Science & Mathematics - 10 September 2007

2007-09-10 16:31:44 · 8 answers · asked by Anonymous in Zoology

What would fly better? Paper or foil?
What kind of design? Like a more pointed tip? More folds? And why?

Please help :D

2007-09-10 16:28:16 · 2 answers · asked by Love. 6 in Other - Science

The method of preparation for an aqueous solution calls for 5.0 grams of anhyrdrous sodium sulfate, Na2SO4. The sodium sulfate available is crystalline hydrated sodium sulfate, NaSO4 * 10 H2O. How many grams of this hydrated compound should be used in place of the anhydrous compound when preparing the reagent? FW of Na2SO4 is 119.05 g/FW, MW of water is 18.02 g/mol. Hint: the number of moles of crystalline hydrated sodium sulfate must equal the number of moles of anhydrous sodium sulfate

2007-09-10 16:27:26 · 1 answers · asked by Jon P 1 in Chemistry

How do you convert 750 picograms into grams?

2007-09-10 16:27:12 · 4 answers · asked by Diamond 3 in Mathematics

can some one please explain the steps in figuring these type of math problems

2007-09-10 16:25:19 · 11 answers · asked by michelle r 1 in Mathematics

A polynomial p(x) . Given that p(x)>0 for all x>a, a is real number.
PROVE - if p(-x) = q(y) then q(y) <0 for all y < -a

2007-09-10 16:24:35 · 1 answers · asked by Falcon Feather 2 in Mathematics

THIS UNIVERSE IS MADE UP FROM 5 ELEMENTS AND WE (LIVING BEINGS) ARE SOULS , BUT LIVING LIKE A PHYSICAL BODY . I HOPE YOU WILL GET YOUR ANSWER TO MY QUESTION AT : www.sahib-bandgi.org

2007-09-10 16:24:10 · 9 answers · asked by nitin m 1 in Astronomy & Space

choose a variable to represent the unknown number and write the correct equation
"The sum of two times a number and ten is equal to forty-four"

2007-09-10 16:19:27 · 3 answers · asked by Anonymous in Mathematics

I need to take coal with a calorific value of 12,880 btu/lb and figure out how much it would cost to obtain 1 million BTUs.....any help or equation..ANYTHING would be great thanks

2007-09-10 16:18:34 · 3 answers · asked by Tommy f 1 in Engineering

Physics Problem Trouble?
A seagull, ascending straight upward at 4.40 m/s, drops a shell when it is 15.5 m above the ground.

The magnitude and direction of the shell's acceleration just after it is released is 9.8 m/s^2 downward.

The maximum height above the ground reached by the shell is 16. 487755 m.

A. How long does it take for the shell to reach the ground?

B. What is the speed of the shell at this time?

HELP I am totally at a loss! I got that the max height is 16.487755, but I can't figure out the next two parts.

2007-09-10 16:18:26 · 4 answers · asked by lstntht 1 in Physics

In the movie Matrix, when a flying bullet is shown in slow motion, it emits some kind of rings behind it. Does a it really do that in real life, if the bullet is seen in slow motion, or is that just an “imaginary” effect for movies only? (And if it is real, then what makes it do that?)

Also this is a random question, but do you have any idea why this special effect (for the movie) is named as “bullet time?” I was just curious if anyone knew.

2007-09-10 16:16:32 · 3 answers · asked by ? 1 in Physics

A basketball player, standing near the basket to grab a rebound, jumps 76.0 cm vertically. How much total time does the player spend (a) in the top 15.0 cm of this jump and (b) in the bottom 15.0 cm? Does this help explain why such players seem to hang in the air at the tops of their jumps? Show and explain your work. Thanks and good luck! :)

2007-09-10 16:15:23 · 1 answers · asked by Anonymous in Physics

(2.3 x 10^4) + (2.0 x 10^-3)=
I know that i must make the exponents the same,but i don't know if i'm doing it right.
please tell me how to do it (by hand plz)

also is this right?
(2.67 x 10^-3) - (9.5 x 10^-4)

2007-09-10 16:11:59 · 1 answers · asked by Anonymous in Physics

OK, so here's the question: The expression 2(l+w) can be used to find the perimeter of a rectangle with a length l and width w. What are the length and width of a rectangle if the area is 13.5 square units and the length of one side is 1/5 the measure of the perimeter? Explain your reasoning.
I figured out the answer. I figured out that if two sides must be 1/5 of perimeter each and two sides must be 1.5/5 of perimeter. So I figured out that the sides must be 3,3,4.5,4.5 units each to equal a perimeter of 15. However, I just figured this out by plugging in numbers until all factors were met. I know there must be a formula to figure out this answer and I need to show my daughter that. Please help this 30+ year old who has forgotten her math knowledge! I need help with the "explain your reasoning" part. Thanks!

2007-09-10 16:11:31 · 12 answers · asked by JM 2 in Mathematics

2007-09-10 16:11:12 · 8 answers · asked by Lisa A 1 in Zoology

hi im having trouble with integers and dont know how to do any question with them involved so do you subtract and add integers??
eg. positive5+negative8=???
and negative 5 - negative 3
and negative 7-positive 2

2007-09-10 16:09:20 · 5 answers · asked by Watching it all fall. 4 in Mathematics

I mean are there characteristic's of humans that have changed over recent times that are observable?

2007-09-10 16:09:02 · 8 answers · asked by Anonymous in Biology

Interview will be done through face-to-face,email or telephone. I am doing an assignment on benefit of kissing, (or may be disadvantages of it too), from health perspectives as well as psychological. Thank you!

2007-09-10 16:06:37 · 2 answers · asked by yuyu 1 in Medicine

2007-09-10 16:06:16 · 11 answers · asked by akopyan123 1 in Mathematics

Isn't the universe supposed to be everything?

2007-09-10 15:56:21 · 12 answers · asked by zingis 6 in Astronomy & Space

Doing a research paper and I need to know why lab animals are usually white or light colored. I dont want to hypothesize as to sound ignorant, so I wont guess. Any input is appreciated. Thanks

2007-09-10 15:55:08 · 11 answers · asked by fck_the_yankees 3 in Zoology

2007-09-10 15:48:25 · 2 answers · asked by skulltra_02 1 in Physics

How do i simplify these equations?

1.x/12x^2

2. 2x+6/x^2 - 9

3. 3 x square root of 7 + 4 x square root of 7

4. 9 x square root of 2 - 12 x square root of 8

2007-09-10 15:45:56 · 3 answers · asked by stephen s 1 in Mathematics

I would like to explain why rainbows appear in a bow shape to a primary school aged child.

2007-09-10 15:45:55 · 11 answers · asked by Lilly 2 in Weather

They could make it out of anything and it could be at least as beautiful as the metallic shine. When cars bump and scrape each other, instead of replacing a panel, there would just be a bruise or wound that could be repaired for much less. The current design is so inefficient, and people hit by cars would have a better chance of less injury.

2007-09-10 15:42:06 · 7 answers · asked by veddy no veddy veddy yes 2 in Engineering

2007-09-10 15:41:17 · 4 answers · asked by Care-bear 1 in Engineering

Why Marcello Truzzi("the skeptic's skeptic.") leave or detach himself from CSICOP?

2007-09-10 15:39:34 · 9 answers · asked by kokopelli 6 in Paranormal Phenomena

I don't quite understand it like the five other ones i had, so does anyone like mind explaining it to me. I'm not saying just give me the answer and leave like other YA stupid a$$es, i want an explanation if you feel like adding it:

(9lxl + 3) - 5 lxl -3= 12

2007-09-10 15:37:27 · 4 answers · asked by |♥*/♥\*♥| 3 in Mathematics

please explain how to solve:

100! / 98!2!

(100! Divided by 98! times 2!)

Please show any work, thanks :)

First answer = 10 points.

2007-09-10 15:35:33 · 2 answers · asked by Anonymous in Mathematics

Derek C, I appreciate the help.
Does your answer consider the possibility of three consecutive positive integers? Four?
Thanks so much

2007-09-10 15:35:28 · 2 answers · asked by Anonymous in Mathematics