Science & Mathematics - 24 July 2007

A steel beam is placed vertically in the basement of a building to keep the floor above from sagging. The load on the beam is 5.8 × 104 N, the length of the beam is 2.8 m, and the cross-sectional area of the beam is 7 × 10-3 m2. Find the vertical compression of the beam.

2007-07-24 07:43:56 · 2 answers · asked by Anonymous in Physics

If the atmosphere were isothermal the pressure at a given height would vary as follows:

P = P' e^Mgh/RT

where P' = 1 ATM, M is the average molar mass (0.80*28 + 0.20*32), g = 9.81m/s^2, R = 0.08206 l atm/mole degree K,
T = degree K

Given 100,000 L He @ 25*C & 1 ATM in a rigid ballon carrying a 100 kg load how high would it rise till it reaches equilibrium?
I've tried this one for 3 weeks and I'm getting nowhere.

2007-07-24 07:43:22 · 4 answers · asked by jbowers9 1 in Physics

using the carbon calculator gives this figure.

2007-07-24 07:42:00 · 6 answers · asked by Anonymous in Engineering

Recently a math or science question stated baldly: "I don't want an explanation. I just want an answer." I did not answer that question.

There are times when all of us would like an answer -- without an explanation. That's fine, and I have no complaint in general. But all too often, someone has a homework assignment, and all they want is to get it finished. Some have the chutzpah to list six problems, all identical in concept, and expect to get the six answers [which they often do : < ]. There seems to be little wish to learn to do the work on their own. There is even the notion that only a nerd would do the work if a friend can supply the answer.

When someone posts a question with "I got the following. Is that correct?" or "I'm having problems with this assignment. Can someone give me a clue?" I respond as often as I am able. I know that textbooks are not always clear, and that an alternate explanation can clarify things.

Am I wrong to 'help,' but not to 'answer?'

2007-07-24 07:40:31 · 5 answers · asked by anobium625 6 in Mathematics

2007-07-24 07:40:01 · 2 answers · asked by Troy 1 in Mathematics

observed lines when hydrogen is excited in a discharge tube (using a prism), we see violet, blue-green, and red as the brightest and some other very dim colors.
the question is:
can you think of one or more likely explanations of the origin of the variation in the observed intensity of the colors?

thanks!

2007-07-24 07:37:13 · 4 answers · asked by k_mal116 1 in Chemistry

I found tadpoles in what is left of our pool. They are small and black. I want to know what to feed them and if it is a toad or a frog.

2007-07-24 07:34:20 · 4 answers · asked by liz 1 in Zoology

I really need help with a water titration question, if someone would be kind enough to e-mail me at mcgowacd@Jmu.edu i'd greatly appreciate it. I'll then e-mail you my question or we could talk about it over msn, yahoo messenger, or aim. I basically have to find out the amount of calcium in my water, I'm pretty sure I have all the information to be plugged into the equation, but its just boggling my mind. Thanks, Chris

2007-07-24 07:33:24 · 3 answers · asked by Anonymous in Chemistry

2. Simplify: square root 27 - square root 3?

I got 2 square root 3x for the first one and 9 square root 3 on the second one. Is this right?

2007-07-24 07:33:04 · 8 answers · asked by Anonymous in Mathematics

I heard some rumours lately that the video we were sent from the moon was not real.What do you think

2007-07-24 07:32:51 · 10 answers · asked by Anonymous in Astronomy & Space

A boat cruises downstream for 2 hours before heading back. It takes 3.5 hours going upstream to get back. If the speed of the stream is 8 mph, what is the speed of the boat in still water?

2007-07-24 07:32:13 · 4 answers · asked by t.wes87 2 in Mathematics

2007-07-24 07:24:19 · 4 answers · asked by anrtech 1 in Engineering

I keep confusing simplify and evaluate can someone please help and give me an explanation that may help me understand the difference better

2007-07-24 07:17:43 · 8 answers · asked by Anonymous in Mathematics

How did it get started? How can we prevent it? How does it affect our lives? How will it effect the future?

2007-07-24 07:16:20 · 7 answers · asked by SingingImp 6 in Other - Science

i have bet with some friends i say that lake erie and the surround lake are connected to the alantic ocean

2007-07-24 07:14:04 · 4 answers · asked by cote3162002 1 in Earth Sciences & Geology

find all soluation..............

2007-07-24 07:11:43 · 8 answers · asked by Anonymous in Mathematics

and atheists still wallow around in thir own ****?

2007-07-24 07:10:14 · 11 answers · asked by john constantine 2 in Other - Science

The question on the form I'm filling out says (16a minus 16b), so in my case it would be 16,211 minus 15,593, but which number do you subtract from? Is it 16,211-15,593 or 15,593 -16,211? Would it be a negative number or positive?

2007-07-24 07:09:49 · 8 answers · asked by sarah820w 1 in Mathematics

i need the mathmathic formulas.

2007-07-24 07:07:43 · 8 answers · asked by farzane l 2 in Astronomy & Space

The probability that it will be rainy on Monday is 7/10. The probability that it will be windy on Monday is 6/10. These events are independent. What is the probability that it will be rainy or windy on Monday?

2007-07-24 07:03:57 · 8 answers · asked by t.wes87 2 in Mathematics

I got 6.71 is this right?

2007-07-24 07:01:35 · 8 answers · asked by Anonymous in Mathematics

2007-07-24 07:01:14 · 3 answers · asked by Black Butterfly 1 in Medicine

I keep getting 6.56...is this right? I feel like I am doing it wrong?

2007-07-24 06:59:29 · 6 answers · asked by spiritmoonshine 1 in Mathematics

I really dont get this stuff.

2007-07-24 06:59:05 · 3 answers · asked by babyruth45304 2 in Mathematics

Please I love weather and I what to track it please help me.

2007-07-24 06:58:06 · 5 answers · asked by ghettoboy57 1 in Weather

the mud would be very fine almost like thick whiped cream. If this wouldn't work do you have any other ideas for different kinds of injectors that would work?

2007-07-24 06:57:19 · 6 answers · asked by JoeSchmoe 2 in Engineering

X + 2Y - Z = 5
2X - 4Y + Z = 0
3X + 2Y + 2Z = 3

OK I know there is a long way and a short way. Please show me the short way. Thankyou.

2007-07-24 06:56:54 · 4 answers · asked by Nonya 1 in Mathematics

2007-07-24 06:52:31 · 4 answers · asked by john constantine 2 in Physics

Has anyone seen a all red butterfly or moth. If so where was it seen, ie city/country? It is common to see these butterflies in that area? Can you give a link to a picture or the name of the butterfly?

I saw a red butterfly where I live and this is not common. This is the first time I every saw a butterfly like that before and I can not find it online. Any help would be great.

2007-07-24 06:51:10 · 2 answers · asked by Nelly 4 in Zoology

2007-07-24 06:50:41 · 18 answers · asked by shall_i 1 in Astronomy & Space