Science & Mathematics - 26 November 2007

2007-11-26 12:42:15 · 2 answers · asked by drain_bamaged 2 in Chemistry

If water becomes water vapor at 100 degrees C, and is liquid water at any lower temperature, than how does water vapor stay as water vapor when it's at room temperature, wouldn't it be constantly condensing? Does this make any sense?

2007-11-26 12:41:16 · 4 answers · asked by Hector 2 in Chemistry

I need to build a toothpick bridge for physics. Which should I use?

2007-11-26 12:38:55 · 1 answers · asked by lehdownthebeat3 1 in Physics

This is a webassign question. I did all the rest but can't figure this one out.
Here it goes:
A student stands on a bathroom scale in an elevator at rest on the 64th floor of a building. The scale reads 847 N.

(a) As the elevator moves up, the scale reading increases to 952 N, then decreases back to 847 N. Find the acceleration of the elevator (m/s/s).

(b) As the elevator approaches the 74th floor, the scale reading drops to 782 N. What is the acceleration of the elevator?
m/s2
(c) Using your results from parts a and b, explain which change in velocity, starting or stopping, would take the longer time.
stopping
starting

(d) What changes would you expect in the scale readings on the ride back down?

2007-11-26 12:38:23 · 2 answers · asked by Iris S 2 in Physics

2007-11-26 12:38:17 · 15 answers · asked by holstein3 2 in Mathematics

2007-11-26 12:37:32 · 4 answers · asked by christy z 1 in Chemistry

2007-11-26 12:35:24 · 2 answers · asked by Anonymous in Biology

This is not a homework question. i am merely posting this on here in hopes that you guys can settle a bet between a friend of mine.

2007-11-26 12:35:23 · 1 answers · asked by KEVIN 3 in Physics

what chemical equation defining the reaction between magnesium and hydrochloric acid. Including the products and the gas it makes

2007-11-26 12:35:21 · 3 answers · asked by Anonymous in Chemistry

If your textbook is in equilibrium, what can you say about the forces acting on it?

2007-11-26 12:34:42 · 1 answers · asked by Anonymous in Physics

2007-11-26 12:33:59 · 1 answers · asked by Anonymous in Biology

What is multiplicative inverse of 3/4?
a) -1
b) 4/3
c) -4/3
d) -3/4

2007-11-26 12:33:37 · 1 answers · asked by oppa 2 in Mathematics

How do we make a simple circuit using these items???
My daughter is doing a science project. She has painted a shoe box black, and has a photo cell inside the box with the wire ends ot the photo cell extending outside the box. She has a divider running half way down the middle of the box. At the end she has a stand to place a ball on. She has painted several different colored balls, and will place them on the stand, and wants to see the different readings using a volt meter using a potentiometer. She has a hole in one end where she will use a flash light to see how it relects/volt meter reads off the colored balls.
We are having lots of problems trying to help her hook up this simple circuit. I thanks you in advance for your input!

2007-11-26 12:33:33 · 4 answers · asked by Candee Graham 3 in Engineering

I know this is not a very hard physics problem but I'm having some trouble figuring out the answer. Does anyone know how to do this?

2007-11-26 12:31:18 · 2 answers · asked by Sean 2 in Physics

Use slopes and the distance formula to show that the quadrilateral whose vertices are (0, 0), (1, 3), (4, 2) and (3, -1) is a square.

2007-11-26 12:30:52 · 2 answers · asked by journey 1 in Mathematics

My number is a multiple of 150. 9 is a factor of my number. My number has 3 digits. The sum of the digits in my number is 9 ?

2007-11-26 12:30:30 · 6 answers · asked by Anonymous in Mathematics

genetics of dominant allele & recessive allele

2007-11-26 12:28:05 · 5 answers · asked by Melba G 1 in Other - Science

I know how to find the element... but I'm confused as to how you find the EC of a compound. Do you add them together? Add the electrons first?

Our teacher sent us home to do this without explaining how and we're all lost! So on behalf of about 15 students, thanks!

2007-11-26 12:27:58 · 3 answers · asked by ChaChaChingThing 2 in Chemistry

The equations of two lines are given. Determine if the lines are parallel, perpendicular or neither.

(1) y = (1/2)x - 3 and y = -2x + 4

(2) y = -2x + 3 and y = (-1/2)x + 2

2007-11-26 12:26:11 · 3 answers · asked by journey 1 in Mathematics

In the movie Jurassic Park, there is a scene in which some members of the visiting group are trapped in the kitchen with dinosaurs outside. The paleontologist is pressing against the center of the door, trying to keep out the dinosaurs on the other side. The botanist throws herself against the door at the edge near the hinge. A pivotal point in the film is that she cannot reach a gun on the floor because she is trying to hold the door closed. If the paleontologist is pressing at the center of the door, and the botanist is pressing at the edge about 6 cm from the hinge, estimate how far the paleontologist would have to relocate in order to have a greater effect on keeping the door closed than both of them pushing together have in their original positions.

2007-11-26 12:26:07 · 2 answers · asked by ? 1 in Physics

2007-11-26 12:23:11 · 2 answers · asked by Kenji Peterpan 1 in Earth Sciences & Geology

How many chromosomes does EACH new nucleus have compared to the number of chromosomes contained by the original cell in prophase1 !!! please answer !!!

2007-11-26 12:20:23 · 1 answers · asked by asad a 1 in Biology

How do i find:
the number of protons, neutrons, electrons and the charge of the element

thanks!!

2007-11-26 12:20:15 · 1 answers · asked by JulyFire 5 in Chemistry

2007-11-26 12:19:05 · 1 answers · asked by Anonymous in Chemistry

Some enterprising physics students working on a catapult decide to have a water balloon fight in the school hallway. The ceiling is 3 m in height, and the balloons are launched at a velocity of 10 m/s. the acceleration of gravity is 9.8 m/s/s.
At what angle must they be launched to just graze the ceiling? Answer in units of degrees.

2007-11-26 12:15:31 · 2 answers · asked by Anonymous in Physics

Pretend you are a travel agent working in Middle Earth. Try to bring as many creatures as possible to visit certain parts of Middle Earth.
Describe any 2 of the following places with information and tourist in formation. Try to welcome tourists.
Rivendell
Lonely Mountain
Hobbiton/The Shire
Goblin Caves
Long Lake/Esgaroth
Edge of the Forest
Mirkwood

Thanks
I appreciate it

2007-11-26 12:12:30 · 2 answers · asked by Brandon 1 in Earth Sciences & Geology

I lost one of the books that has plants AND animals in them and these particular questions have to do with plants AND of course animals so here ya go:




1) What is pollination?!




2) Do we eat grass?!




3) What is the "food chain" and what is the role of plants in it?!




4) What is the relationship between food and energy for our bodies?!

2007-11-26 12:09:56 · 1 answers · asked by Retroness_is_love@hotmail.com 1 in Botany

If there are 600 boys and 400 girls in a school, and 3 of them are randomly waiting at the bus stop, what is the probability that all three are girls or all three are boys?

2007-11-26 12:08:26 · 2 answers · asked by mr. cheeze 3 in Mathematics

How can there be 2000 minerals when there are only 88 naturally occuring elements?

2007-11-26 12:08:10 · 5 answers · asked by Jeanette50 1 in Earth Sciences & Geology

x^9+512

I got it down to (x+2)(x^2-2x+4)(x^6-8x^3+64)...Is this completely factored? Or is it still factorable?

2007-11-26 12:06:56 · 4 answers · asked by Jae 3 in Mathematics