Science & Mathematics - 1 November 2006

I recently read an article that said astronauts aboard the ISS had repaired a faulty oxygen generator. Does anyone know how these work?

2006-11-01 14:34:36 · 4 answers · asked by Mike 3 in Astronomy & Space

Energy must be (added to or given off) by the electron when it moves to an orbital closer to the nucleus.

What two assumptions enable us to draw more complex atoms of the pattern of the hydrogen energy levels?

Thanks!

2006-11-01 14:32:41 · 5 answers · asked by =P 2 in Chemistry

How do you find the Spring Constant from these variables?

Mass is .4 kilograms
the distance stretched from rest is .012 meters (also the height)
Use the normal Gravitational constant, 9.81.

Do you find the Gravitational Potential energy first to compensate for the Potential energy elastic or what?

2006-11-01 14:32:09 · 1 answers · asked by elguapo_marco_2008@sbcglobal.net 3 in Physics

2006-11-01 14:32:06 · 14 answers · asked by Anonymous in Physics

Find dy/dx of:

y = (ln(x^2))^(2x+3)

2006-11-01 14:28:19 · 1 answers · asked by Anonymous in Mathematics

A 1900 kg pile driver is used to drive a steel I-beam into the ground. The pile driver falls 4.00 m before coming into contact with the top of the beam, and it drives the beam 11.0 cm farther into the ground before coming to rest. Using energy considerations, calculate the average force the beam exerts on the pile driver while the pile driver is brought to rest.

2006-11-01 14:27:40 · 3 answers · asked by thewordofrashi 2 in Physics

The temperature in central Indiana has been decreasing, but it does keep darting back up every now and then. I've heard many mentions of snow and know that it has lightly touched the north of the state already, but when is it expected in Indianapolis? (Source please)

2006-11-01 14:27:10 · 1 answers · asked by l0st 3 in Weather

You plant a 14 inch Spruce Tree that grows 4 inches per year and an 8 inch hemlock tree that grows 6 inches per year. After how many years will the trees be the same height? How tall will each be?
Please explain this to me, I don't know how to write a linear system with this.
I've come up with 14 + 4x = (dunno) and 8 + 6x(should it be a y?) = (dunno) Anyone help please?

2006-11-01 14:24:40 · 7 answers · asked by tehmonkii 2 in Mathematics

2006-11-01 14:24:11 · 5 answers · asked by Anonymous in Other - Science

plz no dumb answers...and im in gr 9...so no complicated thing...thank you...

2006-11-01 14:24:11 · 6 answers · asked by Anonymous in Other - Science

A 65.0 kg person, running horizontally with a velocity of +3.68 m/s, jumps onto a 12.2 kg sled that is initially at rest.


(a) Ignoring the effects of friction during the collision, find the velocity of the sled and person as they move away.
I got this right with 3.1 m/s

(b) The sled and person coast 30.0 m on level snow before coming to rest. What is the coefficient of kinetic friction between the sled and the snow?

I've gotten different answes... .016, .16, .02, .4.... all those are incorrect.

What am I doing wrong in this problem? I cannot figure it out and it's frustrating me.

2006-11-01 14:23:21 · 3 answers · asked by Confused 1 in Physics

an example of what im asking is: convert 53/913 into word form

2006-11-01 14:22:14 · 4 answers · asked by Emily Z 2 in Mathematics

I thought they were just furry...........

2006-11-01 14:21:12 · 5 answers · asked by Direktor 5 in Zoology

Based on the third law of thermodynamics, we know that perfect crystals at absolute zero have
A. same enthalpy
B. differing deltaA values
C, same entropy
D. same crystal lattices
E. both A and C.
im leaning towards A, or C..or both.
im not sure.
anyone???
any help is greatly appreciated!!! THANKS!

2006-11-01 14:19:23 · 3 answers · asked by Anonymous in Chemistry

2006-11-01 14:19:14 · 5 answers · asked by Anonymous in Biology

stupid HW

2006-11-01 14:19:07 · 5 answers · asked by Steffi T 1 in Physics

2006-11-01 14:18:45 · 2 answers · asked by Anonymous in Botany

2006-11-01 14:16:06 · 8 answers · asked by Anonymous in Astronomy & Space

In bench pressing 1.0 x 10^2 kg, a weight lifter applies a force of 1040 N. How large is the upward acceleration of the weights during the lift?

2006-11-01 14:16:04 · 2 answers · asked by yoo whoo 1 in Physics

I have a few Rechargeable AAA and AA cells for use in gadgets. But they discharge too fast after charging for 12 hours!! Is there any way to know they are practically dead already? Discolouration,etc. After charging, they show good voltage on voltmeter.

2006-11-01 14:15:53 · 5 answers · asked by inquisitive 1 in Engineering

A tree casts a shadow that measures 5 m. At the same time, a meter stick casts a shadow that is 0.4 m long. How tall is the tree?

2006-11-01 14:13:31 · 14 answers · asked by CrazyBlueEyedGirl13 1 in Mathematics

I need to solve these 2 questions:

1. Find the solution to the following diff. equation
(x+y)dy/dx + y = 0
the answer should be y^2+2xy=C

2. Wich is the solution to the following differential equation?
dy/dx - (1/x)y = -xy^2
the answer should be x/(2x^2 + C)

I tried working them according to what the book shows me but get stuck. I used Q(x)= -x P(x)= -1/x
let n = 2

Who can help?

2006-11-01 14:13:20 · 2 answers · asked by dutchess 2 in Mathematics

Is a machine still a Perpetual Motion one if you have to "start it". I mean only once until you actual stop it. Like if it was a car that you had to start, but after that it just kept going and going, like that energizer bunny?

2006-11-01 14:08:20 · 8 answers · asked by esage321 2 in Physics

An object hanging in the air, caused a scale to balance at 0.0554 kg. When the object was submerged in water, the scale balanced at 0.0370 kg.

1-What is the volume of the object? (density of water = 1000 kg/m3)

2-What is the density of the object?

2006-11-01 14:05:48 · 1 answers · asked by Anonymous in Physics

I need the formulas of the derivative of
e^u
log(a)u <--I dont know how to write it, it is meant to be logarithm with base a of the number u (the a is subindex)
a^u
ln u

I have maths exam tomorrow and I think all the formulas I have are wrong because my teacher confuses logarithms, but the exam is not applied by my teacher so I need the correct formulas, please if you have a good maths book somewhere could you share the formulas with me? thnx

2006-11-01 14:04:32 · 4 answers · asked by Tuzin 1 in Mathematics

2006-11-01 14:03:13 · 4 answers · asked by debbie2243 7 in Geography

How many different rectangles are there in an area of 36cm squaredmif the side lengths, in cm, are intergers?

A. 1
B. 3
C. 4
D. 5

2006-11-01 13:58:29 · 2 answers · asked by Cutie P 2 in Mathematics

plz give me anywebsite anything any info as to where i can find information on the EFFECTS OF UV RADIATION THE ANATOMICAL AND MORPHOLOGICAL CHNAGES IN CFERN??????

2006-11-01 13:58:11 · 1 answers · asked by Anonymous in Biology

1)People in early civilizations (140 A.D.) believed that __________________ was the center of the universe.
2) Why do the Moon and Sun appear to be the same size from Earth?
3) List two different things the Earth's atmosphere protects us from.
Thanks buddies!!! Big streess relief on ur part!!! :)

2006-11-01 13:58:05 · 3 answers · asked by C.J. W 3 in Astronomy & Space

it is a tree

2006-11-01 13:57:49 · 4 answers · asked by Hélène D 1 in Botany