Science & Mathematics - 20 January 2007

the speed of a train is reduced uniformly from 10 m/s to 5 m/s while covering a distance of 150 m. what is its acceleration?

i need an explanation and a formula..
thanks!!

2007-01-20 04:42:42 · 6 answers · asked by Anonymous in Physics

Can you plese show the way you got the answer and what is the square root of it too.

2007-01-20 04:39:21 · 9 answers · asked by BENNETH[[98]] 2 in Mathematics

can someone please explain this to me? thanks :)

2007-01-20 04:39:09 · 18 answers · asked by plasticbag 2 in Mathematics

(a)i ran int[x/(4-x^2)^2]dx from
x=0 to x=3 through a computer
and it came up with infinity-

however, i did a bit of juggling
and by putting u=4-x^2 i came
up with -9/40 for x between 0
and 3-

which version(if either) do you
believe to be correct and why?

(b)what is a singularity in
mathematics?
does it exist?

if you want to be brave,be
careful!

2007-01-20 04:39:04 · 9 answers · asked by Anonymous in Mathematics

the value of pi is figured out to be 3.14.But question that arises is"HOW?"

2007-01-20 04:36:27 · 9 answers · asked by aman_atal_007 2 in Mathematics

Find the equation of the circle tangent to the x-axis with center (8, -3)

I'm really confused on how I get the radius to use in the following step

(x-h)^2 + (y-k)^2 = r^2

From my knowledge so far, I can make it look like this, but no farther

(x-8)^2 + (y+3)^2 = R^2

HELP

2007-01-20 04:35:36 · 3 answers · asked by mgunterksu 1 in Mathematics

-life problem. Give a detailed strategy for this in the context of teaching a child about " area". 2) Suppose you are teaching a Class 2 child about different shapes and sizes. What are the different stages of teaching at which you would evaluate her, and how 3) How would you define a decimal fraction? Why do such numbers have this name? Suppose a number is written as 1.134 in the base 5 system. Which number does this represent in the base 10 system? 4) Outline a series of three distinct activities to help a child realise that the quality in a fraction is dependent on what the whole is. Are these activities at different levels of difficulty? Give reasons for your answer. 5) The following statements are often made about mathematics. How would you explain them to a Class 5 child, in the context of fractions?
i) Mathematics is powerful
ii) Mathematical knowledge is hierarchically structured
iii)Mathematics is everywhere.

2007-01-20 04:35:18 · 1 answers · asked by navin p 2 in Mathematics

For the height, I mean the distance from one side to the other. I need to make some patterns but I don't know how long the sides need to be.

2007-01-20 04:34:24 · 1 answers · asked by Susie Q 1 in Mathematics

2007-01-20 04:34:17 · 6 answers · asked by ♫ Music is Love ♥ 6 in Chemistry

x - 2y = 8
x = y = 1

A) one B) None C) Infinite

2007-01-20 04:34:11 · 6 answers · asked by Anonymous in Mathematics

Also i need a website where i can find problem and solutions on Gauss Seidal Method

2007-01-20 04:31:05 · 1 answers · asked by Shoeb 2 in Mathematics

x + y = 4
-x + y = 2

A) one B) None C) Infinite

2007-01-20 04:30:09 · 4 answers · asked by Anonymous in Mathematics

Dont speak about Frank & Wen (respect).... Dont speak about chemistry and biology facts from the book. What do YOU think?

2007-01-20 04:29:50 · 4 answers · asked by johnny 1 in Biology

very urgent
ic number
SM0038

2007-01-20 04:28:01 · 2 answers · asked by karate 1 in Engineering

since there is an infinite amount of numbers in the interval between 0 and 1 and there is also an infinite amount of numbers in the interval between 0 and 10, the two intervals have the same number of numbers. so why is 10 bigger than 1?

2007-01-20 04:27:59 · 12 answers · asked by smokesha 3 in Mathematics

Also i need a website where i can find problem and solutions on Gauss Seidal Method

2007-01-20 04:27:05 · 2 answers · asked by Shoeb 2 in Engineering

How do you make dry ice (not using labratory chemicals, or talking science, just plain home mad ingrediants to make dry ice)? I need to know bc i have a science project!

2007-01-20 04:26:10 · 7 answers · asked by Anonymous in Chemistry

Extra: What makes shampoos so effective against oily substances in our hair?

2007-01-20 04:25:03 · 3 answers · asked by Philippmikio 1 in Biology

2007-01-20 04:23:59 · 10 answers · asked by ramy 2 in Geography

here is the definition of congruent triangle in my book

http://img262.imageshack.us/my.php?image=congruent3qm.jpg

i have a question on it.

there are 6 statements , for example a,b,c,d,e,f .

Q1; my question is , if at least one of them is satisfied , then can we call 2 triangles are congruent ? or the 2 triangles must have to satisfy ALL the above conditions ? which is correct ?


Q2; please look at condition (d)...

it says
but if i change this to ,
please note ,i have just changed the ordering of side in the above .....I am not sure whether i still would be able to call these triangles as congruent ....does the change of ordering like above affect at all ?.......please clarify this doubt.

2007-01-20 04:20:12 · 4 answers · asked by sanko 1 in Mathematics

Why do mirrors switch left-right and not top-bottom? Why do ambulances write "Ambulance" backwards rather than upside-down?

2007-01-20 04:19:44 · 5 answers · asked by coza b 2 in Physics

I'm thinking of conducting some research into CT urology (kidneys, ureter and bladder) and patient positioning for identifying the position of renal calculi. Doctors I have worked within placement in hospitals around Wales either position their patients supine (on their back) or prone (on there front) and I'm wondering if there are reasons behind their technique?? Also, is the patients position written in protocols or is it purely doctors preference?? Any help with answering my questions would be gratefully recieved, thanks!!

2007-01-20 04:19:03 · 3 answers · asked by Penny Breerton 1 in Medicine

Anthroponoses im not too sure!! thank you!

2007-01-20 04:18:06 · 6 answers · asked by Anonymous in Zoology

2007-01-20 04:16:54 · 8 answers · asked by Karolina B 2 in Earth Sciences & Geology

A prime number test?

Given an integer n >= 2. Then: (a) If n is a factor of 2^n - 2, then n is prime, and (b) If n is not a factor of 2^n - 2, then n is not prime.

Are statements a and b both true? I test all the numbers up to 30, and it worked every time:

If n = 2, 2^2 - 2 = 2. 2 is a factor of 2, so 2 is prime.

If n = 3, 2^3 - 2 = 6. 3 is a factor of 6, so 3 is prime.

If n = 4, 2^4 - 2 = 14. 4 is not a factor of 14, so 4 is composite.

If n = 5, 2^5 - 2 = 30. 5 is a factor of 30, so 5 is prime.

If n = 6, 2^6 - 2 = 62. 6 is not a factor of 2, so 6 is composite.

If n = 7, 2^7 - 2 = 126. 7 is a factor of 126, so 7 is prime.

If n = 8, 2^8 - 2 = 254. 8 is not a factor of 254, so 8 is composite.

If n = 9, 2^9 - 2 = 510. 9 is not a factor of 510, so 9 is composite.

If n = 10, 2^10 - 2 = 1022. 10 is not a factor of 1022, so 10 is composite.

If n = 11, 2^11 - 2 = 2046. 11 is a factor of 2046, so 11 is prime.

If n = 12, 2^12 - 2 = 4094. 12 is not a factor of 4094, so 12 is composite.

If n = 13, 2^13 - 2 = 8190. 13 is a factor of 8190, so 13 is prime.

If n = 14, 2^14 - 2 = 16382. 14 is not a factor of 16382, so 14 is composite.

If n = 15, 2^15 - 2 = 32766. 15 is not a factor of 32766, so 15 is composite.

...and so on. If both statements are not true, where is the first counter-example??

2007-01-20 04:16:18 · 8 answers · asked by Anonymous in Mathematics

there are two derserts , one is polar desert ,and other is the hot desert, both of them are dry and have a very low specific humidity (aboslute humidity ) but the relative humidity in the polar dersert is very high ?> can someoen tell me why >?

2007-01-20 04:10:11 · 3 answers · asked by Anonymous in Weather

Graph the functions y = x and y=2square root x on the same graph (by plotting points if necessary). Show the points of intersection of these two graphs.

2007-01-20 04:08:43 · 9 answers · asked by Lana G 1 in Mathematics

2007-01-20 04:08:11 · 1 answers · asked by goring 6 in Astronomy & Space

2007-01-20 04:05:58 · 2 answers · asked by oooo baby! 3 in Zoology

i think this is how you write it?how do i solve 4/11 divided 3/8?what are the necessary steps to solve this?

2007-01-20 04:05:07 · 18 answers · asked by carlos 2 in Mathematics