Science & Mathematics - 2 December 2007

thnaks

2007-12-02 15:42:44 · 2 answers · asked by vote4pedro41 1 in Mathematics

I have answers so I would really like help with the actual work to figure it out! Thanks!

A small crack occurs at the base of a 15.0 m high dam. The effective crack area through which water leaves is 1.30 x 10^-3 m^2. Ignoring viscous losses, what is the speed of water flowing through the crack? (Chapter 10)
a. 14.0 m/s

2007-12-02 15:41:24 · 1 answers · asked by PinkyTrauma 2 in Physics

just in simple numbered steps....how do you find it...i have an idea but am still very foggy. thanks a bunch!

2007-12-02 15:38:46 · 3 answers · asked by Shan 1 in Earth Sciences & Geology

I have listened to people talk about seeing ghosts on TV shows, and full body appartions, etc. like they are as common as cornstalks in a corn field.
Now I assume that ghosts are being formed continuously, since millions of people die weekly, some in horrible agony, etc.
There are millions of camcorders, webcams, digital cameras, and more and more people. The only videos and photos I have seen are obvious fakes, or you have to have a very vivid imagination.
Why isn't there any good video or photos of ghosts? I mean with millions and millions of ghosts walking around and millions of cameras all over the world, why aren't they caught on video?
I mean even the ghosthunter guys who go to the most "haunted" places never get any believable footage of anything that might be a ghost.
Why don't ghost hunting organizations set up webcams where all these apparitions walk around? Or do they?
So where are the ghosts?

2007-12-02 15:38:38 · 22 answers · asked by madcat 5 in Paranormal Phenomena

2007-12-02 15:38:02 · 2 answers · asked by Anonymous in Botany

Does it?

2007-12-02 15:37:01 · 5 answers · asked by Anonymous in Earth Sciences & Geology

I need help working these problems out... BUT I have answers so showing me the work would be great!

Many hot water heating systems have a reservoir tank connected directly to the pipeline, so as to allow for expansion when the water becomes hot. The heating system of a house has 76 m of copper wire whose inside radius is 9.5 x 10^-3 m. When the water and pipe are heated from 24 to 78 degrees C, what must be the minimum volume of the reservoir tank to hold the overflow of water? (Chapter 13)

2007-12-02 15:33:17 · 1 answers · asked by PinkyTrauma 2 in Physics

TRUE OR FALSE:
1. The maximum height for any projectile occurs at 2/3 of the total time.
2. The time it takes for an object that is dropped from a train window to fall to the ground is dependent upon the speed of the train.

2007-12-02 15:30:09 · 1 answers · asked by Khadedra C 1 in Physics

2007-12-02 15:29:02 · 3 answers · asked by David L 1 in Zoology

When you an engineer dont you invent stuff all the time or what? What do they do during a typical day.

2007-12-02 15:28:17 · 19 answers · asked by shhhhhhhhhhhhhh12344 1 in Engineering

A monkey sat in front of a special typewriter that only contained keys for the letters A, L, G, O, R, I, T, H, M, S. The monkey sat at the typewriter for a long time and pressed the keys. At the end of this time, the pattern typed on the page was quite remarkable. In fact, the monkey had typed out a large number of 10 letter words, all different mis-spellings of the word ALGORITHMS, one after another. Moreover, each mis-spelling had all of all the letters A, L, G, O, R, I, T, H, M, S and every letter was in the wrong position. If the monkey had typed every mis-spelling of this type exactly once, and had typed nothing other than these mis-spellings, how many times was the letter A typed in total?

2007-12-02 15:28:07 · 4 answers · asked by Mugen is Strong 7 in Mathematics

tan((sin^-1)x)

2007-12-02 15:27:21 · 1 answers · asked by Jay j 1 in Mathematics

1. A designer, attempting to arrange the characters of his artwork in the form of a square grid with equal number of rows and columns, found that 24 characters were left out. When he tried to add one more row and column, he found that he was short of 25 characters. Can you find the number of characters used by the designer?

2. Some students planned for a get-together. The budget for food was $500. Five of the students failed to come because of the distance and therefore the cost of food for each member increased by $5. How many students attended the get-together?

3. Rita rows 12 km upstream and 12 km downstream in 3 hours. The speed of her boat in still water is 9 km/hr. Find the speed of the stream.

2007-12-02 15:26:02 · 1 answers · asked by Anonymous in Mathematics

1. A nickel rolls at a constant velocity across a tabletop 1.05m high. It rolls off the side of the table and hits the floor 0.0375m away. How fast was the nickel rolling initially? Please include work

2007-12-02 15:24:16 · 1 answers · asked by Khadedra C 1 in Physics

1) Find the rate of change of the distance between the origin and a moving pint on th egraph of y = sinx if dx/dt = 2 cm/second

2) All edges of a cube are expanding at a rate of 3 centimeters per second. How fast is the volume changing when each edge is (a) 1 centimeter and (b) 10 centimeters.

3) All edges of a cube are expanding at a rate of 3 centimeters per second. How fast is the surface area changing when each edge is (a) 1 centimeter and (b) 10 centimeters

4) The formula for the volume of a cone is V = 1/3 pir^2h. Find the rate of change of the volume if dr/dt is 2 in per minute and h=3r when (a) r= 6 inches and (b) r =24 inches

2007-12-02 15:22:01 · 2 answers · asked by Anonymous in Mathematics

2007-12-02 15:19:23 · 2 answers · asked by Lola S 1 in Botany

4 √72 + 3 √18 - 5 √6



3x^2 y^2
-------------
6xy^2

please show the steps.

2007-12-02 15:15:56 · 4 answers · asked by Anonymous in Mathematics

Assume all variables represent postive numbers

2007-12-02 15:14:48 · 4 answers · asked by Tonie M 1 in Mathematics

2007-12-02 15:14:03 · 3 answers · asked by upaliwickramathilaka 2 in Engineering

2007-12-02 15:07:36 · 11 answers · asked by fallennon 1 in Astronomy & Space

Can some one explain me how to prove that S5 is abelian

Let a = 1 2 3 4 5
4 5 3 2 1

and

b = 1 2 3 4 5
3 4 1 5 2

2007-12-02 15:06:22 · 2 answers · asked by Anonymous in Mathematics

I was wondering if anyone had any info and links on the physics behind the theremin.

2007-12-02 15:04:59 · 2 answers · asked by Rich W 2 in Physics

True or False

2007-12-02 15:00:41 · 3 answers · asked by Anonymous in Physics

An arithmetic series of 10 terms has a sum of 1100. The second term is twice the first term. What is the third

2007-12-02 14:58:15 · 3 answers · asked by Quagmire77 1 in Mathematics

2007-12-02 14:56:39 · 6 answers · asked by Anonymous in Earth Sciences & Geology

1. Where does glycolysis occur??

2. How many ATP are produced?

3. How many pyruvate molecules are produced?

4. How many NADH are produced?

2007-12-02 14:55:45 · 2 answers · asked by Anonymous in Botany

2007-12-02 14:54:41 · 2 answers · asked by danny l 1 in Mathematics

Okay this one is REALLY complicated, SO PAY ATTENTION!
Find the volume of a plane:

Plane: x/a + y/b + z/c = 1
Bounded by: x/a + y/b = 1
x = a – ya/b
y=b

With the knowledge that: xoy plane z = 0
yoz plane x = 0
xoz plane y = 0

I tried using double integrals, but it is a NASTY change of variables and has some even more IRRITATING substitutions. I think I you need to use integration by parts, but I tried that and I’m getting nowhere! ANY help would be appreciated, I just ask that you show a lot of work!

2007-12-02 14:53:50 · 2 answers · asked by Hua Zhi X 1 in Mathematics

2. A baseball (m = 140 g) traveling horizontally at 30 m/s moves a fielder's glove backward 35 cm when the ball is caught.

b. How much working was done on the ball?

c. What was the average force exerted by the glove on the ball?

2007-12-02 14:52:09 · 1 answers · asked by Robert 2 in Physics

Sickle-cell anemia is governed by autosomal recessive inheritance. What is the likelihood that a person who has two affected parents will have the disorder?

a) 25%
b) 100% (certain)
c) 50%
d) 0% (impossible)

2007-12-02 14:50:34 · 5 answers · asked by daitheflu99 2 in Biology