Science & Mathematics - 21 January 2007

Find n:

n- 13/15= 19/30

2007-01-21 16:47:39 · 4 answers · asked by Anonymous in Mathematics

it is an assignment which i have to submit as an veterinary medicine student.so,i require exact knowledge

2007-01-21 16:46:26 · 2 answers · asked by khuram shahzad 1 in Zoology

According to the climatic situation in moon i feel there is no more possibilty to land in moon now a days. But the world is accepting the moon landing. how.

2007-01-21 16:46:23 · 20 answers · asked by afroz 1 in Physics

I want to teleport my shoes, food, clothing, animals, human. I want to be able to travel from California to New York in 10 seconds without plane or rocket.

2007-01-21 16:45:36 · 8 answers · asked by ocean 3 in Astronomy & Space

The length of a rectangle is 2 cm more than twice its width. If the perimeter of the rectangle is 52 cm, find the dimensions of the rectangle. Define variables, set up equation and solve.

2007-01-21 16:45:19 · 2 answers · asked by sittinncat 1 in Mathematics

The length of a rectangular garden is 8 ft less than 2 times its width. If the perimeter of the garden is 44 ft, find the dimensions of the garden. Define variables, set up equation and solve.

2007-01-21 16:44:12 · 3 answers · asked by sittinncat 1 in Mathematics

and if you could briefly, how did you come to that conclusion?

2007-01-21 16:39:47 · 6 answers · asked by dfgh d 1 in Physics

So I'm doing a project on food poisoning, and my science teacher wants us to give a description on food poisoning. Well, I looked it up and it only shows diseases that are cause by food poisoning. I couldn't find anything with descriptions that went with food poison. How should I write up the descriptions for it? Should I just describe how the diseases look like or what?
HELP PLEASE!

2007-01-21 16:38:01 · 4 answers · asked by bluu_fool 1 in Biology

2007-01-21 16:36:53 · 3 answers · asked by sandeep singh 1 in Engineering

I am not good at science so I need some help! I had my elementary students list examples of physical changes. Their book listed water changing to ice or steam as one, or cutting or shaving wood. I read somewhere that physical changes can be reversed... but if I cut up a piece of paper, I can't reverse it without using tape or something. So what am I missing here? And as far as the responses I got, there were some clever/slightly deranged kids. One said animals, when they die. They're still animals. Or if you cut up a dog, it's still a dog. Or if you add salt to water, the salt is still there. Which confuses me- if you add kool aid mix to water, you dont have water anymore, you have kool aid. Can it be reversed? And lastly, someone said growing, like a baby growing to be an adult. Does that make sense? But the change from a seed to a flower would be chemical change, yes? Thanks for your help science people.

2007-01-21 16:35:53 · 6 answers · asked by Janet R 1 in Chemistry

2007-01-21 16:34:19 · 2 answers · asked by sandeep singh 1 in Chemistry

NOT counting the obvious liver and other problems associated with the acetaminophen, as that is another issue all together. i know it is usualy perscribed in 5, 10 and 15 mg tablets. so i guess this is more of a hydrocodone question.

im not trying this or some kind of junkie, just have a hobby of drugs and how they interact with the body. :)

2007-01-21 16:31:29 · 8 answers · asked by Aaron 1 in Medicine

hill reaction, calvin cycle. aerobic and anaerobic respiration. lactic acid pics.

2007-01-21 16:30:21 · 2 answers · asked by motoson 4 in Biology

mech. engg , interested in computer so how will SAP work for me. i am interested in SAP .

2007-01-21 16:27:17 · 3 answers · asked by sid 1 in Engineering

Their are two math problems Im stumped on, I forgot how to do both, but the second I mainly cant get the answer. Please help.


1. (-2)-(-9)= a) 7 b) -11 c) -7 d) 11.
What side do I start on since they are both in parenthesis?

2. Sara owns a small business. There was a loss on $9 on MOnday and a loss of $20 on Tuesday. On Wenesday there was a profit of $19 and on Thursday there was a loss of $12.Find the total profit or loss.

I cant figure it out, I have been trying forever.

PLease help

2007-01-21 16:24:58 · 6 answers · asked by Anonymous in Mathematics

is it like ultrasound? where you have low frequencies penetrate better than high frequencies?

2007-01-21 16:24:26 · 2 answers · asked by Anonymous in Physics

I don't get it. It's just a joke, or there's scientific evidence? Gimme an explain plz. thx

2007-01-21 16:20:23 · 6 answers · asked by Stanley R 2 in Chemistry

The OH radical disproportionates according to the elementary chemical reaction OH + OH H2O + O. This reaction is second order in OH. The rate constant for the reaction is 2.0 x 10-12 cm3/molecule · s at room temperature. If the initial OH concentration is 1.0 x 1013 molecules/cm3, what is the first half-life for the reaction?

2007-01-21 16:19:57 · 2 answers · asked by jasmine m 1 in Chemistry

Pls give prove .
Thank you 4 your help

2007-01-21 16:19:51 · 4 answers · asked by top_ace_striker 2 in Mathematics

X^2 - 2X - Y^2=4
.
.
.
(1)^2 - 2(1) -y^2=4,,
1 - 2 -y^2 = 4,,
(-1) - y^2 = 4,,
-y^2 = 5,,
y^2=(-5),,
,
,
,
(-1)^2 - 2(-1) -y^2=4,,
1 +2 - y^2 =4..
3 - y^2 = 4..
-y^2 = 1..
y^2 = (-1)..
,
,

,

I know this exhibits x-axis, and y-axis symmetry. however, I believe it is not because I have obtained an equivent equation by replacing a postive value with a negative. I believe it is because of obtaining the irrational solution. Is this correct to think along these lines? Am I choosing incorrect values maybe, to test for symmetry?
Thank you kindly " once again."

2007-01-21 16:18:54 · 2 answers · asked by Anonymous in Mathematics

Refer to the gas-phase decomposition of ethylene chloride:

C2H5Cl products

Experiment shows that the decomposition is first order.

The following data show kinetics information for this reaction:

Time (s) ln[C2H5Cl] (M)
1.0-1.625
2.0-1.735
What is the rate constant for this decomposition?

2007-01-21 16:18:48 · 2 answers · asked by jasmine m 1 in Chemistry

2007-01-21 16:18:28 · 4 answers · asked by cult_king_666 1 in Physics

2007-01-21 16:18:22 · 3 answers · asked by ajmarkesha 1 in Mathematics

The highly radioactive plutonium in nuclear waste undergoes first-order decay with a half-life of approximately 24,000 years. How many years must pass before the level of radioactivity due to the plutonium falls to 1/128th (about 1%) of its original potency?

2007-01-21 16:18:18 · 4 answers · asked by jasmine m 1 in Chemistry

take home test, my teacher is stupid. thx!

2007-01-21 16:17:23 · 6 answers · asked by Rosie L 2 in Botany

and Prove too..

I think converge.. is it using integral test..?
help

2007-01-21 16:17:06 · 2 answers · asked by top_ace_striker 2 in Mathematics

A car accelerates uniformly and reaches a speed V of 3.40 m/s in 8.00 seconds. Calculate the distance traveled by the car from a time of 0.30 to 7.00 seconds.

Ok, so I calculated the acceleration to be 0.425 m/s^2, but I am not sure which motion equation to use because I keep getting the wrong answer.

Thanks for any help.

2007-01-21 16:17:03 · 2 answers · asked by Defcon6 2 in Physics

2007-01-21 16:15:27 · 4 answers · asked by Anonymous in Biology

can someone explain how to do this?

2007-01-21 16:15:13 · 9 answers · asked by Anonymous in Mathematics

2007-01-21 16:13:19 · 13 answers · asked by Christ' Soldier 2 in Mathematics