Science & Mathematics - 16 October 2007

Can somebody give me feedback on the effects of these devices in the output voltage and eventually on the electrical equipment. I'm a little bit worried because these saving devices reduces the output voltage. In an electrical system like ours, the operating voltage is 220V. But once power is channelled to the device, sometimes voltage drops to 200V during peak hours.

2007-10-16 02:13:12 · 2 answers · asked by pacfan 1 in Engineering

solve and graph

2007-10-16 02:12:59 · 10 answers · asked by natasha r 1 in Mathematics

2007-10-16 02:05:57 · 9 answers · asked by TABYS 6 in Weather

2007-10-16 02:04:29 · 2 answers · asked by Anonymous in Chemistry

Devise and execute a problem solving strategy that will yield a reasonable physical explanation for how a star is able to resist collapsing under its own gravitational attraction

2007-10-16 02:04:08 · 1 answers · asked by ? 1 in Physics

The isoelectri point for normal hemoglobin is 6.9. The electrophoresis buffer for this experiment has a pH of 9.2.

a. What charge does the hemoglobin molecule have at pH 9.2? Explain

b. How would hemoglobin migrate if the electrophoresis buffer had a pH of 5.0?

c. How would normal hemoglobin migrate if the electrophoresis buffer had a pH of 6.9? Explain.

2007-10-16 02:02:32 · 2 answers · asked by asdf1234 2 in Chemistry

I know that DNA is a crazy thing to understand fully, because it's so complicated and intriguing. I've noticed that I'm quite attracted to white women rather than blacks (even though there are lots of black beauties out there!), just as my best friend (girl) is attracted to white guys. I've always had this, from an early age, and I can't understand it. Is there a gene that pre-determines inter-racial attraction towards a specific "race"?

2007-10-16 01:58:30 · 4 answers · asked by Kool J. B. 4 in Biology

http://en.wikipedia.org/wiki/William_Rowan_Hamilton

So is this what people are talking about when they say that time is NOT the fourth dimension? I believe the popular conception is that time IS the 4th dimension. But when I was in college, I heard people say it wasn't. Are there any equations that you know of that explain time? Was Hamilton onto anything?

2007-10-16 01:52:48 · 2 answers · asked by searching_please 6 in Astronomy & Space

2007-10-16 01:48:56 · 8 answers · asked by fredrick o 1 in Geography

A) Sensor
B) Feedback Loop
C) Changer
D) Responder
E) Effector

2007-10-16 01:45:11 · 3 answers · asked by Corey w 1 in Physics

Could I be pregnant?

2007-10-16 01:40:22 · 6 answers · asked by Anonymous in Geography

2007-10-16 01:38:50 · 3 answers · asked by reza_hemmatdj 1 in Engineering

Is it true that urban pigeons host more pathogens and parasites than rats?

2007-10-16 01:29:30 · 8 answers · asked by Anonymous in Zoology

Your thoughts please.

2007-10-16 01:23:19 · 15 answers · asked by Anonymous in Astronomy & Space

When 4g of sodium hydroxide (NaOH) was dissolved in 150g of water a value of 10.0oC was obtained for ΔT.

Calculate the heat (calories) produced by the solution of 4 g of NaOH.

2007-10-16 01:16:48 · 1 answers · asked by jagar 2 in Chemistry

2007-10-16 01:07:15 · 6 answers · asked by morgan g 1 in Geography

(a) be eliminated from the body slowly
(b) be fissionable
(c) be deposited into fat tissue
(d) have short half-lives

2007-10-16 01:05:37 · 2 answers · asked by Jenn S 2 in Medicine

2007-10-16 01:03:24 · 8 answers · asked by rampageenergyman 2 in Astronomy & Space

the area between the graph line and the horozontal axis on a(n) ____ - time graph represents the change of velocity of the object in a given time interval

2007-10-16 00:44:31 · 4 answers · asked by inspectorlocohombre 2 in Physics

A amusement park ride consists of a rotating circular platform 11.8 m in diameter from which 10 kg seats are suspended at the end of 1.18 m massless chains. When the system rotates, the chains make an angle of 38.1 degrees with the vertical. The acceleration of gravity is 9.8 m/s^2.

What is the speed of each seat? Answer in units of m/s.

Picture: http://geocities.com/grouchy187/figure.bmp

[I did this but I aint sure if its done right. Horizontal force equals mg tan of angle. This is balanced with centripetal force so mv^2/r = mg tan (angle).

So v = sqrt of (g*r*tan (angle))
v = 6.733251157 m/s (don't need sig. figures)

So does this look right to anyone else? Thx.]

2007-10-16 00:41:23 · 3 answers · asked by grouchy187 2 in Physics

2007-10-16 00:36:58 · 3 answers · asked by mjpyork 1 in Engineering

2007-10-16 00:33:27 · 17 answers · asked by Jimbo 2 in Geography

uses of bigas, applicability. cost effectivity

2007-10-16 00:31:55 · 1 answers · asked by Rehema H 1 in Biology

is it because the particles of the gas are far from each other, which will make it hard for the heat to transfer?!.

if its correct please give a more correct answer,
and if its not. tell me what,

=D

2007-10-16 00:25:45 · 8 answers · asked by Anonymous in Earth Sciences & Geology

2007-10-16 00:23:02 · 4 answers · asked by Anonymous in Astronomy & Space

A best answer will be voted for!

Cheers

2007-10-16 00:15:04 · 7 answers · asked by Ginga-Ninja 1 in Mathematics

does it exists?

2007-10-16 00:07:38 · 3 answers · asked by Chris 2 in Engineering

2007-10-16 00:03:51 · 1 answers · asked by Anonymous in Medicine

Ive been practicing Telekinesis for a few days now and i do believe it can work

I can feel the energy between the palms of my hands
Ive been practicing on a psi wheel but cant get the paper to move
how can i get the paper to spin? i feel the energy just cant transfer it =(

2007-10-16 00:03:22 · 11 answers · asked by BOB 1 in Parapsychology

A lof insulation is a fibre roll that traps in heat inside the house.
PUHLEASE EXPLAIN WHY

2007-10-16 00:02:55 · 5 answers · asked by Anonymous in Engineering