Science & Mathematics - 22 October 2007

A grinding wheel is in the form of a uniform solid disk of radius 6.33 cm and mass 1.3 kg. It starts from rest and accelerates uniformly under the action of the constant torque of 0.793 Nm that the motor exerts on the wheel.
-How long does the wheel take to reach its final speed of 1590 rev/min? Answer in s.
b) Through how many revolutions does it turn while accelerating? Answer in rev.
Please help!!!! THANKSS!!!

2007-10-22 09:26:24 · 1 answers · asked by Ron108 1 in Physics

The first law of thermodynamics seems to conflict with what we know about ourselves. For example, after strenuous exercise we run out of "energy". We must eat to replenish our energystores. Where has that energy gone? Where has that energy gone? What form has it taken?

2007-10-22 09:24:25 · 1 answers · asked by Anonymous in Biology

I don't understand this at all, so when you answer, answer STEP by STEP. p.s. / means divide

3a+ 1 / 5=2

2007-10-22 09:23:12 · 2 answers · asked by Anonymous in Mathematics

its mole day tommorow and i neeed to know!

2007-10-22 09:21:14 · 11 answers · asked by cantwaittogetout 1 in Chemistry

Hypotonic slution makes a cell lose water by osmosis causeing the cell to shrink!

2007-10-22 09:16:59 · 0 answers · asked by Anonymous in Biology

2007-10-22 09:14:38 · 3 answers · asked by goku 1 in Engineering

2007-10-22 09:14:37 · 4 answers · asked by Anonymous in Mathematics

{5 -1 -1 -8 : 5 }
{10 -2 4 2 : 8}


and the second one is :

{ 1 -2 1 -4 : -3}
{ 1 3 7 2 : 18}
{ 1 -12 -11 -16 : -37}


thanks a million!!! Im sooo stuck :(

2007-10-22 09:13:42 · 1 answers · asked by Anonymous in Mathematics

I made this machine using stepper motors witch works on X and Y axis what kind of progroming languge and i/o devoice do I need to learn about in order to make it work ?

2007-10-22 09:10:46 · 2 answers · asked by Cheetah 1 in Engineering

Find measure of angle RSU if
m m and
m
Thanks

2007-10-22 09:10:22 · 6 answers · asked by Anonymous in Mathematics

2007-10-22 09:03:54 · 4 answers · asked by jsuffianaz 2 in Mathematics

I believe that in order for trees and plants to thrive, we need to feed them as much CO2 as possible. I'm looking to put out even more CO2 than Al Gore.

2007-10-22 09:03:50 · 11 answers · asked by Anonymous in Other - Science

here is the equation: C(x)= 0.001x^3 + 0.07x^2 + 19x + 700

the second part is to predict c(27) using the answer from the first part.


i dont know how to do it, please help.

2007-10-22 09:03:48 · 2 answers · asked by Sheee-Luh-Gee 1 in Mathematics

On the website below, go all the way down until you get to the section where it says "Alternate Exterior Angles". See the D and the B on that illustration? what would the relation of them be. Ex. Consecutive Interior, Alternative Exterior (Those are not choices, just examples of others.

Site:
http://www.mathleague.com/help/geometry/angles.htm

2007-10-22 09:03:39 · 2 answers · asked by Anonymous in Mathematics

2007-10-22 09:02:11 · 4 answers · asked by John Ross 1 in Weather

&&& some other questions:

2) how do temp. & moisture content affect condensation & evaporation?

3) what affect does changing the temp. of an air sample have on relative humidity?

4) what affect does changing the air temp. have on the condensation level of a cloud?

2007-10-22 08:56:28 · 2 answers · asked by gyugt76786gf 1 in Weather

are there explanations for these types of things?

2007-10-22 08:56:23 · 20 answers · asked by razawire 4 in Other - Alternative

My friend took 10 of them, and I think she should go to the ER to make sure she's ok. But she says she's fine, so I was wondering how much of it is lethal or how much of it does someone have to take to be harmed? I'm just worried about her

2007-10-22 08:53:57 · 3 answers · asked by -$-Rawker-$- 2 in Medicine

where could I find some clear and complete sketches or technical drawings for centrifugal pumps?
and I'd like some sites on design considerations, as in machining ones..
Thanks!

2007-10-22 08:53:07 · 1 answers · asked by Psycho 3 in Engineering

I'm very creative and always wanted to make my own inventions I am currently going to college for engineering and have some auto cad experience and a good knowledge of electrical workings of products .I would love to work for a new up and coming company. Or any company with new product inventions.If you have any suggetions for a good work place in nj (central) that would be great.

2007-10-22 08:50:06 · 2 answers · asked by tom b 1 in Engineering

Put citations in your discussion for each question

Research the causes of extinction today. Are all, or most, of the causes the result of human intervention?

2007-10-22 08:48:59 · 3 answers · asked by Anonymous in Biology

How many orbitals are contained in the third principal level (n=3) of a given atom?

2007-10-22 08:47:34 · 3 answers · asked by Jay H 1 in Chemistry

These are true or false questions... Does fuels contain kinetic energy?

2007-10-22 08:45:45 · 9 answers · asked by Britt 1 in Chemistry

2007-10-22 08:43:24 · 3 answers · asked by Briana e 1 in Medicine

How do you prove that the quaternion group is not isomorphic to the dihedral group D_4?

the quanternion group looks like this
.........| e a a^2 a^3 b ba ba^2 ba^3
----------------------------- -------------------
e.......| e a a^2 a^3 b ba ba^2 ba^3
a.......| a a^2 a^3 e ba^3 b ba ba^2
a^2...| a^2 a^3 e a ba^2 ba^3 b ba
a^3...| a^3 e a a^2 ba ba^2 ba^3 b
b.......| b ba ba^2 ba^3 a^2 a^3 e a
ba.....| ba ba^2 ba^3 b a a^2 b^3 e
ba^2.| ba^2 ba^3 b ba e a a^2 a^3
ba^3.| ba^3 b ba ba^2 a^3 e a a^2

2007-10-22 08:42:35 · 2 answers · asked by Anonymous in Mathematics

thanx

2007-10-22 08:40:15 · 4 answers · asked by Anonymous in Chemistry

Your answer should include not simply words, but also diagrams and quantitative analysis.

2007-10-22 08:36:34 · 3 answers · asked by Anonymous in Physics

that is built to a scale of 2.5 inches to 14 inches. Round the answer to the nearest tenth of an inch.

2007-10-22 08:36:01 · 2 answers · asked by LOU C 1 in Mathematics

I had a lecture about quadratic functions , then while reading the lecture papers i could see that we may get the value of x by this equation = x= - b/2a .. and y < m> by this equation - d/4a ... then i found this writen in the lecture papers that the vertex of the quadratic function may be considered as following ( -b/2a , d/4a ) the y or m wasnt followed by a negative mark , so which is right .. should it be followed by a negative mark or no ......... ?

2007-10-22 08:35:29 · 3 answers · asked by Anonymous in Mathematics

2007-10-22 08:31:41 · 4 answers · asked by cmiln01 2 in Zoology