Science & Mathematics - 25 November 2007

In exam hall pls!

2007-11-25 19:23:32 · 20 answers · asked by Mally 2 in Mathematics

Find its radius and altitude.

2007-11-25 19:16:36 · 3 answers · asked by Anonymous in Mathematics

2007-11-25 19:13:56 · 9 answers · asked by Anonymous in Mathematics

When an electron moves with a certain de Broglie wavelength, does the electron shake back and forth or up and down at that wavelength?

2007-11-25 19:06:48 · 4 answers · asked by Nomad 1 in Physics

xxx
*xx
= xxxx
+xxxx0
=xxxxx

Using only 2,3,5,7 what is the final answer

2007-11-25 18:50:47 · 1 answers · asked by Anonymous in Mathematics

To come back to my question of yesterday, here is a page that claim the hydrosonic pump can output over 150% of the input energy. There is even some examples running for a year now in Georgia USA. Is this some scam or can it be real according to physics?
http://www.alternativescience.com/over-unity.htm

2007-11-25 18:49:21 · 4 answers · asked by Jan 3 in Physics

2007-11-25 18:49:04 · 5 answers · asked by KrishanRam(Jitendra k) 3 in Physics

If U = 3.85 x 10^-7
q1 = 5.0x10^-9
q2 = -3.0x10^-9
r12 = 0.35m

What is the electric potiential at a point midway b/w the charged particles?

I Just want to know how to do the method in solving the problem. An numberical answer is not required.

2007-11-25 18:46:18 · 2 answers · asked by Anonymous in Physics

Equation CaO+H2O-->Ca(OH)2
Question: how much calcium hydroxide will be produced when 10g of calcium oxide reacts with 3g of water?

I belive rather than having to covert from grams to moles there is an alternate method:
CaO+H2O-->Ca(OH)2
56.08g : 18.01 g
10.00g : Xg now I am unsure what to do from here!
12.34g is the final answer
Any help on this alternate method is appreciated

2007-11-25 18:42:44 · 2 answers · asked by Gideon 1 in Chemistry

http://s141.photobucket.com/albums/r77/rocketllamafootie/?action=view¤t=combines.jpg

2007-11-25 18:34:21 · 1 answers · asked by Anonymous in Mathematics

2007-11-25 18:33:54 · 4 answers · asked by hell_raiser 1 in Medicine

The pages in a book are numbered starting with 1. The book has 250 pages. How many digits did the printer use in numbering the pages of the book?

a) 640
b) 642
c) 320
d) 321

2007-11-25 18:29:00 · 8 answers · asked by tommygurl48670 2 in Mathematics

Once the object has gained a certain velocity from any of the current methods currently being used, are there materials in space itself that the object could gather and somehow convert into energy for further propulsion to either increase speed or store it to be used later? Anyone aware of any ideas along this line?

2007-11-25 18:28:51 · 3 answers · asked by bush l 1 in Physics

2. Calculate the density of air in g/L, assuming air is 20.0% O2 and 80.0% N2,at the temperature and the pressure of the laboratory.

Knowns and some of the work done:
Barometric Pressure. 760.3mmHg
1.00039atm.

Temp: 297.7K

Ptotal=PO2+PN2

1.00039x.2=.200079 atm O2
1.00039x.8=.800316 atm N2

R=.08206

2007-11-25 18:28:35 · 2 answers · asked by jeir35 2 in Chemistry

A particle with charge +q is at the origin. A particle with -2q us at x=2.00m on the x-axis.
a) What finite values of x is the elextric field zero?
b) What finite values of x is the electric potential zero?

2007-11-25 18:27:14 · 2 answers · asked by Anonymous in Physics

will we be traveling to other planets to live there? i think it would be pretty interesting to see this, but would like to know other peoples opinions. thanks

2007-11-25 18:26:44 · 7 answers · asked by Anonymous in Astronomy & Space

I think I'm gonna go nuts. I'm trying to integrate this but always getting the wrong answer. I've done it 5 times already. Ok here it is:

Double-integrate this from 0 to 0.4 (for both x and y):

2/5(2x+3y)dxdy

The answer's supposed to be 0.64 but I keep getting 0.128. If you got the right answer, can you please walk me through every step of the integration process in detail? I'll give best answer! :)

2007-11-25 18:24:43 · 2 answers · asked by Areeb B 1 in Mathematics

Is this some type of hint----> (1000pa=1 kpa)

2007-11-25 18:22:21 · 3 answers · asked by Anonymous in Chemistry

It is circumscribed about a right circular cylinder of base radius 6 cm. and altitude 14 cm. Find the lateral area of the cone.

2007-11-25 18:20:45 · 1 answers · asked by exilimo 1 in Mathematics

Lately I have seen raccoons get really close to people because the have been feeding them. Is that bad? Are you taking a big risk in trying to pet one?? Are they as dangerous as they are perceived?

2007-11-25 18:18:39 · 7 answers · asked by Anonymous in Zoology

It was surmounted by a right circular cone of the same diameter and altitude 3 m. Find the total volume of the silo.

2007-11-25 18:18:00 · 1 answers · asked by exilimo 1 in Mathematics

please sumone help me

2007-11-25 18:16:36 · 7 answers · asked by Anonymous in Mathematics

now imagine theres a point A at height of 40 metres . now from that point a thin non elastic lace (thread) starts to materialize(magically orignate) and run down and hits the ground due to gravity. the lace keeps on appearing and its like endless. now when it appears at point A its velocity is zero but it gets jerked up to a velocity . now what would be the vellocity of the lace when hits the ground after runnin down 40 metres. AIR RESISTANCE IS TAKEN AS ZERO. here gravity is acting on the vertical length of the lace which is forty metres. according to me the lace can have a maximum velocity of only 20 m/s. which is less than 28 m/s when u drop something from a height of 40 metres..

now for 1000 metres of lace (thread ) to run down originating from that point A, how long will it take..>? hope ppl get my question

2007-11-25 18:15:21 · 2 answers · asked by balaji.k 2 in Physics

Easily and smoothly.I have to take exam tommorow

2007-11-25 18:12:33 · 1 answers · asked by Anonymous in Mathematics

using words they would understand

2007-11-25 18:12:09 · 8 answers · asked by Anonymous in Physics

Calc I, no need to get extreemly complicated

2007-11-25 18:09:56 · 1 answers · asked by Firm_Cross 2 in Mathematics

Solve the following equations...

^=powerof

1. 8x^5-6x^2+12x^3-9=0

2. x^3=9x

3. 2x^4+5x^3+4x^2+5x=-2


If you don't want to do all, can you do one and show a relatively detailed process of how you figured it out. Thanks! I really need to figure these out soon.

2007-11-25 18:07:50 · 5 answers · asked by Anonymous in Mathematics

...advanced display systems, extensive communications systems (including satellite data links), and intelligence equipement used in air and surface surveillance operations?
Anything u might think is needed to study for these would be very helpful. Thanx

2007-11-25 17:55:58 · 1 answers · asked by Anonymous in Mathematics

Hey. This is ma h.w but i'm not CHEATING! We are allowed to use this site to find the answers. Here are my questions...
1.How many different species of insects are there in the world?
2. How long does a catipillar stay in its cacoon before it turns into a butterfly?
3. What are the four distinct phases in the life span of a fly?
4. (i know number four)
5.What are "no-see-ums"?
6. Is there a difference between an insect and a bug?
7. Which is the fastest insect?
8. Which insect lives the longest?
9. Which insect is the most poinsonous?
10. Which insect is the largest in the world?
Thanyou! Hey everyone at oc!

2007-11-25 17:54:58 · 10 answers · asked by Anonymous in Zoology

2007-11-25 17:50:32 · 3 answers · asked by diversity 1 in Mathematics