Science & Mathematics - 11 September 2007

It may just be that they don't find us funny...

2007-09-11 04:36:04 · 4 answers · asked by jonathan d 1 in Other - Science

this is for a Digital Logic Design project and your help will be much appreciated. its features include buzzing every one hour (also resettable), and lighting a bulb at 6:00 pm. it is entitled actually as SCHOOL CLOCK. thanks a lot (in advance)!

2007-09-11 04:35:50 · 2 answers · asked by Anonymous in Engineering

i have several problems connected to molarity and don't know how to solve them.it's not necessery to solve all of the problems just if u could explain the general idea how to solve such problems and please write it in details.



1. The density of solution prepared by dissolving 5.46g of copper nitrate in 22.0 ml of water is 1.19g/ml. Calculate the mass of solute in 15ml of solution?


2. Calculate the molarity of a solution prepared by dissolving 9.43g of Na2CO3 on 150ml of water and then diluting to a final volume of 250ml.

3. How many ml of 1.54M H3PO4 hold 0.249 moles?

4. Calculate the moles of sodium hydroxide in 750ml 1.23M NaOH.

thanks very much for the help

2007-09-11 04:34:18 · 2 answers · asked by ju-isis 2 in Chemistry

3% made at a factory were defective. 15 were defective. how many were produced that day.

could some one help me and walk me through this. decimals or fractions for work welcomed

2007-09-11 04:33:29 · 9 answers · asked by Anonymous in Mathematics

2007-09-11 04:32:09 · 6 answers · asked by Alexander 6 in Physics

Hi, a bit confused here, maybe you can help me out.

Boat 1 travels 326 KM per day
Boat 2 travels 423 KM per day
Distance between boats is 3560 KM
At what KM will they pass each other

thank you

2007-09-11 04:31:54 · 2 answers · asked by Kap 1 in Mathematics

A volleyball is served from a heigh of 0.78m and gives it an initial velocity of +7.7 m/s straight up.
a.) How high will the volleyball go?(m)
b.) How long will it take the ball to reach its maximum height?(s)

2007-09-11 04:31:07 · 1 answers · asked by PePPeRaNNe 1 in Physics

a)it is polar
b)it can ionize
c)it can hydrogen bond
d)it is very small

explanation please thanx

2007-09-11 04:30:33 · 2 answers · asked by Anonymous in Chemistry

if they have drawn just a linear line and not drawn the curvaceous line then how to find the slope?

2007-09-11 04:26:07 · 1 answers · asked by drshitalpt 1 in Physics

2007-09-11 04:25:45 · 4 answers · asked by Anonymous in Mathematics

2007-09-11 04:24:25 · 8 answers · asked by Anonymous in Mathematics

surds..

is there any rules when u subtract surds?

what would

√40 - √8 be?

pls explain in detail

what would √25 - √16 be?

pls explain in detail

what would 3√2 + 5√2 be?

pls explain in detail

and in questions like that, do you just add whatever is on the outside?(in this case 3 and 5)-why/why not

and what would

5√3 + 2√5 - 3√3 -7√5 be?

pls explain in detail.


best answer goes to first answer that explains in detail and is easy 4 me 2 understand. if the 1st person has answerd dont think that they will get best A for sure coz they probably didnt explain it well enough

so pls answer those questions and answer in detail.

thanks!!

best answer is waiting 4 you

2007-09-11 04:22:01 · 7 answers · asked by Anonymous in Mathematics

2007-09-11 04:21:13 · 14 answers · asked by srinatha11 1 in Mathematics

It's actually supposed to be quite simple, but I've been searching everywhere for the past hour and I couldn't find anything exact on it. How do I calculate the abundance of isotopes? I would really appreciate it if someone responded. Thank you.

2007-09-11 04:19:57 · 1 answers · asked by Anonymous in Chemistry

This is actualy a serious question as i have a few 21mg boxes left but need to step down on the intake now.

2007-09-11 04:15:48 · 3 answers · asked by Jay 3 in Medicine

1. how long is it in flight
2. the speed of the stone just before it hits the ground.

2007-09-11 04:15:40 · 4 answers · asked by port 1 in Physics

ok, i know i am addicted to aspirin. people say you cant get addicted to it but i am. i eat it atleast 4+ times daily and i crave it. i chew it out of habit without even realizing i have the bottle in my hand until after the fact. i constantly take it and i dont need it, theres not a day that goes by where i dont take atleast 4 or 5 uncoated aspirin. i need help because i heard it can cause ulcer, bleeding, blood thining, etc. and i dont want any of that but i cant help myself. someone please tell me how 2 get rid of my addiction

2007-09-11 04:14:58 · 9 answers · asked by . 2 in Medicine

For every n =1,2,3,... and x >=0, let f_n(x) = (1^x +2^x....+ n^x)/(n^(x+1)). Then, does f_n converge to some function f?
If x is an integer, then, by means of those expressions for the sum of integer powers of the natural numbers, it's easy to show lim f_n(x) = 1/(x+1). But does this remain true for every x >0?

If f_n converges to some f, then is the convergence uniform?
If we differentiate each f_n, then does f'_n converge fo f', supposing f_n --> f?

2007-09-11 04:14:45 · 3 answers · asked by Sonia 1 in Mathematics

2007-09-11 04:07:52 · 1 answers · asked by Malorie N 1 in Earth Sciences & Geology

What element is oxidized in the chemical reaction
3Cu + 8HNO3 → 3Cu(NO3)2 + 2NO + 4H2O?

a. Cu
b. H
c. N
d. O
e. H2O

2007-09-11 04:06:28 · 3 answers · asked by Anonymous in Chemistry

This term is sexist, outdated, silly, and irrelevant. It has been replaced in most progressive companies with "Designer". The term "Draftsman" is about as relevant as the term "Blacksmith", "Shoe Cobbler" or "Milkman".

At best, entry level employees are called "Drafters". Most large progressive companies promote their people to Designer I, II, III, and then to Senior Designer on to Lead Designer.

Lead Designers still produce some drawings, but do mostly supervision, quality control and checking. The skills and training needed by good designers these days are slightly more advanced than the old time draftsman of yesteryear.

If you are still using the term "Draftsman" or making references to the "Drafting" department, maybe you should just go ahead and file that application for Social Security.

Break out the Poli-grip and the rockin chair, old timer! But... please, get out of the engineering field.

2007-09-11 04:05:34 · 7 answers · asked by Anonymous in Engineering

1. the speed of the reaction depends on the reaction conditions describe how each of the following affects the speed of a reaction

a particle size of reactants
b concentration of the reactants
c tempreature of the reactants

Please help

cpkid

2007-09-11 04:03:17 · 8 answers · asked by Captain Awesome (Superhero) 2 in Chemistry

strictly decreasing.

2007-09-11 04:01:52 · 2 answers · asked by han 1 in Mathematics

The human eye is amazing, it can let you see in colour and in amazing detail that we have yet to match with our cameras.
How did it come about though, it would have taken ages through evolution? Also, why would we have needed an eye to start with, couldn't our other senses just get stronger.

This is my thought, what is yours?

Our eyes were developing and were very weak. Therefore, we used a form of supersonic location and then as our eye got stronger our hearing weaken. As a bat doesn't need good eyes it hasn't developed?

2007-09-11 03:58:11 · 7 answers · asked by ??? 2 in Biology

Can anyone gime me any ideas for something to make using PLCs. I have a limited amount of time to make something and I just don't know what to build.

2007-09-11 03:57:57 · 3 answers · asked by Jim 2 in Engineering

2007-09-11 03:56:13 · 4 answers · asked by romantic_v 1 in Astronomy & Space

what is the highest mountain in Minnesota and is it allowed to tourist during Fall and Winter?

2007-09-11 03:53:43 · 5 answers · asked by Anonymous in Geography

They say the sun rises in the East.East of where?

2007-09-11 03:51:59 · 20 answers · asked by riamaria75 1 in Astronomy & Space

2007-09-11 03:47:41 · 5 answers · asked by Anonymous in Engineering

thanks in advance..

2007-09-11 03:43:36 · 3 answers · asked by yoorin728 1 in Physics