Science & Mathematics - 23 July 2007

Let A = {1, 3, 4, 5} and B = {4, 5, 6, 9} and let S be the "divides" relation. That is,
for all (x, y) is an element of A x B, x S y <->x | y.
State explicitly which ordered pairs are in S and S –1.

2007-07-23 04:56:39 · 3 answers · asked by Anonymous in Mathematics

(cos x / 1-sin x) - tan x = (1/cos x)

2007-07-23 04:55:11 · 4 answers · asked by Anonymous in Mathematics

2cos^2(theta) = 3sin(theta) + 3, for that theta is greater than or eqaul to 0 but less than or equal to 2pi

2007-07-23 04:52:17 · 3 answers · asked by Anonymous in Mathematics

before couble years i read something about that and i tried it but imagining my self with light brown eyes(i had black eyes)and i kept imagining my self then after 3 monthes my eyes begain to be lighter and lighter then they became light brown eyes so do u thing that is true or not

2007-07-23 04:52:16 · 3 answers · asked by MADELINE 2 1 in Physics

Why will it catch on fire?

2007-07-23 04:51:39 · 9 answers · asked by L 2 in Agriculture

If this simulation was real, what would be the speed of the shells when they hit their target? (meters per second)

http://www.youtube.com/watch?v=NZReuMyPxXM

What would hit the target first, the shells or the sound of the cannon? (make your own estimates)

http://answers.yahoo.com/question/index;_ylt=Aj.J_k7JSRrE0FBumMbSRfzsy6IX?qid=20070723070003AAOojxc


Bonus Question:
Each shell would have the same momentum as a 16 pound bowling ball travelling at what speed on impact?

http://answers.yahoo.com/question/index?qid=20070723065912AAJZBhc&r=w

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2007-07-23 04:51:03 · 1 answers · asked by Anonymous in Physics

It is very possible that at a 4H fair i may be required to show a pig. I know nothing about how to show a pig, and have never worked with them.

2007-07-23 04:50:47 · 3 answers · asked by Meg 1 in Zoology

cos(2x) = (1-(tan x)^2)) / (1+(tan x)^2))

2007-07-23 04:48:53 · 3 answers · asked by Anonymous in Mathematics

Hi all

I want to know the cut point

y=√3x+1
y=3-x

I cant get near the answer if i draw it it shows me a real answer but it takes a lot of time to do that so i wanna calculate instead. Can someone explain this in a easy way please.

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2nd problem

2-x>√x


same prob cant get near the answer

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3rd and last problem

I want to know the comparison that gows to these points
(3,3) (10,6)

please explain it in a easy way



thank you very very very much!!!!

2007-07-23 04:46:41 · 1 answers · asked by playerr 3 in Mathematics

If you were in the water, how far away would you have to be to avoid being electrocuted?

2007-07-23 04:38:01 · 3 answers · asked by Anonymous in Physics

(sin2(alpha)) / (cos(alpha))

2007-07-23 04:37:45 · 3 answers · asked by Anonymous in Mathematics

2007-07-23 04:34:21 · 7 answers · asked by ian 1 in Astronomy & Space

This is an astronomy enquiry in the computation of terrestrial bodies using the celestial bodies

2007-07-23 04:34:01 · 3 answers · asked by Claude D 1 in Astronomy & Space

2007-07-23 04:31:12 · 3 answers · asked by Anonymous in Botany

H3O+(aq) + Cl -(aq) + NH3(aq) = NH4+(aq) + Cl-(aq) + H2O(l)
H3O+(aq) + NH3(aq) = NH4+(aq) + H2O(l)
HCl(aq) + NH3(aq) = NH4Cl(aq)
none of these

2007-07-23 04:28:44 · 1 answers · asked by Anonymous in Chemistry

I was in the lake the other day fishing, and when I got out I had 5 or 10 little tiny red things (less than half a centimeter long) sucking on my toes and between my toes, I quickly smashed them and tugged them off with my fingernails. Alot of them still didn't come off and I poured bleach to get them off (only thing I had, because I just finished laundry). Anyway, i'm just wondering what they are because I was bleading pretty bad afterwards, they didn't look like leeches from what I know, i've seen pictures of baby leeches and it didn't look like that, anyone have a clue on what they could be?

2007-07-23 04:28:20 · 7 answers · asked by dial8ted8 2 in Earth Sciences & Geology

fossils

2007-07-23 04:26:19 · 5 answers · asked by frednesbit2004 1 in Zoology

What is the solution to 2x^2+4x=-3? Showing me how to get to the solution will be very helpful. Thank you in advance

2007-07-23 04:26:01 · 6 answers · asked by jumba 1 in Mathematics

ok i am planning on doing a proyect on the decay of bones from soda, and im going to test this by submerging chicken bones on soda and checking for decay. I want to know if this is a good way of testing it or not. any suggestions?. Also does anyone know websites on what soda is and the ingredients and how it causes things to decay? if so, can you give me a couple of websites i could check out

-Thanks =)

2007-07-23 04:25:56 · 5 answers · asked by Anonymous in Chemistry

Solve the following by factoring:
a) x²- 6x -16=0

b) 6x² + 42x = 0

2007-07-23 04:24:16 · 2 answers · asked by DEE H 1 in Mathematics

Hi, I have a set of 20 questions, mostly multiple choice, that need to be solved. They deal with probability in the topic of statistics. If anyone can solve them with the appropriate work there will be a small reward for this. If interested I can e-mail you the set of questions but will need all the work by 4 p.m. tomorrow. You can also call me at 9178928934. Thanks for reading and trying to help out.

2007-07-23 04:23:07 · 3 answers · asked by Ahmed A 1 in Mathematics

Do they really need help or do they just want us to do their homework?

2007-07-23 04:19:54 · 4 answers · asked by MensaMan 5 in Mathematics

A rod with mass M = 1.4 kg and length L = 1.2 m is mounted on a central pivot . A metal ball of mass m = 0.7 kg is attached to one end of the rod. You may treat the metal ball as a point mass. The system is oriented in the vertical plane and gravity is acting. The rod initially makes an angle θ = 27 with respect to the horizontal. The rod is released from rest. What is the angular acceleration of the rod immediately after it is released?

2007-07-23 04:19:30 · 3 answers · asked by Anonymous in Physics

1. Suppose a classmate of yours has missed lecture for the last week. Write a full solution of the following problem so that your classmate can use it to help catch up with the material. you need to explain in detail each step of the precess you use to get to an answer.

a sled weighing 100.0N is pulled horizontally across snow so that the coefficient of kinetic friction between sled and snow is 0.2. A penquin weighing 70.0N rides on the sled, as in the figure.
(a) to start with, the penquin digs in his claws so he is firmly attached to the sled. What value of F do you need for the sled and penguin to move at constant speed?
(b) after a while, our penguin gets tired of holding on with his claws. Now the coefficient of static friction between penguin and sled is 0.7, find the maximum horizontal force that can be exerted on the sled before the penguin begins to slide off.

2007-07-23 04:19:10 · 2 answers · asked by sdajc0603 2 in Physics

If it is completely dark for one half of the year then light the other, how can you tell what time of it is?

2007-07-23 04:17:41 · 10 answers · asked by Slimm D 3 in Earth Sciences & Geology

i want few points about an austrelian animal kangaru. pls tell me

2007-07-23 04:17:32 · 3 answers · asked by kids s sylu 1 in Zoology

Integrate: Sin(3x) Sin(5x) dx

use the table of integrals.

2007-07-23 04:16:53 · 1 answers · asked by Anonymous in Mathematics

NaOH(aq)
Na2CO3(aq)
both (a) and (b)
neither (a) nor (b)

2007-07-23 04:10:47 · 3 answers · asked by Anonymous in Chemistry

solve for x ....-2√x = -1-x help!

2007-07-23 04:07:27 · 7 answers · asked by complexc25 2 in Mathematics

A passennger on a bus moving with uniform velocity lurches forward when the bus stops suddenly. Explain.

2007-07-23 04:07:20 · 3 answers · asked by emmasahottie 3 in Physics