Science & Mathematics - 20 November 2007

2007-11-20 01:13:16 · 7 answers · asked by Rebecca S 1 in Earth Sciences & Geology

A power generating facility is designed on DC power generation, with a low RPM Dynamo, how can we convert the out put into A/C and what shall be the conversion factor

2007-11-20 00:36:50 · 5 answers · asked by starsysmzg 3 in Engineering

2007-11-20 00:33:51 · 13 answers · asked by Anonymous in Paranormal Phenomena

a rope is used to pull a 10 kg block across the floor with an acceleration of 3 m/s2. if frictional force acting on the block is 50 N. what is the tension on the rope?

thanks

2007-11-20 00:29:39 · 4 answers · asked by sahar 1 in Physics

A) Find the constant term that hsould be added to make the following expression a perfect-square trinomial: x^2-2x

B)Find the axis of symmetry:y=-x^2+4x-6

C) Find the x-intercepts:y=x^2+4x

2007-11-20 00:24:38 · 7 answers · asked by chas_lynn2002 2 in Mathematics

The only reason we see stars with our naked eye from earth is that we are viewing them from within a galaxy (the Milky Way).

2007-11-20 00:18:48 · 14 answers · asked by I'm an Atheist 3 in Astronomy & Space

2007-11-20 00:11:54 · 5 answers · asked by Hopeful 1 in Other - Science

I need it for my report in Math..... I'm just confused.......

2007-11-20 00:09:55 · 3 answers · asked by Anonymous in Mathematics

The current gummy book binders for paperbacks and hardcovers make it so that a book needs to be held open with both hands. The book is always wanting to close itself.

Also, books take on the shape of a gull wing where the pages curve away from the reader. We are oftentimes reading a continuously curving surface. The eyes need to focus at different depths in a short amount of time.

So, I was wondering if it's possible to make book binders with nanotechnology such that each page can literally be opened at 90 degrees. Instead of one big hinge, if you will, there would be say 150 nano-hinges for a 300 page book.

2007-11-20 00:08:57 · 4 answers · asked by Question Monster 4 in Other - Science

Strontium(Sr) and barium (Ba) both are group ii metal and lie below Calcium. As for metal we know that reactivity increases as we go down in the same group but calcium is placed higher in the reactivity series as in http://en.wikipedia.org/wiki/Reactivity_series
WHY

2007-11-20 00:07:56 · 1 answers · asked by Anonymous in Chemistry

2007-11-20 00:05:31 · 3 answers · asked by Anonymous in Earth Sciences & Geology