Science & Mathematics - 3 August 2007

factor each difference or sum of cubes

2007-08-03 16:25:24 · 4 answers · asked by mustang_muscle06 1 in Mathematics

2007-08-03 16:24:13 · 7 answers · asked by mhaina 1 in Engineering

Any proof dug up on the question. Im a math guy so i need proof to think its true. Proof as in focils or bones.

2007-08-03 16:24:07 · 12 answers · asked by Anonymous in Zoology

We've been there before, set up radio and TV towers, found the algae that supposedly supported life on the moon, etc. It just seems like a waste of money seeing there is nothing really left to do.

2007-08-03 16:23:50 · 15 answers · asked by Anonymous in Astronomy & Space

2007-08-03 16:18:31 · 14 answers · asked by Anonymous in Mathematics

blazing light

2007-08-03 16:18:23 · 5 answers · asked by Anonymous in Astronomy & Space

In a study of worker efficiency at Wong Labs it was found that the number of components assembled per hour by the average worker (t) hours after starting work could be modeled by the formula: N(t) = -3t^3 + 23t^2 + 8t.

A) rewrite the formula by factoring the right hand side completely

B) use the factored version of the formula to find N(3)

2007-08-03 16:17:55 · 3 answers · asked by mustang_muscle06 1 in Mathematics

2007-08-03 16:16:27 · 6 answers · asked by Anonymous in Mathematics

1. a 3.52 kg lead can inside a calorimeter contains 2.25 kg of water at 37.5 degree celsius.What mass of silver at 108.6 degree celsius added to the calorimeter would result in a final temperature of 45 degree celsius.
(C of water- 4186 J/kg-Cdegree, C of lead- 128 J/kg-Cdegree, C of siver 235 J/kg-Cdegree)

2.A combination of 0.250 kg of water at 20 degree celsius, a 0.400 kg of aluminum at 26 degree celsius and 0.100 kg of copper at 100 degree celsius is mixed in an insulated container and allowed to come to thermal euilibrium.Ignore any energy transfer to or from the container and determine the final temperature of the mixture.( C of water-4186 J/kg-Cdegree, Caluminum -910 J/kg-Cdegree, C of copper- 390 J/kg-Cdegree)

2007-08-03 16:02:49 · 2 answers · asked by ice_cream_chico 1 in Physics

Is there some kind of technology which is kept secret and not allowed to talk or discussed about?

2007-08-03 16:02:16 · 1 answers · asked by M m 1 in Engineering

Physically Speaking.....

2007-08-03 15:57:03 · 7 answers · asked by Anonymous in Medicine

is this restless Leg SyndromE?

2007-08-03 15:55:50 · 1 answers · asked by Anonymous in Medicine

''in a static situation, the electric field at the surface of a conductor can have no component parallel to the surface because this would violate the condition that the charges on the surface are at rest. '' would this same statement be valid for the electric field at the surface of an insulator?explain why answer and the reason for any differences between the cases of a conductor and an insulator.

2007-08-03 15:53:26 · 2 answers · asked by DiMaHaZiaF 1 in Physics

A mass weighing 3 lb stretches a spring 3 in. If the mass is pushed upward, contracting the spring a distance of 1 inch, and then set in motion with a downward velocity of 2 ft/sec, find the position of the mass at any time t. Assume that there is no damping and the only force acting upwards is the spring's force (F = -k(Delta(x))). Delta(x) = change of position from equilibrium. Determine the frequency (W), period (T), amplitude (A) and phase of motion (P). The answer by the way is x = (sqrt(2) * .25)*sin(8*sqrt(2)*t) - (1/12*cos(8*sqrt(2)*t)) ft. Where W = 8*sqrt(2), T = sqrt(2)*(pi/4), A = sqrt(11/288) and P = pi - arctan(3/sqrt(2)). I just don't know how to get this. Thanks.

2007-08-03 15:50:16 · 1 answers · asked by Charlie4590 2 in Mathematics

a solid conductor has a cavity in its interior. would the presence of a point charge inside the cavity affect the electric field outside the conductor? why or why not?would the presence of a point charge outside the conductor affect the electric field inside the cavity? again, why or why not?

2007-08-03 15:47:27 · 2 answers · asked by DiMaHaZiaF 1 in Physics

2007-08-03 15:42:00 · 6 answers · asked by Anonymous in Geography

2007-08-03 15:40:50 · 2 answers · asked by Anonymous in Biology

a spherical Gaussian surface encloses a point charge q. if the point charge is moved from the center of the sphere to a point away from the center, does the electric field at a point on the surface change? does the total flux through the Gaussian surface changed?explain..

2007-08-03 15:40:10 · 3 answers · asked by DiMaHaZiaF 1 in Physics

2007-08-03 15:39:27 · 2 answers · asked by Anonymous in Biology

Will we see blue pieces of skies falling on the ground? or clouds scattered around? how will we notice if the sky falls down?

PS. let's assume it's possible

2007-08-03 15:29:33 · 16 answers · asked by Anonymous in Astronomy & Space

please do explain well, for me to understand too.

thank you.

2007-08-03 15:27:06 · 8 answers · asked by Anonymous in Physics

A) TGCATAGGT
B) UGCAUAGGU
C) ACGTATCCA

2007-08-03 15:26:10 · 3 answers · asked by Anonymous in Biology

I heard it was wayyyyyyyy up north

2007-08-03 15:23:51 · 7 answers · asked by daiberino 2 in Geography

My Husband have A+ve and I have B-ve.Will it contribute to any problem during pregnancy??

2007-08-03 15:20:09 · 1 answers · asked by Anonymous in Zoology

its leftmost digit is removed and written again as the rightmost digit. the number thus obtained is twice x. find the decimal representations of all such numbers x

thanks guys

2007-08-03 15:18:48 · 4 answers · asked by Anonymous in Mathematics

2007-08-03 15:09:00 · 12 answers · asked by CR at work 1 in Geography

what kind of force is it? Why does it happen when there is matter.

2007-08-03 15:08:24 · 9 answers · asked by Ryan G 2 in Physics

I have a Xanax prescription for 1 mg tablets. Can I drop one in my beer, and if so, what would happen?

2007-08-03 15:08:22 · 7 answers · asked by Ben 3 in Medicine

***please do explain well.

ARIGATO!!! :-)

2007-08-03 15:02:48 · 3 answers · asked by Anonymous in Physics

I'll give you the question first and I'll show you what I came to....sooo....

A buffer solution is prepared by dissolving NaA and HA in pure water. The Sum of the molarities of NaA and Ha is 2.25 and the pH is 7.50. The Ka for HA is 3.0 x 10^-8. Calculate the molarities of NaA and HA in the solution.
_______________________________

HA + H_2O <=> H_3O^+ + A^- (*NaH*)

pH = pka + log [ A^- / HA]
pka = log^(-Ka) => pka = log^(-3 x 10^-8)
pka= 1

7.50 = 1 + log [ A^- / HA]
6.50 = log [ A^- / HA] => 10^6.5 = [ A^- / HA]
[ A^- / HA] = 3.162 x 10^6
[A^-] + [HA] = 2.50
x + x = 2.50?

then I get lost in translation.... please help.

2007-08-03 15:00:21 · 2 answers · asked by Catcher InTheRye 2 in Chemistry