Science & Mathematics - 7 October 2007

A 50 grams of metal at 95 degree celcius is dropped into 250 grams of water at 17 degree celcius and warms it up to 19.4 degree celcius. What is the specific heat(c) of the metal?

2007-10-07 21:00:36 · 3 answers · asked by yien 1 in Physics

please answer this question... it would be a great help on me as a student..... thank you...
it is said that ginger can be an alternative source of anti-blood coagulant.. but i can't exactly determine the chemical substance present on it... that can affect the coagulation of blood... thanks good day!!!

2007-10-07 20:58:15 · 2 answers · asked by cute-simple gal 1 in Medicine

Sorry had to repost this, made a big mistake:

I asked this question on answers:
find the limit as n->+infinity:

Lim ((n^3 - 5n^2 + n + 2)^(1/3)-n)

I got the following answer:
-----------------------------
Let's make life simple.
As n --> infinity, the smaller powers of n become negligible
n^3 - 5n^2 + n + 2 --> n^3 - 5n^2 = n^3 * (1 - 5/n)
So the expression tends to
n*[(1-5/n)^1/3] - n
= n* [ 1 - 5/(3n) + O(1/n^2)] - n
= n - 5/3 - n
= -5/3
----------------------

which is right, but I have no idea how he went from:
=n*[(1-5/n)^1/3] - n to: = n* [ 1 - 5/(3n) + O(1/n^2)] - n

I really want to be able to understand this, so that I can do it in the future myself without help, but I have no idea what he did.

2007-10-07 20:50:33 · 3 answers · asked by greeneggs4spam 3 in Mathematics

flng trble by the fact that people come to know everything about me by dreams!!?
i prayedto god '' in ko dikhao me kya hoon.;'read some verses of quran.a clairvoyant did some magic on me.one day while asleep in the night i felt still unable to move and something was injected into my ear .WHAT TO DO?? somebody help me please

You can't

2007-10-07 20:36:51 · 7 answers · asked by beauty 2 in Parapsychology

A device operates at 6 volts and has a power rating of 4 watts. It is connected to a 240 volts a.c supply, using a suitable transformer.

-If the primary coil of the transformer has 4000 turns, how many turns are on the secondary coil?

-Calculate the current flowing in the primary coil?

Please explain, thanks!

2007-10-07 20:27:25 · 3 answers · asked by misseighteen 3 in Physics

2007-10-07 20:24:05 · 18 answers · asked by Anonymous in Astronomy & Space

For example Z_p or Z_2?

2007-10-07 20:23:17 · 2 answers · asked by Hugh 2 in Mathematics

i still dont know if i do. but heres my story:

i was at my friends house and we were on the computer. well recently her older brother had died from an illness. we were also really good friends. so were on the computer and i feel this hand on my shoulder. i thought it was her other younger brother trying to get me to pick him up, but when i turned around there was no one. but it was in no doubt a hand. so later that night, i told my friend cuz i felt like i was burnt there on my shoulder. and she said let me look at it. so i took off my shirt and she examined my shoulder and she kind of shuddered. so i run to the mirror and see this big RED hand print on my shoulder. like a really bad sunburn in the shape of a hand. it was so creepy.

i still dont know if i believe in the paranormal but then again i dont really know how to explain that.

what about you?

2007-10-07 20:21:52 · 7 answers · asked by ? 4 in Paranormal Phenomena

What is the pH of a 0.10 M solution of NH4NO2? Ka for HNO2 = 4.6 10-4, Kb for NH3 = 1.8 10-5 (hint: consider the equilibrium NH4+ + NO2- NH3 + HNO2)

a)6.30
b)2.26
c)9.26
d)2.17

2007-10-07 20:20:32 · 1 answers · asked by Anonymous in Chemistry

2007-10-07 20:20:29 · 8 answers · asked by Anonymous in Zoology

A frictionless roller coaster is given an intial velocity of Vo at height h=30m. The radius of curvature of the track at point A is R=28m. The acceleration of gravity is 9.8m/s2.

Find the maximum value of Vo so that the roller coaster stays on the track at A solely because of gravity.

2007-10-07 20:15:15 · 1 answers · asked by michael 1 in Physics

You have just woke up. You hear the TV. The news is playing on it. The news is that we have extraterrestrial spacecrafts out side of our atmosphere. They appear to be hostel. They want this planet because it is compatible for there needs. Its like when you buy a new house and you have it sprayed for bugs and such. Well its basically the same concept except this time the extraterrestrial beings are looking at use like we are the vermin. The want to exterminate all human life before they move. How would this change your life? What would you do during a time like this. Do you think the human race will survive the hostile alien invasion?

2007-10-07 19:45:19 · 11 answers · asked by TheOtaku86 2 in Astronomy & Space

Take the equation below, trace the steps, and tell me what happened to variable C.

A = B + C (multiply both sides by (A - B))

A(A - B) = (A - B)(B + C) (multiply this out)

A^2 - AB = AB + AC - B^2 - BC (now subtract AC from both sides)

A^2 - AB - AC = AB - B^2 - BC (now simply each side by factoring)

A(A - B - C) = B(A - B - C) (now divide both sides by (A - B - C)

A = B (what happened to C?! My original equation stated that A = B + C, not that A = B. Where did C go?)

2007-10-07 19:44:44 · 7 answers · asked by rawlings12345 4 in Mathematics

In a game of chance, 2 cards are drawn at random from a pack of playing cards without replacement. An ace has a value of 1 and all picture cards have a value of 10 each.

What is the probability of

(i) drawing 2 picture cards,

(ii) drawing 2 cards having the same picture (that is 2 kings or 2 queens or 2 jacks).

(iii) the cards drawn having a total value of 18


Please show your steps clearly..

2007-10-07 19:38:43 · 2 answers · asked by Anonymous in Mathematics

Maybe the big bang theory was caused by a civilization of extraterrestrials who where advanced years beyond or technology. Maybe they had conflicts amongst there selves just as we do. Thus like we do they settled it by war. Maybe the big bang was caused buy there war. On the other hand what if we may be the first of intelligent extraterrestrial beings in this universe? Nevertheless, I am just wondering off in the world of science fiction. So what do all of you think?

2007-10-07 19:36:56 · 7 answers · asked by TheOtaku86 2 in Astronomy & Space

it's not the same as having less serrations is it? cuz the line is taken from a comparison between dinosaurs and birds' teeth.

2007-10-07 19:34:57 · 1 answers · asked by n_alraesi 1 in Zoology

I think this is a simple question but i do not know how...hopefully you guys here could clear my doubt..

The question is:

>>> Given that the equation of a curve is y = x^2 + 3x - 4, tell me how to find the value of the minimum point of the curve?

Please show me the steps..I really want to understand..thanks.

2007-10-07 19:33:23 · 6 answers · asked by Anonymous in Mathematics

they predicted that it would be the end of world...i dont really belive that but i want to know what would happen in sun lines up with the centre of Milky way ?

2007-10-07 19:25:50 · 12 answers · asked by Ali 4 in Astronomy & Space

2007-10-07 19:21:22 · 4 answers · asked by Unni h 1 in Physics

Pls slove 8,4,1,1/3,___,___
Pls give me what is the nth term also pls

2007-10-07 19:20:55 · 2 answers · asked by engchunh 1 in Mathematics

what is the range of power we can transfer for 3 phase 3 wire & 3 phase 4 wire system & why?

2007-10-07 19:15:24 · 9 answers · asked by deepak_8584 1 in Engineering

has horizontal tangents.

2007-10-07 19:09:45 · 2 answers · asked by Jarred Katzekis 3 in Mathematics

find the value of x to two decimal places in the equation. ln x =3

2007-10-07 19:05:05 · 4 answers · asked by jose u 1 in Mathematics

2007-10-07 19:04:48 · 18 answers · asked by debbie s 2 in Geography

solve for the following equation for x 3^x=27

2007-10-07 19:02:22 · 10 answers · asked by jose u 1 in Mathematics

Anyone can tell me how to calculate tonnages available for mining.............Ask for more details if the question is not clear......

2007-10-07 18:55:13 · 1 answers · asked by Anonymous in Earth Sciences & Geology

Macrobid is a antibiotic used to treat UTI's. It expired in January of 2007. Did it just lose potency, or does anyone know if the chemical makeup of the medicine changes so as to be harmful?

2007-10-07 18:54:18 · 2 answers · asked by Anonymous in Medicine

What are the two numbers?

2007-10-07 18:50:12 · 11 answers · asked by Flo 1 in Mathematics

Does u =arctan and du =1/1+x^2 and
dv=1/x and v =ln|x|? if so why do I keep getting the wrong answer?

2007-10-07 18:47:50 · 1 answers · asked by houstonman20042002 1 in Mathematics

John brought an MP3 player for $240. Given that he offred a 28% discount on the selling price and still made a 20% profit, find the selling price of the MP3 player.

2007-10-07 18:45:17 · 6 answers · asked by engchunh 1 in Mathematics