Science & Mathematics - 26 November 2007

2007-11-26 16:07:23 · 11 answers · asked by Mercury 2010 7 in Astronomy & Space

2007-11-26 16:06:50 · 2 answers · asked by Anonymous in Medicine

More specifically, is there ever a case where you could use an indoor cord outside without fear of trouble? (If the only difference is the grounding wire, could one use a short interior extension cord to connect a set of miniature lights... .2amps... outside. Keep in mind that the cord is short, plugged into a GFCI, significantly more robust than the mini lights' cord itself, and has only one ...also ungrounded... set of lights plugged into it?)

I'm certainly not advocating doing this, I'm just wondering what it is I'm missing. Thanks!

2007-11-26 16:05:15 · 10 answers · asked by BioRyan 2 in Engineering

1) What is the frequency, in hertz, that corresponds to each of the following periods?
a) 0.10s? __Hz
b) 4s? __Hz
c) 1/40s? __Hz

2)A skipper on a boat notices wave crests passing his anchor chain every 5 s. He estimates the distance between wave crests to be 15 m. He also correctly estimates the speed of the waves. What is this speed? __m/s

3)A mosquito flaps its wings 640 vibrations per second, which produces the annoying 640 Hz buzz. The speed of sound is 340 m/s. How far does the sound travel between wing beats? In other words, find the wavelength of the mosquito's sound. ____m

4)What is the period, in seconds, that corresponds to each of the following frequencies?
a) 9Hz ___s
b) 0.30Hz ___s
c) 60Hz ___s

5)Radio waves travel at the speed of light: 300000 km/s. What is the wavelength of radio waves received at 700 MHz on your radio dial? ___m

2007-11-26 16:03:52 · 2 answers · asked by TheLostOne 3 in Physics

My last question i asked got a very nice response that helped me alot with the other questions like it, for this one Domains and ranges have always eluded me, just something I haven't been able to figure out, this here is a very basic one but i still can't 100% figure it out! On a graphing calc I can see what sqrt(x) is, but how do I figure out the domain and range of that and the inverse of it? Any help would be mucho appreciated!

The full question is:

let f(x) = sqrt(x)
Sketch F and F-1(inverse) on the same coordinate plane
Stage the Df(Domain) and Rf(range)

2007-11-26 16:00:26 · 2 answers · asked by Anonymous in Mathematics

skilled workers for boilers and what part of boiler they work for?

2007-11-26 15:58:22 · 3 answers · asked by rheden m 1 in Engineering

2007-11-26 15:56:13 · 6 answers · asked by Anonymous in Earth Sciences & Geology

7x+2y= -1
3x-4y=19
answer: 10x + -2y=18


5x-3y=16
4x+5y= -2
answer: 9x+ -2y= 14


4x+3y=9
3x+4y= 12
answer: 7x+7y=21



3x-5y=7
5x-2y= -1
answer: 8x-3y=6

2007-11-26 15:55:19 · 9 answers · asked by ALESANA 7 in Mathematics

2007-11-26 15:55:08 · 3 answers · asked by Anonymous in Earth Sciences & Geology

The approximate volume of the granite monolith known as El Capitan in Yosemite National Park is about 10^8 m^3. What is its approximate mass?

2007-11-26 15:51:55 · 5 answers · asked by Callie 1 in Physics

Solve for x: 11/8 = 8/x+3
a) 31/11
b) 11/31
c) 97/11
d) 31

and...

Solve the proportion: 2/k = 16/4
a) k=1/2
b) k=1/4
c) k=8
d) k=2

2007-11-26 15:47:51 · 6 answers · asked by Jessica 1 in Mathematics

hot H20 or cold H20 Freeze faster

2007-11-26 15:45:44 · 6 answers · asked by Julie W 1 in Chemistry

Prove the identity using other trigonometric identities and substitutions. A calculator may not be used as a proof

2007-11-26 15:44:39 · 3 answers · asked by Anonymous in Mathematics

(1) inbred organism
(2) hybrid
(3) wild type
(4) F2 generation

2007-11-26 15:40:35 · 4 answers · asked by Anonymous in Biology

(1) blood type
(2) height
(3) sickle-cell
(4) cystic fibrosis

2007-11-26 15:36:03 · 2 answers · asked by tnawee 1 in Biology

what new experimental technology are they working on now at area 51

2007-11-26 15:36:03 · 7 answers · asked by Anonymous in Astronomy & Space

2007-11-26 15:33:20 · 5 answers · asked by ANITA g 1 in Mathematics

List steps and explain what you're doing please, thanks.

2007-11-26 15:32:02 · 2 answers · asked by bsubroncos20 1 in Mathematics

is 11/-3 the same thing as -11/3

and why?

2007-11-26 15:31:32 · 8 answers · asked by jen 2 in Mathematics

When an automobile moves with constant velocity, the power developed is used to overcome the frictional forces exerted by the air and the road. If the engine develops 30 hp, what total frictional force acts on the car at 120 mph?


1hp = 746W
1mile-1609m
work=force*distance
power= work/time

30hp= 22380w
120mph= 53.6448m/s
I'm really not sure where to go from there, you need to end up with force which is Newtons, dont you need a mass in kg to for that?

2007-11-26 15:30:32 · 2 answers · asked by Katie E 2 in Physics

common salt is spread on roads to prevent icing in the wintertime. The cost of salt is $1/kg. A rich new source of CaCl2 was discovered and mined at $1.4/kg. Which salt is more cost-effective?

2007-11-26 15:30:21 · 2 answers · asked by eleven thousand dollars 2 in Earth Sciences & Geology

2007-11-26 15:28:42 · 18 answers · asked by ANITA g 1 in Mathematics

What is the difference between a permanent magnet and an electromagnet?
What is the relationship between the direction of magnetic field generated and the electric field?
How can you increase the magnetic field generated?

2007-11-26 15:26:32 · 5 answers · asked by Anonymous in Physics

OK,

h(x)=3x62+24x-5

How would I convert this to vertex form? Show all steps!

I completely forgot:-(

THANKS

2007-11-26 15:26:25 · 2 answers · asked by Anonymous in Mathematics

2007-11-26 15:25:40 · 2 answers · asked by jokersrage2 1 in Mathematics

trait. the man sues his wife for divorce on grounds of infidelity. can gentics profive evidence supporting his case? pleaseee help!

2007-11-26 15:24:41 · 5 answers · asked by Anonymous in Biology

Of the five places listed below it would be easiest to launch a spacecraft from the earth from:

a) New Mexico (south over Mexico)
b) California (north over the Pacific Ocean)
c) Florida (east over the Atlantic Ocean)
d) Moscow (east over Siberia)

The first trip to the moon was, in fact, launched from (see above):

a) b) c) d) e)

A century ago Jules Verne thought the journey to the moon would commence from:

a) b) c) d) e)

2007-11-26 15:24:29 · 1 answers · asked by ? 6 in Physics

Is the black hole really a hole in space?

And where does all the stuff it sucks go to?I mean since it's a hole it has got to have a bottom and it has to have a limit on how much stuff it can contain right?So where does all that stuff it sucks go to?

And also is a black hole a 2 dimentional thing or a three dimentional thing? a hole only has 2 dimentions right? O_o

This black hole sh_t has really got me..

2007-11-26 15:23:56 · 9 answers · asked by Anonymous in Astronomy & Space

2007-11-26 15:22:49 · 2 answers · asked by jokersrage2 1 in Mathematics

what is the power consumed by a lift to take 10 persons three floors down ?

2007-11-26 15:22:43 · 4 answers · asked by Sai 1 in Engineering