Science & Mathematics - 12 December 2007

2007-12-12 12:56:27 · 2 answers · asked by Anonymous in Chemistry

thanks for your help

2007-12-12 12:55:30 · 1 answers · asked by Anonymous in Earth Sciences & Geology

I'm writing a trebuchet report for Physics and I need to find the potential energy and kinetic energy of the trebuchet (the kinetic energy right when my projectile leaves the sling).

Also I need to answer the questions:

If all potential energy is used, and projectile launched at 45 degree angle, what would be max range?

What is the mechanical advantage of the trebuchet?

If you can help, thank you!

2007-12-12 12:54:53 · 2 answers · asked by Rennix 2 in Physics

A couple has two girls and no sons. They want to have six kids. What is the probability of having all girls? I think the answer is 1/6, but I don't know how they got that answer.

2007-12-12 12:52:36 · 4 answers · asked by Lilly B 2 in Other - Science

Use a suitable change of variable to find the area of the region R bounded by the graphs of y=x^2, y=4x^2, y=sqr(x), y=(1/2)sqr(x)

2007-12-12 12:44:45 · 1 answers · asked by azulita 3 in Mathematics

The sequence frac(sqrt(n)), n = 1, 2, 3....., where frac(u) means the fractionary part of u.

Thank you

2007-12-12 12:43:15 · 1 answers · asked by Adrian 1 in Mathematics

Could it be possible sightings in the desert could just be an alien ghost ship, i mean the aliens came to earth for a reason and i bet they never had a chance to finish there mission before they crashed and now they fly around Roswell in a ghostly U.F.O. looking to complete the mission they never finished in there life?

2007-12-12 12:41:33 · 12 answers · asked by Anonymous in Paranormal Phenomena

Thanks

2007-12-12 12:41:01 · 2 answers · asked by Anonymous in Geography

So, supposedly the ice in Greenland is starting to melt.
If you go to Google Earth and click on satellite image, then zoom in on Greenland, you will see something quite inexplicable emerging from under the ice.
They say that it is 50 miles long.

What in the heck do you think it is???

2007-12-12 12:38:22 · 4 answers · asked by Anonymous in Earth Sciences & Geology

2007-12-12 12:36:56 · 5 answers · asked by Anonymous in Astronomy & Space

If I use a charge controller for a 12v battery that limits the voltage and Amps would my battery die if I am using more volts and amps than the charge controller is allowing to run into the battery? Basically I want to run applications of the battery through an inverter but the applications use a lot of volts and amps. I want to charge the battery with a simple generator that creates plenty of energy but I have been told just running it into the battery would damage it so I need a charge controller that limits the voltage to 14-15 volts and 20amps but my applications use more than that. So would my battery go dead or would it take more energy the lower the battery level is?

2007-12-12 12:33:18 · 3 answers · asked by Cassidy A 1 in Engineering

i really need to know !!!!!!!!!!!!!!!!!!!!!!!!!!!!!

2007-12-12 12:28:34 · 10 answers · asked by Anonymous in Astronomy & Space

OK. SO, Ff= (mu)Fn (also known as the FUN equation-as likely as not!) anyways, i know the Fn, and i need to find the frictional force. Then there is this EVIL coefficient of friction. and this is where i crumble. so i have the coefficient of static friction and the coefficient of kinetic friction (this is all about a block of wood sliding across a table by the way) and now i need to know the frictional force. BUT to find the frictional force, i need the coefficient of Friction. HOw do i find this?? do i use the kinetic coefficient? What does this mean?? PLEASE HELP ME. thank you very much

2007-12-12 12:28:16 · 2 answers · asked by Anonymous in Physics

2007-12-12 12:26:18 · 2 answers · asked by xoacousticox 2 in Earth Sciences & Geology

2007-12-12 12:24:56 · 5 answers · asked by Mishelle B 1 in Mathematics

And what is the name of the family? How do they survive?

2007-12-12 12:22:10 · 4 answers · asked by Anonymous in Zoology

2007-12-12 12:21:17 · 5 answers · asked by telset101 3 in Astronomy & Space

2007-12-12 12:20:53 · 15 answers · asked by Elaine 2 in Medicine

I need it for a project. It would really help.

2007-12-12 12:20:16 · 2 answers · asked by Anonymous in Geography

Refresh my mind please

2007-12-12 12:18:28 · 8 answers · asked by I wish I could......... 4 in Mathematics

2007-12-12 12:17:50 · 6 answers · asked by Anonymous in Mathematics

2007-12-12 12:15:08 · 2 answers · asked by Allie U 1 in Earth Sciences & Geology

Solve 2^(3x - 6) = 8

2^(3*3 - 6) = 8

2^(9-6) = 8

2^(9-6) = 8 is equivalent to 2^(3)



My teacher said i solved this through the process of elimination and asked how to solve if I didn't know x = 3.

What does she mean - please explain .

2007-12-12 12:14:28 · 7 answers · asked by Jaz 'ma' Taz 2 in Mathematics

2007-12-12 12:11:59 · 7 answers · asked by gingerpie13 2 in Mathematics

I need at least three for science. Thank you!

2007-12-12 12:07:07 · 14 answers · asked by julianazhang921 1 in Astronomy & Space

2007-12-12 12:06:01 · 12 answers · asked by Erick 4 in Weather

And to all the sarcastic people, who are going to say "because your able to use your eyes" thats not what i mean, when you look into a mirror how does it give you a image of you back, grrr..kinda hard to say but what makes a mirror give a reflection of the enviroment, like if i stand in front of my bathroom mirror why do i see myself? When i look at the wall i dont see my reflection? so anybody know this and thanks.

2007-12-12 12:05:33 · 5 answers · asked by Anonymous in Physics

please explain
hint- you have to use "trial and error"

162y^5 - 32y

and

x^4 - 50x^2 + 32y

2007-12-12 12:03:15 · 5 answers · asked by thiswasjustforphysics 3 in Mathematics

2007-12-12 12:02:15 · 5 answers · asked by Crystle S 1 in Botany

Find net force on the ring..?
There are four forces acting on a ring.
Force A is 20 lbs at an angle of 20 degree relative to the horizontal.
Force B is 20 lbs at an angle of 50 degrees relative to the horizontal.
Force C is 15 lbs at an angle of 30 degrees below the horizontal.
Force D is 30 lbs at an angle of 70 degrees below the horizontal.
What is the net force on the ring?
Image kinda looks like this:
http://i76.photobucket.com/albums/j4/pxg...

2007-12-12 12:01:44 · 1 answers · asked by Anonymous in Physics