Science & Mathematics - 28 November 2007

2007-11-28 21:33:29 · 13 answers · asked by robinmorton1993 1 in Engineering

what type of rocks is the rocks that you can find around swimming pools? they are round.

also, what type of rock is this? it has black and darck brown stripes going horizontal

thanks a lot

2007-11-28 21:25:38 · 6 answers · asked by poonnapat 2 in Earth Sciences & Geology

We did the conservation of mass acctivty.
My qeustions are that...
1. How come bodns were not included in the mass?
2. How come this reaction needed 2 oxygen molecules and water moleculres but only 1 of the others?
1). 1ch4+2o2
2).2o2

1. 1co2
2. 2 o2 molecules

2007-11-28 21:18:36 · 1 answers · asked by angel 2 in Chemistry

A. Between what two consecutive integers do each of the following numbers like?

1. square root of 21
2. square root of 50
3. square root of 70
4. square root of 98
5. square root of 145
6. square root of 250
7. square root of 310
8. square root of 450
9. square root of 555
10. square root of 650
11. cube root of 16
12. cube root of 60
13. cube root of 200
14. fifth root of 150
15. fourth root of 175



B. Find a one-decimal place approximation for each of the following expressions:

1. square root of 10
2. square root of 18
3. square root of 30
4. square root of 37
5. square root of 50
6. cube root of 8
7. fifth root of 26
8. fourth root of 45
9. square root of 65
10. cube root of 99
11. negative square root of 20
12. negative cube of 35
13. negative fourth root of 200
14. cube root of 15
15. cube root of 30




Pls. help me pls. i need it now pls. pls. i'm begging you pls. pls. pls. very pls.

2007-11-28 21:13:50 · 4 answers · asked by Anonymous in Mathematics

as i am sitting at my desk at the mo and since taking them i feel very drowsy, dizzy and sick, is this normal and will it affect my work?

2007-11-28 21:13:35 · 2 answers · asked by Kelly S 1 in Medicine

hoe ll we modify the relation of the phase difference...

2007-11-28 21:03:38 · 1 answers · asked by zaeee 1 in Physics

2007-11-28 20:54:44 · 3 answers · asked by Anonymous in Astronomy & Space

and why?

2007-11-28 20:47:46 · 7 answers · asked by cucumis_sativus 5 in Botany

OK, so a person jumps off from a 10-meter springboard...h in meters and t in seconds, after the diver leaves the board her height above the water is given by
-4.9t^2+8t+10

F(x)=-4.9(t+.8)^2+13.1....vertex form

BUT

How long does it take the diver to reach the water

At what time is the diver EXACTLY 11m above the water

For how long is the diver 11m above the water

PLEASE try to use a graphing calculator and show the strokes because I don't know how to do these...and include ur answers so I can double check...

THANKS!!!

2007-11-28 20:30:15 · 1 answers · asked by A A 1 in Mathematics

The Big Bang will expand for ever (the Big Chill). Infinity is by definition something that can't be measured. How can it have a start in the Big Bang?
The closest thing to infinity and eternity we can imagine is a two-dimensional being on a volumetric surface such as a sphere. It can move for ever without reaching an end. But it doesn't have a start either, right?

2007-11-28 20:29:50 · 13 answers · asked by Michel Verheughe 7 in Astronomy & Space

there is a population problem.... everyone knows it

2007-11-28 20:28:52 · 26 answers · asked by Anonymous in Chemistry

Establish the Bernoulli inequality:

If l+a>0, then (l+a)^n is greater or equal than 1+na for all positive integers n.

2007-11-28 20:21:40 · 2 answers · asked by garlin104300 1 in Mathematics

2007-11-28 20:17:15 · 9 answers · asked by MIke y 2 in Astronomy & Space

What is the probability that all the heads occur at the start of the sequence?

2007-11-28 20:16:38 · 4 answers · asked by David 2 in Mathematics

The 120 seats on an Alaska Airlines flight were completely booked, with each of the 120 passengers having different assigned seats. The passengers entered the plane one-by-one. Unfortunately, the first passenger, Joe Isclumsy, couldn't read his boarding pass because he spilled coffee on it and sat in a (uniformly) random seat. Each subsequent passenger sat in their assigned seat if it was available when they entered and sat in a (uniformly) random empty seat otherwise. What is the probability that the last passenger sat in their assigned seat?

2007-11-28 20:14:48 · 1 answers · asked by David 2 in Mathematics

Why does r = 1/ [sin(theta) - cos(theta)] become y - x = 1

2007-11-28 19:56:10 · 2 answers · asked by jeff h 1 in Mathematics

I don't know how to find the zeroes of complex polynomials like this:

x^4 - 2x^3 - 2x^2 - 2x - 3

Could you help show me how? Thanks.

2007-11-28 19:45:43 · 6 answers · asked by Anonymous in Mathematics

4- l x-4 l Closed Interval [1,6]

Find the min and max

2007-11-28 19:37:34 · 4 answers · asked by Adam d 1 in Mathematics

In a slow-pitch softball game, a 0.200 kg softball crossed the plate at 11.00 m/s at an angle of 45.0° below the horizontal. The batter hits the ball toward center field, giving it a velocity of 46.0 m/s at 30.0° above the horizontal.

(a) Determine the impulse delivered to the ball.
_____ N·s (magnitude)
_____ ° (above the horizontal)

(b) If the force on the ball increases linearly for 4.00 ms, holds constant for 20.0 ms, then decreases linearly to zero in another 4.00 ms, what is the maximum force on the ball?
_____ N (magnitude)
_____ ° (above the horizontal)

2007-11-28 19:36:28 · 1 answers · asked by shawtyy 1 in Physics

We know that many of the survivors of Hiroshima bombing were genetically mutated, this mutation effect their progeny. I want to know is/are there any children born now a days with disablity of that mutation

2007-11-28 19:35:43 · 1 answers · asked by Naser 1 in Biology

Not sure if you'd call this paranormal, but here goes...About a month ago I dreamt that I was in a room full of mirrors and then I began to choke myself; like an external force was making me do it. I started to get angry and scared so I woke up. When I awoke, on the ceiling I saw the Hindu god Shiva circling above me - with lotuses in the corners opening and closing. The image covered the whole ceiling; it was in 2 dimensional form and aqua/blue in colour (with shimmering light aswell). It felt as though it was alive. I had to blink a few times to make sure I wasn't dreaming it. He stayed up there for awhile, but then disappeared when I started relating my choking dream to him.

*In Hindu religion it is said that Shiva is the auspicious one, god of luck and destruction. He is the strongest of the trinity of gods. (I'm not Hindu by the way - I'm Serbian Orthodox.)

Is there a meaning behind this (or am I just being very delusional)?

2007-11-28 19:33:32 · 11 answers · asked by mima... 4 in Paranormal Phenomena

2007-11-28 19:33:11 · 4 answers · asked by bone 4 in Engineering

because i have always wondered if they were color blind, then i thought how did we find out.

2007-11-28 19:31:51 · 4 answers · asked by Anonymous in Zoology

2007-11-28 19:29:50 · 5 answers · asked by Answer Seeker 1 in Mathematics

What is the remainder when A is divided by 9?

2007-11-28 19:26:31 · 6 answers · asked by Answer Seeker 1 in Mathematics

The following are beta emitters. Write the reactions produced in each case:

1. Carbon-14
2. Strontium-90
3. Potasium-40
4. Nitrogen-13

The following are alpha emitters. Write the reactions produced in each case:

1. Uranium-238
2. Thorium-230
3. Uranium-235
4. Radon-222

Polonium 214 decays when it loses an alpha particle. Write the nuclear equation.

Argon-39 decays to become Potassium-39. Write the nuclear equation.


If somebody could just explain to me how i'm supposed to find the answers for these then that would be great.

2007-11-28 19:05:48 · 1 answers · asked by emando16 2 in Chemistry

2007-11-28 19:05:15 · 11 answers · asked by Anonymous in Astronomy & Space

Still working on this darn paper....

I was given these numbers and ask to find the nth term.

6 8 12 18 26 36 48 62

Somehow I came up with this function:

x^2 - x + 6

She marked it as correct but now that I am trying to put the entire paper together I just can't seem to get it to workout.
Is this correct or have I totally screwed up?

Thanks!

2007-11-28 19:04:47 · 6 answers · asked by Confused 1 1 in Mathematics

Can anyone help me solve this problem? I am new at this and I am a little confused.

2007-11-28 19:01:41 · 8 answers · asked by Syl 2 in Mathematics

The displacement of a particle at t = 0.300 s is given by the expression x = (5.00 m) cos(3.00t + 1/2), where x is in meters and t is in seconds.
(a) Determine the frequency and period of the motion.
Hz
s
(b) Determine the amplitude of the motion.
m
(c) Determine the phase constant.
rad
(d) Determine the displacement of the particle at t = 0.300 s.
m

2007-11-28 18:57:25 · 1 answers · asked by LOWDOWN 1 in Physics