Science & Mathematics - 21 December 2007

i am a student of mechanical engineering plz guide me . your cues would be so effective for me. tnx

2007-12-21 23:52:48 · 5 answers · asked by reza_hemmatdj 1 in Engineering

I see in many books it is given 22/7. it is given that it is a non-terminating rational number. But we know that 22/7=3.142857142857142857.....and the value of pie is 3.141592653589793.....Which one is the correct one???plz answer.....

2007-12-21 23:47:17 · 11 answers · asked by Anonymous in Mathematics

2007-12-21 23:37:37 · 5 answers · asked by Uttam S 2 in Zoology

I have a 5.5kW 3 phase motor (415v) on a vacuum pump.
We have measured the amps on each phase with a clamp meter and have found two phases are around 9 amps whilst the third is measuring 10.6 amps. The motor is configured in Star (one strap across three of the terminals).

Is this difference enough to cause a problem?
What would the problem be? Noisy, alternating speed??
The motor name plate states amps as 13.5. Will this be full load current? Typically how many amps would you expect a motor to draw if the full load current was 13.5 amps.

Any help very much appreciated as we are going to begin dismantling the vacuum pump any minute now and don't want to if the motor is suspect. Still got Christmas shopping to do / start!

Thanks in advance.

2007-12-21 23:26:07 · 5 answers · asked by Anonymous in Engineering

First one to answer correctly,will get 10 points!!

2007-12-21 23:12:56 · 13 answers · asked by fanatic000 4 in Mathematics

2007-12-21 23:05:52 · 1 answers · asked by Anonymous in Mathematics

2007-12-21 23:03:49 · 12 answers · asked by ronald willjef 2 in Physics

this is chemical reaction at 800C ,acually the powder was mixture between Pr2CuO4 +CuO reaction with CS2 gas.

2007-12-21 23:03:24 · 1 answers · asked by meso 1 in Chemistry

Katrina has a $50 gift voucher for an arts supply store.She wants to buy a sketch pad and some markers. Including taxes, a sketch pad costs $18 and a marker costs $4. use the inequality 4m +18 equal to or less than 50 to determine the number of markers, m, she can buy.

2007-12-21 23:02:45 · 3 answers · asked by Anonymous in Mathematics

2007-12-21 23:01:05 · 19 answers · asked by Franco 1 in Other - Alternative

2007-12-21 22:36:39 · 1 answers · asked by loNELYNomore0504 1 in Mathematics

2007-12-21 22:32:31 · 3 answers · asked by Math I 1 in Mathematics

My book says that it will be 0 as net force on body is 0. But I reason that it will be mg b'cos the reaction offered by liquid is mg.
Which ans is correct?
I would be grateful if you clear my conceptual doubt.
Thank you

2007-12-21 22:24:38 · 12 answers · asked by celestine preetham 2 in Physics

As we all know, because of market psychology when stocks increase in price on one day, they tend to decrease in price the next day. A payoff matrix shows the pertinent percents.

Now here's the payoff matrix.

If today the stock price increases, then the likelihood it will increase tomorrow is 0.2 and the likelihood it will decrease tomorrow is 0.8.

If today the stock price decreases, then the likelihood it will increase tomorrow is 0.6 and the likelihood it will decrease tomorrow is 0.4.

So the question is, in the long run, what fraction of the time will the stock increase in price?

2007-12-21 22:15:39 · 4 answers · asked by Anonymous in Mathematics

Im not referring to approximations. Anyone can guess a number and methodologically modify it for accuracy. Im talking a real algorithm or equation of what have you that was used for sole purpose of determining the value of e, not validating it or verifying it. How was the number originally computed? What mathematical background and conceptual basis was necessary for this technique?

2007-12-21 22:11:37 · 6 answers · asked by Anonymous in Mathematics

160505487354035
they will be somewhere around N39 32.343 W080 04.881
can anyone tell me what the right coordinates are

2007-12-21 22:09:46 · 1 answers · asked by pa_coonhunter 1 in Mathematics

2007-12-21 22:01:48 · 18 answers · asked by Anonymous in Astronomy & Space

1. Is it possible to have an equilibrium with AgCl dissolved in water where there is more Ag ions then there are Cl ions ?

2. in the equilibrium, the Ag and Cl are forming solids at the same rate as they are dissociating into their ions

if statement 2 is correct and in statement 1 it is possible,
then how does it work? coz then when Ag and Cl form solid, there would be some Ag left over since only one Ag goes with each Cl

2007-12-21 21:36:52 · 3 answers · asked by Anonymous in Chemistry

The unknown force to put the earth on its orbit. ???

2007-12-21 21:33:15 · 8 answers · asked by Anonymous in Astronomy & Space

I know that whenever I'm thinking about or learning Astronomy or anything to do with it, I'm always reminded about how small and insignificant I am. It kinda sucks. It especially sucks cuz I love Astronomy so much, but it just depresses me. Anyone else?

2007-12-21 21:32:12 · 14 answers · asked by sunny-d alright! 5 in Astronomy & Space

I dont get it, they say that its to keep October in the fall... But either way, October is still October.... doesnt really make a difference, I dont think people sit down to think about to say "Omg, its not fall yet... cause we didnt add that extra day"
Whats the deal?

2007-12-21 21:26:32 · 5 answers · asked by Anonymous in Weather

2007-12-21 21:15:02 · 4 answers · asked by Anonymous in Physics

If this is true then could please tell me why?
Thank you for your time..

2007-12-21 21:08:27 · 3 answers · asked by Fantail Flycatcher 3 in Biology

To check the efficiency of lamp with reference to input power.To find out heat loss to Environment.

2007-12-21 21:05:25 · 2 answers · asked by AFZAL 1 in Engineering

My heater in my house does not work so I purchased two small electric heaters. I just received a power bill for $400. On the bill it says I used an average of 50 kwh per day and last year I only averaged 15 kwh per day. Could those small heaters really make that much of a difference?

2007-12-21 21:05:00 · 6 answers · asked by a1francis2003 1 in Engineering

what is it about that makes us cry? even after getting away from one, my eyes still sting. what causes it?

2007-12-21 20:55:52 · 11 answers · asked by pullthetrigger 6 in Biology

2007-12-21 20:53:01 · 6 answers · asked by Anonymous in Mathematics

2007-12-21 20:45:54 · 19 answers · asked by Anonymous in Mathematics

How could this happen if evolution takes millions of years? Any genuine scientific explanation would be appreciated.

2007-12-21 20:45:47 · 5 answers · asked by Anonymous in Botany

2007-12-21 20:27:06 · 6 answers · asked by stevenr 1 in Mathematics