Science & Mathematics - 21 September 2006

well i can't find the really (standard) answer if any one have the good answer, or explain why, i 'l be happy.
and thanks for your time

2006-09-21 14:24:46 · 4 answers · asked by Nini 1 in Biology

2006-09-21 14:24:07 · 11 answers · asked by Korey's Mamacita 1 in Mathematics

bcuz ive herd that from some friends but i dont kno if its true

2006-09-21 14:22:15 · 9 answers · asked by petercriss45 1 in Biology

2006-09-21 14:21:03 · 6 answers · asked by rizwanjattala385 1 in Chemistry

2006-09-21 14:21:02 · 6 answers · asked by Anonymous in Other - Science

A student calculates the density of iron as 6.80 g/cm^3 using lab data for mass and volume. A handbook reveals that the correct value is 7.86 g/cm^3. What is the percent error?
(Show work)

2006-09-21 14:18:42 · 3 answers · asked by Lion 1 in Chemistry

what was the first animal to be launched into outer space?.......some say monkey and some say dog...{homework question}

2006-09-21 14:13:47 · 19 answers · asked by Rachael C 1 in Other - Science

180-(360)/n=(180(n-2))/n
P.S 180 and 360 are degrees.
write your answear and ill decide who has the best answear

2006-09-21 14:13:40 · 7 answers · asked by coolkenny45 2 in Mathematics

i have wachted THE LAKE HOUSE but i don't understand about the logic hehind it. Or is it logic? Can we really connect to the past world?????????????????/

2006-09-21 14:13:01 · 6 answers · asked by LOTS OF QS 1 in Physics

why they want to name it like that?

2006-09-21 14:11:12 · 5 answers · asked by Ling 2 in Other - Science

2006-09-21 14:07:28 · 9 answers · asked by chops 2 in Earth Sciences & Geology

THE QUESTION:
Initially, a rigid 6-m^3 tank contains helium (assumed to be an ideal gas) at 300 K and 0.10 MPa. The tank is then heated until the temperature reaches 400 K.

A pressure-relief valve at the top of the tank opens when the pressure reaches 0.15 MPa, and the helium flows out, preventing the pressure from exceeding 0.15 MPa. Determine the final mass (kg) of helium in the tank.


MY ANSWER:
So, in hoping that people don't think I just posted this up here without trying, this is what I've done so far--

I couldn't really come up with a way to go use PV=nRT a couple of times to keep transforming. What I noticed though is that I **THINK** I have everything I need for the final state.

I just looked at the state after the process. It MUST have the same V. And it tells us the P&T. I used V=6 P=.15 T=400. As the question described, it sounds like this is the final state. I calculated n from this using PV=nRT, and converted it to kg using its amu.

thoughts?

2006-09-21 14:06:23 · 5 answers · asked by wilburrr 2 in Engineering

I am looking for a online calculator that will do fractions. I need it for school.

2006-09-21 14:05:53 · 2 answers · asked by Alex M 2 in Engineering

2006-09-21 14:05:48 · 3 answers · asked by Anonymous in Biology

2006-09-21 14:05:38 · 3 answers · asked by Anonymous in Mathematics

I'm doing a report/project and need 2 know what a 12 sideded figure is called?

2006-09-21 14:04:23 · 9 answers · asked by Pr3tty_Princ3$$ 1 in Mathematics

Have to crop pictures to 600 pixels x 600 pixels? Need to know inches in pixels.

2006-09-21 14:04:08 · 6 answers · asked by bad1948 1 in Mathematics

Which foods that are easy to digest do you get the most potassium from? Not just high potassium food, the ones that are the easiest to digest as well.

2006-09-21 14:03:35 · 2 answers · asked by Joe M 2 in Chemistry

This is for a 6th grader's level. Thank you

2006-09-21 14:01:41 · 2 answers · asked by ginna 1 in Biology

i'm doing a project where you have to make a model of aurora borealis and i take a globe and flash light and shine the light on the globe but it can only hit the north and south poles

2006-09-21 14:01:21 · 3 answers · asked by haha_hotie90 1 in Astronomy & Space

2006-09-21 13:59:51 · 3 answers · asked by Anonymous in Chemistry

2006-09-21 13:58:30 · 5 answers · asked by Anonymous in Mathematics

Yesterday there was news of a 3.3 million year old Australopithecus afarensis fossil from Ethiopia. I'm just curious as to how they ascertain the age. I know it's not carbon-14 dating, that's 2 orders of magnitude beyond its range. It's been a while since I learned about this stuff, so thanks for refreshing my memory.

2006-09-21 13:58:24 · 6 answers · asked by southeastside 2 in Earth Sciences & Geology

the golden mean.

2006-09-21 13:57:55 · 2 answers · asked by ttybrs10 1 in Mathematics

2006-09-21 13:57:53 · 5 answers · asked by surinjadbir_4eva 1 in Biology

2006-09-21 13:56:21 · 8 answers · asked by lundclr@sbcglobal.net 1 in Astronomy & Space

8 is the whole number and 2/3 is the fraction
6 is the whole number and 3/4 is the fraction

2006-09-21 13:54:01 · 5 answers · asked by Anonymous in Mathematics

2006-09-21 13:53:40 · 10 answers · asked by MzJade 1 in Physics

A sample of a certain material has a mass of 2.03 * 10^-3 g. Calculate the volume of the sample, given that the density is 9.133 * 10-1 g/cm^3. Use the four-step method in solving the problem.

2006-09-21 13:53:36 · 3 answers · asked by Lion 1 in Chemistry

umm... help please if you want to tell me something that does not relate to my question please keep it to yourself.thank you

2006-09-21 13:50:59 · 4 answers · asked by sunshine 1 in Earth Sciences & Geology