Science & Mathematics - 16 December 2006

2006-12-16 23:59:48 · 1 answers · asked by mares 1 in Engineering

I wanted to know the rating for post indicator valve whose dia is 500mm in a firewater pipeline in petrochemical plant. The material of the pipe is carbon steel, CLASS 150, design pressure is PN 25, working pressure is 12 bar.
Can anyone specify me the guideline to decide the flange rating for gate valve?

2006-12-16 23:59:21 · 4 answers · asked by mriyazuddin 1 in Engineering

This is true right>

2006-12-16 23:58:57 · 7 answers · asked by lorraine B 3 in Physics

2006-12-16 23:56:28 · 1 answers · asked by Ram Rimal 1 in Engineering

I have this differential equation

[y''(x)]^3 + x*y''(x) = 2*y'(x)

y''(x) - is the second derivative and y'(x) is the first derivative and the goal is to find y(x). * means multiplying.

Please help me with this one.

2006-12-16 23:50:19 · 1 answers · asked by Anonymous in Mathematics

Someone told me a few months ago and I forgot already

2006-12-16 23:47:17 · 8 answers · asked by Anonymous in Chemistry

2006-12-16 23:45:46 · 3 answers · asked by D Honest Guy 1 in Zoology

a) temp. increases b) temp. decreases c) depends on the temp. of the room

2006-12-16 23:42:34 · 12 answers · asked by curious 2 in Chemistry

2006-12-16 23:36:21 · 3 answers · asked by 3naz 1 in Engineering

According to darwan's theory, best characteristics holder body escape and other do not escape. So next genertation is more better than previous, but now all humans are living. how can human body evolute further?

2006-12-16 23:32:59 · 12 answers · asked by Rauf 1 in Biology

2006-12-16 23:32:03 · 10 answers · asked by jyothi m 1 in Mathematics

I checked it out. Where I live, the Tennessee river has a hard side of limestone cliffs and a soft side of muddy bottoms. Why is the Grand Canyon hard on both sides.

2006-12-16 23:31:25 · 3 answers · asked by Anonymous in Earth Sciences & Geology

2006-12-16 23:14:42 · 19 answers · asked by sachin3108 1 in Mathematics

2006-12-16 23:09:13 · 6 answers · asked by fernmanzo 1 in Biology

2006-12-16 23:05:14 · 8 answers · asked by pankaj 2 in Geography

I want to know how long it takes for an electron to absorb a photon, jump to a higher orbit, and then return to its lower orbit while emitting its photon. Is it known how long this process takes? Maybe a nanosecond or is that just too long?

2006-12-16 22:56:06 · 2 answers · asked by Bender[OO] 3 in Physics

Why do Mendel use pea to do the hereditary experiment?

2006-12-16 22:55:14 · 6 answers · asked by Princess Selina 1 in Biology

2006-12-16 22:52:01 · 10 answers · asked by huyen_vyvy 1 in Physics

Is it possible that there is no such thing as matter and all physical and chemical phenomenon can be explained in terms of pure energy interaction?

2006-12-16 22:50:35 · 8 answers · asked by Programmer 1 in Physics

If the denominator of a fraction is increased by 4, the new fraction is equal to one half. Find the original fraction if the numerator is three less than the denominator.

2006-12-16 22:47:48 · 12 answers · asked by Ken 2 in Mathematics

2006-12-16 22:43:22 · 5 answers · asked by Yuvraj K 1 in Chemistry

What is the balanced equation? What compounds are made from these compounds?

2006-12-16 22:43:05 · 5 answers · asked by Anonymous in Chemistry

of a spring as a longitudinal wave travels along it?

Thanks for all your help xXx

2006-12-16 22:31:01 · 1 answers · asked by Star dust 4 in Physics

I mean are they there but we can only see them when it gets dark?

2006-12-16 22:29:00 · 14 answers · asked by KT 1 in Astronomy & Space

2006-12-16 22:25:42 · 4 answers · asked by bache 1 in Astronomy & Space

2006-12-16 22:24:24 · 3 answers · asked by malinga p 1 in Biology

2006-12-16 22:22:16 · 2 answers · asked by al 1 in Astronomy & Space

2006-12-16 22:16:17 · 3 answers · asked by ndavos 2 in Mathematics

DEFG is a rectangle with width of 10 units and lenght of 24 units. A diagonal is drawn. A circle is inscribed in each triangle. Find the distance between centers A and B. Express answer in radical form. ( I am now on my 1st hour but I can't get the answer)

2006-12-16 22:13:54 · 6 answers · asked by the walking brother 2 in Mathematics

Who believes that there are extraterestrial (spelling?) life on mars? Has there been any proof? What are some of the weird truth about mars?

2006-12-16 22:03:10 · 2 answers · asked by kkds14 3 in Astronomy & Space