Science & Mathematics - 5 December 2007

A 1500 kg car is moving along a level road at 60 km/h

2007-12-05 04:33:26 · 1 answers · asked by Anonymous in Physics

i am really stuck on this.....i got the following equation
C6H7NO + C4H6O3-----C8H9NO2 + C2H4O2
the following info

specific density of acetic anhydride (C4H6O3) is 1.08g/ml
relative molecular mass of paracetamol (C8H9NO2) is 151.2
in an experiment you found out the

mass of 4-aminophenol ( C6H7NO) is 3g
mass of paracetamol is 4g
what is the percentage yield?

10 pts for anyone who can help, many thanks

Jim

2007-12-05 04:32:48 · 1 answers · asked by Anonymous in Chemistry

We work 4 x 12 hour shifts (nights) and 4 nights off. Currently we are paid a 40 hour week, but I am positive we are working an equivalent of a 42 hour week . Have tried to explain to management using calculations but just cannot seem to get through to them. They talk about counting all our hours up over the year, can anybody help with a simple explanation of how to work it out. thanks Steve

2007-12-05 04:30:22 · 3 answers · asked by Anonymous in Other - Science

if suppose a sine wave starts from 0degree and completes its cycle in 360 degrees .... and for the next complete cycle it will start from where it have finished and that part of the second cycle has a shape of negative of a normal sine wave...
How can we synthesize such a wave form ...??

2007-12-05 04:28:42 · 1 answers · asked by lamrin 1 in Physics

please help, thank you.

2007-12-05 04:27:06 · 2 answers · asked by weetereatter 2 in Mathematics

Don't ask where this came from because I haven't the slightest idea. But I am not trying to rig a craps game.

In theory, is it possible that some number of dice could be placed in a cup in a precise orientation, shaken in a precise manner, and thrown with a precise velocity and come up with the same results every time. In this theoretical case, you would probably need to use a robot to control all action.

Is this theoretically possible or are there just too many randomizing elements for this to work?

2007-12-05 04:25:44 · 2 answers · asked by Justin H 7 in Physics

The maximum number of truck routes, t, that are needed to provide direct services to n cities, where no three cities lie in a stright line, given by the equation t= n^2 -- n all over / or divided by 2. How many truck routes will be needed to run service between 7 cities???

The answer I got was 21 truck routes. Is that correct?

2007-12-05 04:25:04 · 2 answers · asked by Jewel 1 in Mathematics

2007-12-05 04:22:59 · 6 answers · asked by Riki R 1 in Mathematics

I saw this spider in my work room, I live in Los Angeles County in Southern California. Does any one know what kind of spider it is, is it dangerous

2007-12-05 04:22:55 · 2 answers · asked by Rebekah W 1 in Zoology

i am doing a report on oil....could you help me out...do you know how much longer that the world suppt of oil is going to last??

any other facts about oil or oil drilling would be great too :)

thnks

2007-12-05 04:20:25 · 3 answers · asked by Anonymous in Earth Sciences & Geology

2007-12-05 04:20:10 · 6 answers · asked by Racheal H 1 in Mathematics

2007-12-05 04:19:12 · 1 answers · asked by waleed 1 in Chemistry

2007-12-05 04:17:06 · 2 answers · asked by Anonymous in Chemistry

2007-12-05 04:15:08 · 2 answers · asked by Anonymous in Earth Sciences & Geology

I have GMT Time column in XL sheet, I need to convert to CST in next column. How to do?

2007-12-05 04:13:44 · 3 answers · asked by redlotus72 2 in Mathematics

You know how scientists say that life cannot exsist without liquid water? Well is that statement completely true when it may come to life on another planet? How can this statement be true if science hasn't been able to physically take human life to another planet, or observe planets out of our solar system? Wouldn't this rule only apply to life on Earth.

2007-12-05 04:12:09 · 11 answers · asked by Kyos girl 4 in Astronomy & Space

2007-12-05 04:11:06 · 7 answers · asked by NT 1 in Mathematics

He was studying to be an electrical engineer but now he wants to major in physics. What kind of jobs can he get after college?

2007-12-05 04:10:36 · 10 answers · asked by tink65804 2 in Physics

or both together

2007-12-05 04:06:38 · 4 answers · asked by Anonymous in Medicine

need to know! thanks

2007-12-05 04:05:02 · 13 answers · asked by ♥*~Country Girl~*♥ 2 in Geography

2007-12-05 04:04:48 · 9 answers · asked by Lee94 2 in Astronomy & Space

a.) the number of electron collissions per second in the wire
b.) the drift speed of the electrons in the wire
c.) the speed of the electric field moving in the wire
d.) the resistance of the material the wire is made of

2007-12-05 04:03:28 · 7 answers · asked by Stephanie C 1 in Physics

as follows. S1=0 & S0=0 means no change. S1=0 & S0=1 means clear register to 0. S1=1 & S0=0 means complement output. S1=1 & S0=1 means load parallel data.

2007-12-05 04:02:07 · 1 answers · asked by Craig P 2 in Engineering

The answer should be -(1/(2x^3/2)) but I'm having trouble getting to it using limits.

I have to use limits on this question which makes it very annoying :( Any help on where to start would be appreciated

2007-12-05 03:59:00 · 5 answers · asked by John Avry 2 in Mathematics

Erm..well, are pyramids earthquake resistant? If not, what other availabilities are there in order to build a model of some sort of earhtquake resistant building?

2007-12-05 03:58:22 · 4 answers · asked by Confused.com! 1 in Earth Sciences & Geology

What is compressibility of water at critical point?
Why?

2007-12-05 03:55:16 · 4 answers · asked by Alexander 6 in Physics

As you can see in the video (sources) the takeoff speed/velocity of Apollo is look like very small and after certain height it should fall again on the moon’s surface by its gravitational pull which is six times weaker than earth. Also was rocket fired for escape velocity from moon’s gravitational pull. How many total number of rockets were used for changing direction and speed in this mission, when and where? Any idea or source.

http://www.hq.nasa.gov/alsj/a15/a15v_171...
http://www.youtube.com/watch?v=cOdzhQS_M...

2007-12-05 03:53:50 · 3 answers · asked by ? 3 in Astronomy & Space

What is entropy of the gas?
(Hint: compress the gas isothermally to zero volume)

2007-12-05 03:51:25 · 1 answers · asked by Alexander 6 in Physics

2007-12-05 03:51:07 · 6 answers · asked by kuc2215 2 in Mathematics

My husband found some curious rock formations on our property and we are looking for someone in this field of interest..........to come to our place and look at this...........only serious suggestions please, thank you........possible indian carvings,etc.

2007-12-05 03:43:37 · 2 answers · asked by smileyfish 4 in Earth Sciences & Geology