Science & Mathematics - 21 November 2007

Which of the following can heat up a 500g sample of roo-temperature water the most: 200g of rock at 100C, 200g of steel at 100C, or 200g of water at 100C?
a) Design an investigation to answer this question. (The masses should be equal, but they don't have to be 200g.)

i think i know the answer but i need to know if i'm right or not so help me, plz. (I think its steel b/c it's a metal and they conduct heat very well.)

2007-11-21 12:26:22 · 1 answers · asked by caramel 1 in Earth Sciences & Geology

walking along a river, start to finish, what is it like?? What do you see? meanders, exaplin them, whirlpools, explain them, etc

2007-11-21 12:25:05 · 4 answers · asked by Jessiica E 1 in Geography

My kid is looking for all the sounds that only the animals can hear and of course what are those sounds
Thanks!!

2007-11-21 12:24:48 · 8 answers · asked by Eduardo P 2 in Zoology

Question is not serious - just in the "spirit" of fun.

Hopefully, no whiny baby will go to yahoo and ask for its removal.

2007-11-21 12:24:12 · 14 answers · asked by Anonymous in Paranormal Phenomena

2012

2007-11-21 12:23:32 · 7 answers · asked by fraz.s.u.s.s 2 in Astronomy & Space

in M3x3 the 3x3 should be a subscript. please explain your answer!

2007-11-21 12:22:28 · 2 answers · asked by kELY 3 in Mathematics

A 17.40-mL sample of potasium hydroxide is titrated to the stoichiometric point with 19.80 mL of 0.262 M HNO3(aq).
What is the molarity of the basic solution (potasium hydroxide) BEFORE it is titrated ?

2007-11-21 12:21:15 · 2 answers · asked by Anonymous in Chemistry

2007-11-21 12:20:36 · 12 answers · asked by Anonymous in Astronomy & Space

you multiply it by 5 and subract 165 gives you a # that when you knock off the last two digits brings you back to the original #?

2007-11-21 12:17:18 · 4 answers · asked by snickers 1 in Mathematics

If it is daytime here and we see the moon (sometimes) during daylight hours, how is it that people who are in the night hemisphere of the earth see the moon as well? Or do they not? Do they just not have a moon on those nights?

Always wondered about this. I've considered asking my Exploration of Space instructor, but I can't seem to word the question right verbally.

2007-11-21 12:10:29 · 8 answers · asked by Lindsay 3 in Astronomy & Space

Please explain

2007-11-21 12:09:05 · 5 answers · asked by Bobby S 3 in Mathematics

2007-11-21 12:05:10 · 4 answers · asked by Alicia J 1 in Geography

2007-11-21 12:04:40 · 2 answers · asked by Anonymous in Biology

can u guys give me some help please... ok so i got this chemistry project, I was assigned the element selenium. and now i have to make a poster board on it(needs to be creative) and i have no idea what selenium is and everywhere i look makes no sense

2007-11-21 12:02:53 · 3 answers · asked by Anonymous in Chemistry

I got my wisdom teeth removed yesterday, and was prescribed generic Percocet for the pain. However, I would like to be able to drink wine with Thanksgiving dinner tomorrow. Under NO circumstances are you supposed to mix alcohol with this drug.

Most of my pain has already subsided, so if I stop taking my Percocet tonight, would I be able to drink wine tomorrow afternoon without any risk?

2007-11-21 12:01:04 · 5 answers · asked by lemonyskillet 2 in Medicine

2007-11-21 12:01:02 · 3 answers · asked by Anonymous in Chemistry

a)Find the parametric equations for the line through the point P = (4, -4, 1) that is perpendicular to the plane 3x + 1y - 4z = 1.
t = 0
x=
y=
z=
B)At what point Q does this line intersect the yz-plane?

2007-11-21 11:59:56 · 3 answers · asked by timz11 1 in Mathematics

2007-11-21 11:54:30 · 3 answers · asked by Dan 2 in Astronomy & Space

2007-11-21 11:53:12 · 2 answers · asked by Slash_GNR 1 in Chemistry

What one digit number can represent G, H, E, and F in these number sentences

H + H = G
E x H = E
G + F = G

I think that F is 0 but thats as far as I got. I have a feeling that G is an even number and H is half of that even number. I mostly need help with finding E. If i am wrong please correct me.

2007-11-21 11:51:30 · 19 answers · asked by Anonymous in Mathematics

2007-11-21 11:50:35 · 6 answers · asked by Chris K 1 in Earth Sciences & Geology

2007-11-21 11:47:13 · 4 answers · asked by Alicia J 1 in Geography

okk
if the percent is 5 1/4
well then what is the fraction and the decimal????

2007-11-21 11:47:12 · 5 answers · asked by Anonymous in Mathematics

I am horrible with percents and i can not remember how to do them xD lol. so if anyone knows that would be great.thanks. :)

2007-11-21 11:44:48 · 34 answers · asked by poison_inke 1 in Mathematics

I was wondering if you could mold clay into a sphere then fill it with aluminum. Then put it over a fire and wait until the aluminum melts then put it in a freezer and it would come out as a sturdy, aluminum sphere. Thanks!

2007-11-21 11:44:24 · 1 answers · asked by Bryan C 1 in Chemistry

2007-11-21 11:41:59 · 5 answers · asked by Anonymous in Mathematics

why is it that there has been a sudden outburst of friut flies in my house? this has never happened before and they are mostly hanging out at the trashes and toilets.

2007-11-21 11:40:30 · 2 answers · asked by tamazer83 2 in Zoology

A Carnot heat engine operates between reservoirs at Th= 1545 K and Tc= 150 K. in each cycle, 250 joules of heat energy is rejected to the low temperature reservoir. in each cycle, how much mechanical work W is performed by the engine?

2007-11-21 11:28:26 · 1 answers · asked by ecast4uhm246 1 in Physics

2007-11-21 11:26:02 · 24 answers · asked by Q4U 2 in Zoology

While hanging a mirror.I thought if only I could see inside the wall like a ghost.No more stud finders,measuring tapes.What other ways would a ghost come in handy?Around the house and life in general.

2007-11-21 11:19:40 · 11 answers · asked by Dr. NG 7 in Paranormal Phenomena