English Deutsch Français Italiano Español Português 繁體中文 Bahasa Indonesia Tiếng Việt ภาษาไทย
All categories

Science & Mathematics - 29 September 2006

[Selected]: All categories Science & Mathematics

Agriculture · Alternative · Astronomy & Space · Biology · Botany · Chemistry · Earth Sciences & Geology · Engineering · Geography · Mathematics · Medicine · Other - Science · Physics · Weather · Zoology

I only have a few, but more would be nice!

2006-09-29 17:11:32 · 5 answers · asked by caged_bird88 2 in Astronomy & Space

1. calculate the work done when 1.0mol. of water at 100deg.cent. vapourises against an atmospheric pressure of 1 atm. Assume ideal behaviour and volume of liquid water to be negligible.
2. A gas is expanded from 300cubic cm to 500 against an average pressure of 760mm Hg At the same time 2J heat has been also supplied to the system. Calculate the change in internal energy.
3. Calclate the difference between heats of reaction at constant pressure and constant volume for the reaction at 25 deg.C in KJ
4.The heat of combustion of benzene at constant volume was found tobe 326.9KJ/mol. at 25deg.C. Calculate the heat of combustion of benzene in KJ at constant pressure.

2006-09-29 17:11:31 · 1 answers · asked by sunitha nkumar 1 in Chemistry

winning numbers only please.

2006-09-29 17:09:35 · 6 answers · asked by lazerus1962 1 in Mathematics

I mean to say that it will have a self recharging mechanism inside it.like rechargeable batteries.It will run on electricity.Wind or solar energy can be used to recharge inside mechanism,instead of recharging it with electricity.

2006-09-29 17:04:12 · 26 answers · asked by alexander_nutrov 1 in Physics

y-axis is pH, x-axis is "Molar Equivalents." How do I get that value? I have the volume of 1 N of HCl and 1 N NaOH and the pH value of every 0.1 mL of HCl/NaOH that added to the unknown amino acid.

2006-09-29 17:01:13 · 2 answers · asked by Brian 3 in Chemistry

I think I know the answere but a friend of mine positively believes that cow are smart, even smarter than horses. Maybe if enough people will answere he will change his mind.

2006-09-29 17:00:57 · 15 answers · asked by johnn 1 in Zoology

2006-09-29 16:54:08 · 6 answers · asked by jani 1 in Chemistry

We did an experiment in physics lab by swinging a pendulum and measuring its period. There were 2 measurements taken 10 timings of a single swing and 10 timings of 9 swings. The purpose of the experiment was to use a pendulum to demonstrate the random nature of a physical measurement & to examine experimental methods that can sharpen this fuzziness. And theres this extra credit Q and it is as follows, if u have any suggestions i would be greatfull.

You get this credit for clever modifications of the original experiment that allow you to learn something new. You are essentially doing another experiment.

You need to do the following:
60. Come up with a testable hypothesis, not covered in future experiments.
61. Take measurements
Show sample calculations.
Do an error analysis.
Show the data analysis, complete with calculations and plots
62 Draw conclusions apart from the purpose of the assigned experiment.

2006-09-29 16:53:41 · 3 answers · asked by 3ajeeba_q8 2 in Engineering

And do you need like a permit to handle it or they just like sell it to you or what i dont know much about it, just curious though?

2006-09-29 16:52:51 · 5 answers · asked by guitlamo13 2 in Other - Science

For any triangle, develop a formula [or algortihm] that will find the length of the segment that connects the vertex of a triangle to any point on the opposite side. For example, in the diagram, your formula or algorithm would help someone calculate the length of segment CD. Click this link to view the picture.

http://i14.photobucket.com/albums/a328/X_Frankie_Iero_X/extracredit.jpg



Just for your information, this is no sort of homework, project, essay, etc. It is mainly extra credit, so it's not my teacher has reviewed this. Obviously I can't ask my teacher for help, mainly because it's extra credit.

2006-09-29 16:45:29 · 5 answers · asked by David 3 in Mathematics

object if it came to a complete stop?

2006-09-29 16:39:00 · 14 answers · asked by mhdow2000 2 in Physics

2006-09-29 16:38:45 · 3 answers · asked by sakura 2 in Astronomy & Space

I heard that if that happens it is called death rings. Why does it happen? Please serious answers only. I know drugs are bad so please spare me the lecture. My friend scares me when she tells me this happens to her.

2006-09-29 16:34:50 · 4 answers · asked by l'il mama 5 in Other - Science

i need some moving animations and not still pic.....

2006-09-29 16:29:34 · 2 answers · asked by cheril m 1 in Biology

Ok so I have already worked these problems out but I'm just wondering what you guys get. Here are the problems:

Bill is in outer space on his way out of L.A. A force of 10 N pushes on Bill. Suddenly, when Bill has reached a speed of 250 mph, another 10 N force, directed opposite to the first force, also pushes on Bill. Now, with both forces acting on Bill, what happens to Bill's speed?

a) Bill will stop.
b) Bill will slow down.
c) Bill will speed up.
d) Bill will continue moving at a constant velocity.

Number 2:

Two blocks of masses 20 kg and 8 kg are connected together by a light string and rest on a frictionless level surface. Attached to the 8 kg mass is another light string which a person uses to pull both blocks horizontally. If the two-block system accelerates at 0.6 m/s^2, then what is the tension in the connecting string between the blocks?

a) 12 N
b) 6.0 N
c) 20 N
d) 4.0 N

Please provide why you feel the answer is right. Feel free to send me an IM. :)

2006-09-29 16:28:46 · 4 answers · asked by Anonymous in Physics

with a radius of 4.9 cm. A mass on the left is 15 kg, and a mass on the right is 4.9 kg. The masses are hanging freely with the center of their masses a vertical distance of 2.7 m apart. (Acceleration of gravity = 9.8 m/s2)

What is the rate that the two masses are accelerating when they pass each other (answer in m/s2)?

What is the tension in the cor when they pass each other (answer in N)?

2006-09-29 16:28:18 · 2 answers · asked by Dee 4 in Physics

2006-09-29 16:23:45 · 5 answers · asked by Thien Pham 1 in Medicine

2006-09-29 16:23:39 · 6 answers · asked by The G Man 1 in Astronomy & Space

This problem involves the sum of the numbers showing on two fair dice.

(1) What is the probability that exactly one die shows a 3 given that the sum of the numbers is 9?

(2) What is the probability that the sum of the numbers is 9 given that at least one die shows a 3?

2006-09-29 16:21:59 · 6 answers · asked by J R 2 in Mathematics

Short of going to a jeweler how would I determine whether or not I've found a diamond. Not a raw one but an already cut diamond.

2006-09-29 16:21:09 · 9 answers · asked by Anonymous in Other - Science

2006-09-29 16:20:02 · 32 answers · asked by wayniepoo62 2 in Physics

2006-09-29 16:16:16 · 2 answers · asked by msahagen 1 in Engineering

2006-09-29 16:12:56 · 6 answers · asked by fasisi2003 1 in Physics

1. Determine whether this quadratic function has a maximum value or a minimum value, and then find the value:f(x) = 2x2+8x+ 5

2. Solve this inequality:(x-5)(x+2) > 0

3. True/false....The minimum value of f(x) = -x2 + 4x + 5 is f(2)

2006-09-29 16:12:35 · 7 answers · asked by KISMET 2 in Mathematics

It is unsertstood that E=mc2 then is it true that if you slow down energy down enough it will become mass?

2006-09-29 16:00:54 · 2 answers · asked by Ryt d 2 in Other - Science

fedest.com, questions and answers