Science & Mathematics - 6 November 2007

A dentist's drill starts from rest. after 3.2 seconds of constant angular acceleration, it turns at a rate of 2.51 * 10^4 rev/min.

1) find the drill's angular acceleration.
2) determine the angle (in radians) through which the drill rotates during this period.

2007-11-06 06:43:27 · 1 answers · asked by Captain Whiskerboy Litterbox 3 in Physics

Volume of cone=8in^3
SA of a cone is pi*radius*sqr(radius^2+height^2)
Volume of a cone= 1/3(pi)(radius^2)(height)

2007-11-06 06:42:13 · 2 answers · asked by cowdude2552 1 in Mathematics

Like the global population. I can't find a website with the info.

2007-11-06 06:41:41 · 2 answers · asked by Anonymous in Zoology

2007-11-06 06:39:25 · 1 answers · asked by Anonymous in Physics

2007-11-06 06:35:59 · 4 answers · asked by Emperor Insania Says Bye! 5 in Physics

2007-11-06 06:35:28 · 2 answers · asked by Anonymous in Zoology

2 questions - please help.


when acids are mixed with alkalis they become?/
acids react with carbonates to produce?

2007-11-06 06:35:24 · 5 answers · asked by Anonymous in Chemistry

I was amazed with that when I first saw someone mention it here, but I have a new computer and no longer have the coordinates. If you have seen this thing, you will know what I am talking about. I can't find it. Coordinates, please?

2007-11-06 06:28:14 · 1 answers · asked by Brant 7 in Astronomy & Space

a mchine that changes only the direction of a force has a mechanical advantage of

a. 10
b.5
c.2
d.1

2007-11-06 06:27:54 · 3 answers · asked by Anonymous in Physics

Instead of taking a swab from inside your own mouth but instead from inside your cat's mouth and sent it off for the results. What would be the outcome, would anything come back?
Would the company be shocked at what they found and send round big white vans with people in bio-suits like they did in ET to take you away?

2007-11-06 06:25:58 · 4 answers · asked by Anonymous in Biology

What physics will be involved in my ascension into the spirit realm? Will gravity play a role?

Are his noodley appendages exempt from physics?

2007-11-06 06:24:32 · 9 answers · asked by Anonymous in Physics

Okay, I am checking into a hotel for corporate training. We will be assigned roomates. Your roomate will be determined by when you check in. For example:
Male 1 is Male 2's roomate
Male 3 is Male 4's roomate
Female 1 is Female 2's Roomate
Male 33 is Male 34's roomate... and so on.

Is is true that:
a) There is a 50% chance that there will be an odd number of people and a 50% chance that there will be an even number of people?

b)If there is an odd number of people and the rooms definitely only accomodate 2 people, that there will be someone rooming by themself?

and most importantly

c) if I make sure that I check in AFTER everyone else, that assuming a and b are true, there is a 50 % chance that I get my own room (as long as I am the LAST person to check in)

2007-11-06 06:22:34 · 14 answers · asked by rickpetralia 1 in Mathematics

The Question is: Find the tangent equation when x = 0 for y = [x+ (x+x^1/2)^1/2]^1/2. So, basically i just need to know how to find the derivative of this function with the chain rule so i can get the slope of the tangent line.

2007-11-06 06:21:00 · 6 answers · asked by M4tr!x 2 in Mathematics

2007-11-06 06:17:52 · 5 answers · asked by I'/\/\AZILLA2 3 in Physics

a distance of 12 cm into the tree's trunk. What was the force exerted on the bullet in bringing it to rest? If you could show me how you got the answer so I can understand it for a similar problem next time I'd appreciate it. Thanks

2007-11-06 06:14:34 · 2 answers · asked by Anonymous in Physics

for images, check www.spaceweather.com

2007-11-06 06:13:40 · 6 answers · asked by odyssey131 1 in Astronomy & Space

Find an equation for each ellipse below. Then, graph the equation.

(1) Foci at (1, 2) and (-3, 2); vertex at (-4, 2)

(2) Center at (1, 2); vertex at (1, 4) and passing through the point (2, 2)

2007-11-06 06:13:35 · 2 answers · asked by Anonymous in Mathematics

When quicklime slakes in the atmosphere, a mixture of calcium carbonate, CaCO3 and calcium hydroxide Ca(OH)2,
forms because of the reaction of quicklime with carbon dioxide and water in the atmosphere. This is the time consuming reaction that occurs when mortar sets. Write balanced equations that represent the setting of mortar

2007-11-06 06:11:10 · 2 answers · asked by bocabrunette714 1 in Chemistry

Silver carbonate, Ag2CO3, is a sparingly soluble solid. A saturated solution is prepared by placing solid silver carbonate in pure water in which the silver ion concentration, [Ag1+], was found to be 1.02E-04 M.

a. What is the concentration of carbonate ions, [CO32-]?

b. What is the molar solubility of silver carbonate, Ag2CO3?

c. What is the solubility product constant, Ksp, for silver carbonate, Ag2CO3?

2007-11-06 06:10:12 · 3 answers · asked by Nick P 1 in Chemistry

2007-11-06 06:08:23 · 2 answers · asked by Learner in da makin 1 in Mathematics

Each of the following processes is a likely change in a redox reaction.?
Label the chemical changes as an oxidation process, a reduction process or neither.

ClO2- --> ClO3- ____________
Co3+ --> Co2+ ____________
(Cr2O7)2- --> Cr3+ ____________
SO3 --> (SO4)2- ____________
H+ --> H2 _____________

thanks:)

2007-11-06 06:08:13 · 3 answers · asked by maybe714 1 in Chemistry

2007-11-06 06:07:35 · 17 answers · asked by Snow Princess 2 in Engineering

This is the whole question.

What are some difficulties faced by a cell as it grows larger?

Can someone explain me thorougly? and please if u can include analogy to help me understand better. Thanks a lot

2007-11-06 06:06:55 · 4 answers · asked by BollyStar 1 in Biology

2007-11-06 06:05:44 · 4 answers · asked by ? 1 in Earth Sciences & Geology

Then how come it's so round.. ?

(Minus the Geographic Features, like mountains, and holes, and such...)
Like, From space you can see Earth as a round planet, Like all of the other planets.
So, If the World/Universe was made up by the clash of a bunch of rocks, how on Earth (haha) did these planets, like our own, develop as a sphere shape... ?

2007-11-06 06:00:10 · 14 answers · asked by pj! 3 in Astronomy & Space

and alligator. Will the lion really win?

2007-11-06 05:58:46 · 7 answers · asked by Virgo27 6 in Zoology

and what is the balanced symbol equation of it in combustion??

2007-11-06 05:55:58 · 3 answers · asked by x-trang-x 1 in Chemistry

What is the value of the expression:
(1+1/2)(1+1/3)(1+1/4)...
(1+1/2004)(1+1/2005)

the dots just mean it has skipped the brackets in between.
calculators may not be used for this question.

Any help on how to solve this question? The answer is 2003 but I'd like to know how to work it out.

2007-11-06 05:53:23 · 5 answers · asked by Anonymous in Mathematics

Can someone help me out here. I can't seem to find any step by step instructions on how to do this.

I am not familiar feasible sets at all..so need a pretty basic explanation..not looking for an answer here.

Its constraints are:
3x+2y>=24
x+2y<=20
x<=6
x>=0, y>=0

2007-11-06 05:49:44 · 2 answers · asked by thatsme:) 1 in Mathematics

according to this article

http://encarta.msn.com/encyclopedia_761569048/Skin.html

cancers of which kind of epidermis cells are more dangerous? Why?

please help? i've been looking for this answer for 2 days! >_<

2007-11-06 05:49:38 · 2 answers · asked by sand_illusions 4 in Biology