Science & Mathematics - 17 December 2007

I'm only in eighth grade so please explain it in an easy method to follow. Please attempt to answer the following questions:

1. When and Where is Phi used??
2. What is the difference between 1.618 and 0.618?? When is each used??
3. Please give some examples on how to use phi.

Any additional information is appreciated. Thank you.

2007-12-17 07:49:52 · 2 answers · asked by α ρℓα¢є ¢αℓℓє∂ мєℓαи¢нσℓу . 6 in Mathematics

2007-12-17 07:49:24 · 3 answers · asked by Cookie A 1 in Physics

i need help, I don't know how to solve this problem:

y = (3x-4)squared

I need to find the derivative using the Product Rule. Can someone show me the work how to do it, I don't need the answer only.

2007-12-17 07:47:47 · 10 answers · asked by Anonymous in Mathematics

2007-12-17 07:47:28 · 5 answers · asked by Cookie A 1 in Mathematics

What is the largest number correct to 2 decimal places that comes before 5.5 and why? Please help

2007-12-17 07:45:43 · 4 answers · asked by Anonymous in Mathematics

2007-12-17 07:45:38 · 1 answers · asked by Anonymous in Mathematics

2007-12-17 07:42:03 · 2 answers · asked by Anonymous in Mathematics

I'm revising for a chamistry test but what is the mole of a subtance, what is it used for, and how do I work it out?

2007-12-17 07:40:26 · 14 answers · asked by Anonymous in Chemistry

after coming down a hill with a 35 degree slope, the sled with a mass of 35 kg, coasts up a long hill with a 30 degree slope that has a coefficent of friction of 0.083. How far up the second hill does the sledder go?

2007-12-17 07:36:35 · 2 answers · asked by Anonymous in Physics

d

2007-12-17 07:35:38 · 7 answers · asked by Anonymous in Mathematics

How fast would a car be going if it travelled 45miles in 26minutes 44seconds?

2007-12-17 07:33:13 · 1 answers · asked by telly1989 2 in Physics

Grading System:
65% Tests
25% Quizzes
10% Homework
Quiz 60
Quiz 90
Quiz 100
Test 30
I only missed one homework assignment. But I don't know the grade.
My grade with those is 44.8.
Since then my teacher highered my test score to a 40.
And I got a 84 in a new quiz.
What is my grade now AND what grades do I have to get to get a 80 for the marking period if I have 3 tests and 3 quizzes to take before the end of the marking period?
Thank you so much for anyone who answers.

2007-12-17 07:30:30 · 4 answers · asked by In hiding 4 in Mathematics

2007-12-17 07:28:55 · 16 answers · asked by dodgerfan_two 1 in Astronomy & Space

My friend and I are going to do a physics project. We are making a big sling shot and using math to find out where it hits the ground. We have a scale in which will convert to how much force this sling shot will shoot with, but we dont know how to figure out the distance and all. How do you go about doing this?

2007-12-17 07:25:32 · 2 answers · asked by Anonymous in Physics

2007-12-17 07:23:19 · 4 answers · asked by Anonymous in Chemistry

Every explanation/illustration describes them as 'holes' in spacetime, usually the familiar funnel shape. Images of trampolines with bowling balls to describe gravity seem to be a common starting point.
But since space is not a flat plane, is it therefore a 'hole' from every angle?

A collapsed star would collapse inward, and so it seems that the proper illustration of a black hole would look similar to a 3D representation of a tesseract - only spherical - rather than a funnel coming to an infinitely dense point.

Sorry if this question is missing or misusing technical terminology.

2007-12-17 07:23:18 · 2 answers · asked by Spencer H 1 in Physics

2007-12-17 07:16:38 · 2 answers · asked by Anonymous in Mathematics

A chess board 8x8 is placed on top of an identical board and rotated through 45 degrees about its center.

What is the area S which is black in both boards?

2007-12-17 07:15:20 · 2 answers · asked by Anonymous in Mathematics

2007-12-17 07:14:08 · 6 answers · asked by Anonymous in Chemistry

How doea it work in industrial fied, motors, controls, 3ph systems.

2007-12-17 07:12:42 · 4 answers · asked by David B 1 in Engineering

2007-12-17 07:12:08 · 2 answers · asked by badboyzpet 1 in Chemistry

Ok, so i'm doing a little project with my younger brother and i need to know will a 1.5v (AA) battery destroy two LED's, which each have a maximum forward voltage of 2.5v and a maximum forward current of 40ma, when wired in a series circuit along with a 1.5 volt moter.

would this work, would there be too much or not enough power?

Thanks.

2007-12-17 07:06:10 · 4 answers · asked by Rover 3 in Engineering

i need help balancing this chemical equation

C3H8+O2----> CO2+H2O

2007-12-17 07:02:13 · 2 answers · asked by Anonymous in Chemistry

a box is being pushed across an elevator floor.
the pushing force is 3.14 N
the elevator is accelerating upwards at 0.55 m/s^2
what is the coefficent of kinetic friction?

much appreciated <3

2007-12-17 06:59:10 · 2 answers · asked by Anonymous in Physics

2007-12-17 06:58:37 · 5 answers · asked by martinanderson23 1 in Engineering

1/R=1/r1+1/r2 solve for r2

r1=r to the first power.. and the little r and R and different.

2007-12-17 06:58:37 · 9 answers · asked by Anonymous in Mathematics

As our school project, my friends and i are preparing acetanilide. Could you tell me if we have to take some extra precaution with the product or if it's absolutely safe ?

2007-12-17 06:58:24 · 4 answers · asked by w4c~m3-5un 3 in Chemistry

2007-12-17 06:57:20 · 4 answers · asked by martinanderson23 1 in Engineering

why is it necessary to let the evaporating dish cool before measuring the mass.
why should the mass of the evaporating dish be measured immediately after it cools, and not later?
thanks=)

2007-12-17 06:44:55 · 1 answers · asked by Anonymous in Chemistry

eg: y = 4a(x^2+b) over 3
multiply by 3 - 'why is this 1st'?
divide by 4a - 'why divide? how do you know to divide'?
many thanks

2007-12-17 06:42:35 · 2 answers · asked by Anonymous in Mathematics