and they cross the river at the points (1,1), (0,0) and (1,1). The bridge at (1,1) is at right angles to the river. A dam is located at (1,2). The dam is not on this river. There is a straight spillway from the dam to the nearest point on the river.

a) What are the values of a,b,c,d?

b) What are the distances between teh bridges, as the crow flies?

c) At what angles (give both radians and degrees) do the other two bridges cross the river?

d) Where does teh spillway from the dam intersect the river?

e) A straight road is to be built from the existing road to the dam. Where on the original road should it start to have minimum length?



To anyone who could solve a part or all of this....thank you so much!!

2007-11-01 15:17:07 · 2 answers · asked by wintericefairy 1 in Mathematics

A hollow spherical shell is rolling without slipping or sliding down a board that is tilted at an angle of 34.0° with respect to the horizontal. What is its acceleration?

2007-11-01 15:14:52 · 1 answers · asked by Anonymous in Physics

Consider two gases, A and B, each in a 1 L container of same temperature and pressure. The mass of container A is .34 and B is .48.

a) Which gas sample has the most molecules?
b) Which gas sample has the largest average kinetic energy?
c) Which sample has fastest average velocity?
d) How can the pressure in the 2 containers be equal since gas B molecules collide with the container more frequently?

2007-11-01 15:14:02 · 1 answers · asked by Anonymous in Chemistry

I spilled some potassium dichromate solution (about 0.02 M; the stain's a little larger than a quarter) on my jeans. I know it's pretty toxic; are there any special precautions I should take to wash it? Can it just go in the washing machine, or should I try to get the stain out and dispose of it with lab hazmat (and if so, what should I use to wash it out?)

2007-11-01 15:11:16 · 1 answers · asked by Kat 2 in Chemistry

Suppose that X is random variable with a mean of 5 and a variance of 9. If y = 2x^2 + 4, find the mean of Y.

I used the equation variance = e(x^2) - [e(x)]^2

9 = mean(y) - 5^2,
34 = mean(y)

The answer in the book is 72. Can somebody help me?

2007-11-01 15:07:47 · 1 answers · asked by peopledude123 1 in Mathematics

........CH3
............I
CH2=C-CH2CH2CH3

2007-11-01 15:02:59 · 2 answers · asked by Jenn S 2 in Chemistry

I love that show!

2007-11-01 15:01:58 · 13 answers · asked by Anonymous in Paranormal Phenomena

Pseudoscience is often confused with real, valid, quantifiable science. What is pseudoscience and how can you tell pseudoscience from real science? What is the purpose of pseudoscience and with what pseudosciences are you familiar?

2007-11-01 15:01:32 · 3 answers · asked by HEY 1 in Botany

It is a storage bin. Find the dimension of the largest open-top storage bin with a square base and vertical sides that can be made from 108 ft^2 of sheet steel. It may neglect the thickness of the steel and assume that there is no waste.
This is a calculus problem.

2007-11-01 15:00:35 · 4 answers · asked by Anonymous in Mathematics

2007-11-01 14:58:20 · 1 answers · asked by Anonymous in Chemistry

2007-11-01 14:57:46 · 8 answers · asked by theall6 1 in Paranormal Phenomena

a)endergonic
b)exothermic
c)endothermic
d)spontaneou
e)enthalpic

2007-11-01 14:56:51 · 1 answers · asked by Christina S 1 in Chemistry

A 2.5 -kg block slides down a 25 degree inclined plane with constant acceleration. The block starts from rest at the top. At the bottom, its velocity reaches .65 m/s the lenght of the incline is 1.6m.

what is the coefficent of friction between the plane and the book?

2007-11-01 14:56:38 · 1 answers · asked by james 2 in Physics

Find the intervals on which the function is increasing, decreasing, concave up, concave down, then find any local extreme values, and inflection point and explain.
y=-x^5+(7/3)x^3+5x^2+4x+2
This is a calculus problem.

2007-11-01 14:53:46 · 1 answers · asked by Anonymous in Mathematics

xy' + (1-x)y = e^(2x) / x

and also y' + ytanx = 0

2007-11-01 14:51:51 · 1 answers · asked by mmm 2 in Mathematics

I am currently working with Synthesis Reaction, Decomposition Reaction, Single-Replacement Reaction, Double-Replacement Reaction and Combustion Reaction. I am given a few problems and told to do them, but I do not understand them, here is my first one

MagnesiumBromide + Chlorine ------>

Now I do understand balancing after you get the entire equation, but what I don't understand is how to balance the above, get the second side of it and figure out witch of the above 5 types I gave it will turn into. If anyone has either a really detailed site explaining how to do this then I would love that or if someone would like to show me how to go through this problem, then that would be awesome as well. Ill go ahead and give one more in case someone decides to show me how to do this and I would be pleased with a second walk through as well with this one.

Aluminum + Iron(III)Oxide ----->

Please and thank you all!!

2007-11-01 14:51:31 · 4 answers · asked by Anonymous in Chemistry

gfc of 105, 168, 224
using prime factorization

plz help thx

2007-11-01 14:48:55 · 7 answers · asked by jacqueline m 1 in Mathematics

Can anyone tell me what Baryonic matter is and Baryonic dark matter is

2007-11-01 14:48:15 · 1 answers · asked by tjakk 1 in Physics

The diffraction pattern from a single slit is viewed on a screen. Using blue light, the width of the central maximum is 2 cm

(b) If the blue light has wavelength 0.39 m and the red light has wavelength 0.8 m, what is the width of the central maximum when red light is used?

2007-11-01 14:47:32 · 1 answers · asked by Anonymous in Physics

how do limiting factors affect populations?

2007-11-01 14:47:19 · 2 answers · asked by A girl 2 in Biology

Like i mean that like why is it out during the day that makes no since

2007-11-01 14:47:14 · 9 answers · asked by abby e 1 in Astronomy & Space

The central bright fringe in a single slit diffraction pattern from light of wavelength 516 nm is 2.3 cm wide on a screen that is 1.05 m from the slit.

(a) How wide is the slit?

(b) How wide are the first two bright fringes on either side of the central bright fringe? (Define the width of a bright fringe as the linear distance from minimum to minimum.)

2007-11-01 14:46:22 · 1 answers · asked by Anonymous in Physics

Given a set of data
example: x = [a b c d e f] & y = [g h i j k l]
a question reads: find the most accurate approximation of dy/dx evaluated at x = a or b or c or d or e or f
how do you know to use the backwards or forwards differentiation formula. ( I think it has to do with where your asked to take the derivative) Please help!

2007-11-01 14:45:34 · 1 answers · asked by Anonymous in Mathematics

2007-11-01 14:45:08 · 16 answers · asked by jaburt22@sbcglobal.net 1 in Mathematics

a-75,99
b-76,85
c-56,91
d-57,132

which is relatively prime plllllz thx

2007-11-01 14:44:51 · 3 answers · asked by Anonymous in Mathematics

Does maps of underground lavaflows exist?
If so - can I find them online?
I´m mostly interested in flows in and around Mexico.

2007-11-01 14:43:48 · 1 answers · asked by Anonymous in Earth Sciences & Geology