Science & Mathematics - 13 October 2007

If a solution of [M_o(NH_3)_6] Cl_3 has an absorbance of 1.21 when measured in a cell with a path lenght of 1.20 cm, what is it's concentration? The molar absorptivity at the wavelenght at which the measurement was obtained is 130 M^-1 cm^ -1

_# means that # is a subscript

^# means that # is a power

2007-10-13 11:12:28 · 1 answers · asked by Anonymous in Chemistry

2007-10-13 11:12:01 · 9 answers · asked by Sinisa g 1 in Astronomy & Space

I need help simplifiying: 3x+6 divided by Xsquared - 4

PLEASE HELPPPP

Thank you in advance x :)

2007-10-13 11:11:00 · 7 answers · asked by x Animal Lover x 2 in Mathematics

2007-10-13 11:08:42 · 3 answers · asked by Anonymous in Earth Sciences & Geology

2007-10-13 11:05:24 · 35 answers · asked by superpug92 2 in Zoology

show that the functions f=1/x, g=(x-1)/x generate a group of functions, the law of composition being composition of functions, which is isomorphic to the symmetric group S_3.

2007-10-13 11:03:52 · 2 answers · asked by greenheaven 1 in Mathematics

i have to do electron dot structures for these molecules.
i think i got the answers to most of them, but im not sure.
it says to include all resonance structures.
can someone explain what that is.

methane CH4.
ethane C2H6
methanol CH4O
ethanol C2H6O
carbonate ion CO3 2-
silicon dioxide SiO2
nitrous oxide N2O
sulfate ion SO4 2-
phosphate ion PO4 3-
sulfur dioxide difluoride SO2F2

obv. you cant type this out..
but does anyone know of a website(s) that would have the answers.
please send all of the links.
first person with all links gets 10pts.

2007-10-13 11:01:55 · 2 answers · asked by Anonymous in Chemistry

A particle moves horizontally in uniform circular motion, over a
horizontal xy plane. At one instant, it moves through the point at coordinates (4.00 m,
4.00 m) with a velocity of iˆ 00 . 5 − m/s and an acceleration of jˆ +12.5 m/s2. What are the
(a) x and (b) y coordinates of the centre of the circular path?

2007-10-13 11:01:17 · 2 answers · asked by pat l 2 in Physics

Experiments with calcium show that it will emit electrons if light above 6.55*10^14 Hz is used. What is the kinetic energy of an electron when light with frequency of 7.26*10^14 Hz shines on the surface?

Thanks

2007-10-13 10:55:14 · 1 answers · asked by RelientKayers 4 in Chemistry

2007-10-13 10:51:16 · 1 answers · asked by . 6 in Biology

do we have chlorine in our water?

what states do and dont? cities? etc.

2007-10-13 10:50:46 · 2 answers · asked by gnomewithonesock 1 in Earth Sciences & Geology

The exact question:

What is the greatest possible number of points of intersection between a parabola and a circle?

The answer is 4, but I don't know how to get it.

I tried equating the circle and parabola equations, but that gave me 2 points, not 4.

Thanks!

2007-10-13 10:50:39 · 5 answers · asked by A B 2 in Mathematics

What should be the spring constant k of a spring designed to bring a 1200 kg car to rest from a speed of 95 km/h so that the occupants undergo a maximum acceleration of 5.0 g?
=.........N/m

2007-10-13 10:47:44 · 1 answers · asked by Nikita 1 in Physics

2007-10-13 10:42:03 · 5 answers · asked by APerfectCircle 2 in Mathematics

2007-10-13 10:41:10 · 3 answers · asked by ladiamondprincess 2 in Mathematics

This problem has confused me for awhile now.

A baseball is thrown at an angle of 25 degrees relative to the ground at a speed of 23.0 m/s. If the ball was caught 42.0 m from the thrower, how long was it in the air? How high was the tallest spot in the ball's path?

2007-10-13 10:36:14 · 2 answers · asked by redalert 2 in Physics

How much the extra work is required to stretch it an additional 11.5 cm? Answer in units of J.

2007-10-13 10:35:35 · 2 answers · asked by mira s 1 in Physics

explain the process by which you came to your conclusion

2007-10-13 10:35:33 · 4 answers · asked by Anonymous in Mathematics

how many electrons are in Ca2+???

2007-10-13 10:33:36 · 7 answers · asked by frizzy_ghost 1 in Chemistry

2007-10-13 10:32:58 · 3 answers · asked by navya 1 in Physics

I believe that time is an energy-related function that is asymptotic, that is, it has a limit that does not allow traveling backwards in time. "Time travel" can only occur when you accelerate such that time begins to occur more slowly for you than for everyone else, therefore you are in effect "traveling to the future." This is in agreement with relativity and with what others say. You can accelerate as much as possible, traveling farther into "the future," but NEVER into the past, and when you stop you reach (I wouldn't call it "transport" into) a time in the future relative to the time that elapsed for everyone else. Since you were absent from any period in between (you were "time traveling"), and you arrive at a future endpoint, no paradox can exist. There are NO two of you at any one time. You only exist where you are whenever you are: in the current time, "time traveling" faster relative to everyone else, or at the future endpoint after you finished your "time travel." Opinions?

2007-10-13 10:32:26 · 5 answers · asked by Liquidator1 3 in Physics

A 85 kg trampoline artist jumps vertically upward from the top of a platform with a speed of 3.0 m/s. (Ignore small changes in gravitational potential energy.)

(a) How fast is he going as he lands on the trampoline, 3.0 m below?
= 8.234 m/s

(b) If the trampoline behaves like a spring with spring stiffness constant 5.2 104 N/m, how far does he depress it?
=.........m

- Please help me how to do part b, i already got part a, which is right, but i don't get how to find part b, so please if you could help me, i would really appreciate it, Thanks :)))))

2007-10-13 10:32:24 · 5 answers · asked by Nikita 1 in Physics

What is the kinetic energy of the ball at the highest point of its motion? Answer in units of J.

2007-10-13 10:31:59 · 1 answers · asked by mira s 1 in Physics

A ball of mass .150 kg is dropped from rest at a height of 1.25m. It rebounds from the floor to reacha height of .960 m. What impulse was given to the ball by the floor?

2007-10-13 10:31:39 · 1 answers · asked by Ashley P 1 in Physics

u+12/u^2 + u+2/3u???

2007-10-13 10:30:15 · 3 answers · asked by mariacruztexas 1 in Mathematics

CAn any of u give Tell me a biological discovery dealing with Biochemistry and the person who discovered it??

2007-10-13 10:29:11 · 2 answers · asked by Anonymous in Chemistry

i have to do a report on how newton's laws apply with gravity and i have a good idea but i dont have enough to write a repot on it... Any Help?

2007-10-13 10:27:59 · 2 answers · asked by Anonymous in Physics

2007-10-13 10:26:19 · 3 answers · asked by dnab16 2 in Mathematics

is biology more advance and better???

2007-10-13 10:25:28 · 9 answers · asked by ♠durr♠ 2 in Earth Sciences & Geology

x+y=28
xy=7
find 1/x+1/y

note: x value is the same through out the whole problem and so is the y value

2007-10-13 10:21:53 · 2 answers · asked by Anonymous in Mathematics