Science & Mathematics - 5 October 2006

2006-10-05 15:47:47 · 3 answers · asked by Uncle Gus 1 in Mathematics

I want to find the area under a curve described by parametric equations x = f(t) and y = g(t). I can show that the area is the integral of g(t)f'(t)dt (from t1 to t2), but does this work for a curve that fails the vertical line test? That is, can I use the formula to find the area of a circle desribed parametrically? (x=cost, y=sint) or some other function where x'(t) is not always positive? It doesn't always seem to work for me, but maybe I'm missing something.

2006-10-05 15:45:40 · 2 answers · asked by Anthony S 2 in Mathematics

2006-10-05 15:44:17 · 12 answers · asked by Anonymous in Mathematics

for an object to lose weight but at the same time not lose mass? explain.

2006-10-05 15:43:57 · 13 answers · asked by techline210 2 in Chemistry

2006-10-05 15:43:18 · 1 answers · asked by Anonymous in Chemistry

2006-10-05 15:40:06 · 5 answers · asked by Anonymous in Chemistry

2006-10-05 15:38:44 · 3 answers · asked by Anonymous in Chemistry

und us. true or false

2006-10-05 15:37:28 · 3 answers · asked by Anonymous in Chemistry

f(xy)=(x^3,y^(2.5)), find the directional derivative at (4, 5) in the direction theta = (2*pi)/3

2006-10-05 15:37:21 · 1 answers · asked by topgun553 1 in Mathematics

A 2-kg block sits on an incline where the top part of the incline has a coefficient of friction of kinetic friction of 0.70. The bottom section of the plane has kinetic friction of 0.95. THe angle of inclination is 40 degrees. The block is released and travels 10 m along the initial part of the incline and then enters the lower section. Calculate how far the block travels along the second section before it is brought to a stop.

I only want to know how to do it, because i don't know how to set it up. Please help me figure this out.

2006-10-05 15:34:53 · 2 answers · asked by Anonymous in Physics

to go technical career

2006-10-05 15:33:31 · 3 answers · asked by ferragy 1 in Engineering

2006-10-05 15:33:20 · 9 answers · asked by Kayla B 1 in Chemistry

2006-10-05 15:33:07 · 3 answers · asked by Anonymous in Mathematics

Do these kinds of musuems, say the liberty science center in new jersey for example, actually encourage kids to learn more about science, or even teach kids anything? Or are they just indoor amusement parks?

Do more traditional yet dry musueams do a better or worse job of getting kids interested in science?

2006-10-05 15:32:31 · 7 answers · asked by abcdefghijk 4 in Other - Science

If the problem is (x+7) - (-x-t) does it = x+7+x+t ??

2006-10-05 15:31:53 · 12 answers · asked by n4rumi 2 in Mathematics

I don't know how to simplify ratical expressions. Will someone please explain it to me.

2006-10-05 15:31:20 · 3 answers · asked by Steph 4 in Mathematics

Explain 'burning mirrors' concept of Archimedem's time.
Explain & demonstrate how this could have worked.

2006-10-05 15:30:54 · 4 answers · asked by zzangga 1 in Physics

I have this hwk design and i have no idea how to do it or where to start. This teacher is hella hard, help me out.
Here it is
http://www.ecst.csuchico.edu/~btseng/eece315/315des-2.pdf

2006-10-05 15:30:19 · 4 answers · asked by Anonymous in Engineering

this q relates to galaxy

2006-10-05 15:30:08 · 7 answers · asked by pankaj 1 in Earth Sciences & Geology

2006-10-05 15:29:08 · 7 answers · asked by Magge R 1 in Mathematics

Gallium at room temp is liquid Water expands when frozen.

If gallium is kept from expanding as it becomes solid at a real low temp what would happen?

2006-10-05 15:27:26 · 2 answers · asked by Buzz and Gang 2 in Physics

And if so, do you think they will like Jazz music and compete in Dino Shows (like Dogs shows ya know) ? Jurassic Park proved it, right? ANd I mention Jazz cause it's old like them. Do get me wrong, I'm not a scientist, but I know that DNA strands can be manipulated and revived if the correct sequence is attached.

2006-10-05 15:26:58 · 12 answers · asked by Anonymous in Zoology

We all know that you are supposed to get out of the water during thunderstorms. How far from a lightning strike is safe? For example, is everything killed within a 20' radius?

2006-10-05 15:26:29 · 1 answers · asked by Tikimodph 1 in Weather

I have heard of Slexa and Depakene(Depakote).....

2006-10-05 15:24:51 · 7 answers · asked by tom science 4 in Medicine

2006-10-05 15:24:07 · 2 answers · asked by llrounder 1 in Chemistry

Hello everybody
I was wondering how a plants roots can defy gravity, meaning disproving geotropism. Yes I know, there will be gravity pulling down the roots, but I need to find a way to make the roots defy gravity. My project ideas are to use a hydroponics set. First I would put a seed in a plastic clear container filled with water. In the middle of the container would be mesh to prevent the seed from falling to the bottom and allowing the roots to grow through the mesh. As the roots have grown a little bit, I plan to take the seed and its roots, and suspend its roots with some string and a trellis. The seed would be facing to the bottom of the container. Would this idea disprove geotropism? Your comments, remarks, retorts, and suggestions are much appreciated! =D

2006-10-05 15:23:03 · 3 answers · asked by wongtongsoup22 2 in Botany

What is like the best medicine for scars or pimples to go away so that skin can be nice??? without having skin pealing and all that stuff....

2006-10-05 15:22:50 · 7 answers · asked by xxslatkamala89xx 1 in Medicine

I am trying to understand this example my book gives of partial derivatives of functions with more than two variables.

(please note, I'm using extra parantheses for clarity)

If f(x,y,z) = (x^3)(y^2)(z^4) + 2xy + z then

1. (df/dx) = 3(x^2)(y^2)(z^4)+ 2y
2. (df/dy)= 2(x^3)y(z^4) + 2x
3. (df/dz) = 4(x^3)(y^2)(z^3) + 1

My questions:

In #1, what happened to the last z term?

In #2, again, what happened to the last z-term?

In #3, what happened to the 2xy?

It appears that I don't know some particular rule about partial derivatives, so I don't understand why these derivatives are the way they are.

Thank you SO MUCH!

2006-10-05 15:20:17 · 4 answers · asked by 99 ways to smile 4 in Mathematics

2006-10-05 15:18:47 · 4 answers · asked by Anonymous in Astronomy & Space

2006-10-05 15:17:03 · 1 answers · asked by kia p 1 in Biology