Science & Mathematics - 11 December 2007

100.0 liters of water steam collected at 127.0 degrees celsius ( under 1 atm) to ice at -20.0 degrees celsius. (Molar mass: O = 16.00 g, H = 1.008 g. The specific heat of ice is 2.03 J/g-degrees celsius, the specific heat of water is 4.184 J/ g- degrees celsius, the specific heat of steam is 1.99 J/g-degrees celisius. the heat of fusion is 6.01 kilojoules for water, and he heat of vaporization is 40.79 kilojoules for water)

2007-12-11 06:01:06 · 1 answers · asked by peluc 1 in Chemistry

A) 21 sq. cm
B)52 sq. cm
C)42 sq. cm
D)104 sq. cm

2007-12-11 06:00:09 · 2 answers · asked by Anonymous in Mathematics

2007-12-11 05:58:50 · 1 answers · asked by Daniel P 2 in Chemistry

Hope everyone is doing okay!

2007-12-11 05:58:34 · 10 answers · asked by ladybugwith7up 3 in Weather

2007-12-11 05:58:25 · 3 answers · asked by calvin l 1 in Mathematics

I was solving the puzzles at
http://puzzlingpage.googlepages.com/1.ht...
and i got stuck on 7th page...
somehow sept is related to 7, i want to know what will be 8 in the same way

2007-12-11 05:57:50 · 8 answers · asked by dheeraj r 1 in Mathematics

A. moderator
B. coolant
C. control rod
D. critical mass

2007-12-11 05:55:09 · 3 answers · asked by cofeavloit 1 in Physics

drawing a blank on this problem, if you can explain how to do it that would be much appreciated.
thanks

2007-12-11 05:54:18 · 6 answers · asked by chirch 1 in Mathematics

2007-12-11 05:53:13 · 11 answers · asked by linda a 1 in Mathematics

The radius of the girth of the planet is a=1000km, and the larger radius c of the donut itself is unknown, but very large c>>a. I use notation a and c as can be seen here:
http://mathworld.wolfram.com/Torus.html

Due to global warming the temperature of the atmosphere is gradually increasing. At what temperature will the atmosphere completely 'evaporate' and dissapear?

The acceleration of gravity on the surface is g=1m/s².

2007-12-11 05:52:34 · 4 answers · asked by Anonymous in Physics

are the following acidic, basic, or neutral.
a-purified tap water(pH=7)
b-Lemon Juice(pH=2.7)
Draino(pH=10)

2007-12-11 05:51:46 · 7 answers · asked by kat 1 in Chemistry

2007-12-11 05:49:50 · 16 answers · asked by Anonymous in Earth Sciences & Geology

Calculate the energy needed to change 10 grams of water from 70 degrees C to 110 degrees C.

I need the energy in Kcal.

2007-12-11 05:49:34 · 1 answers · asked by raullozoya@sbcglobal.net 1 in Chemistry

2007-12-11 05:48:32 · 2 answers · asked by Raj 1 in Mathematics

what number must be added to 9x^2 + 9x to form a perfect square? please show work/ explain it.

2007-12-11 05:48:08 · 3 answers · asked by pinkduck000 2 in Mathematics

What is the base-10 logarithm of the molar concentration of a salt, AX, with pKsp = 50.729?

2007-12-11 05:47:53 · 1 answers · asked by Kurls 1 in Chemistry

a 60kg bungee jumper jumps from the same height as the fixed end of a 10m bugee cord of ks = 200N/m. If g = 10m/s^2 what is the maximum extension of the cord.

Assume cord obeys hookes law, ignoring friction and air resistance. And considering the energy of the system: person + cord.

The answer is 11.3m but I'm having trouble getting it.

2007-12-11 05:47:53 · 3 answers · asked by eazylee369 4 in Physics

2007-12-11 05:47:31 · 2 answers · asked by swimfastmr_s 1 in Geography

Consider a salt of composition, A2B3. For this salt, pKsp = 86.909. What is the logarithm of the molar concentration of this salt?

2007-12-11 05:45:15 · 1 answers · asked by Kurls 1 in Chemistry

evaluate the integral of

sec^2xtanxdx, u=tanx

can someone explain how to do this?

I'd appreciate any help.

Thanks.

2007-12-11 05:44:35 · 2 answers · asked by Anonymous in Mathematics

4 Science Assement
Cant find that piece of info Anywhere =[
Plz Help !
Ta

2007-12-11 05:43:00 · 3 answers · asked by Anonymous in Biology

or do you think we will be here(not us literally obviously) when that time comes?

2007-12-11 05:42:47 · 23 answers · asked by Phoenix Trite 4 in Astronomy & Space

answer in units of kgm^2/s

2007-12-11 05:42:07 · 2 answers · asked by ms. nelz09 1 in Physics

1. (2ab^2)(-3abc^2)(5a^2c)
2. 1/x+3 - 2x/ x^2+6x+9
3. 5x^2/-5x

2007-12-11 05:41:36 · 2 answers · asked by brock.young 1 in Mathematics

And please don't give me a wikipedia link!

2007-12-11 05:41:09 · 3 answers · asked by Anonymous in Biology

Integrate from 0 to 1 (x^2)(sqrt5x+6)dx

I am having trouble with u substitution, if anyone could help me it would be appreciated. Thanks

2007-12-11 05:40:57 · 2 answers · asked by Anonymous in Mathematics

I'm bad with translating grams to fraction form could someone give me a list? Thank you

2007-12-11 05:39:59 · 4 answers · asked by kareem7rev 1 in Mathematics

Find the perimeter of the triangle shown in the figure.

Note: The triangle shows the following numbers on each side...
top-4; left-square root 5(negative sign in the middle) and sqare root 3...right-square root 5(positive sign in the middle) and square root 3...PLEASE HELP!

2007-12-11 05:37:03 · 2 answers · asked by God Bless America!~ 4 in Mathematics

I was told humid air is less dense than hot dry air. Why is this? I thought the heat would make the gas disperse and therefore less dense, and that saturating it with water would cause greater density than not having anything in it at all.

2007-12-11 05:36:44 · 5 answers · asked by Anonymous in Physics

I am trying to conceptualise how evolution happens , I have read a few answers and it is a bit fuzzy.

Someone says that a new species doesnt just materialise overnight and 1 species does not give birth to a new species but gradual small changes occur within the species and over time this somehow creates a new species.

This sounds to me like there are no clear boundries between species.

How does evolution happen, how did an ape evolve into a human.

2007-12-11 05:36:36 · 4 answers · asked by ADad 5 in Zoology