Science & Mathematics - 9 October 2007

What is the period of k(t) = cos(2t/3)? I found the amplitude and phase shift but am not sure how to find the period for this problem.
Also, if 8 is the amplitude, and 2 is the period, and 0 is the phase shift, what is the rule of the periodic function?
Thanks for explaining!

2007-10-09 19:56:54 · 2 answers · asked by Anonymous in Mathematics

So i found a starfish at the beach and i took it out and it didn't dry it just got really soggy. I was wondering how you dry it out so it preserves.

2007-10-09 19:45:53 · 5 answers · asked by Anonymous in Zoology

A, B, C, D, E, and F are all integers and no two are the same integer.
(a) Find values for A, B, C, D, E, and F so that the linear equations Ax + By = C and
Dx + Ey = F have the same solution (−3,4) .
(b) Sketch a graph to represent your two equations.
(c) Is your set of values for A, B, C, D, E, and F unique? Explain how you know.

2007-10-09 19:43:45 · 2 answers · asked by SuperAwesomePhunThyme 1 in Mathematics

I dont know the method to solve this and there is no good web reference that shows me how to step by step solve this. I know what the terms need to look like, but i dont have a really good idea on the method. Can someone please help me, show me or refer me to something that clearly shows the method for working this out. My textbook only dedicates about 2 pages to mclaurin series :(

Best answer gets 10 points immediately

2007-10-09 19:43:31 · 3 answers · asked by cutiemutie9 1 in Mathematics

http://answers.yahoo.com/question/index;_ylt=AsG5R_Ta23TqMtPj8FPuxVjsy6IX;_ylv=3?qid=20071009175400AAcJUFa

All you have to do is look at the answer (468) and tell me how you would have figured it out. Like how you used multiplication or whatever (I know thats not in there but whatever) but I don't want any high schoolish answers like 'Yeah take a then convert it to z^' or whatever. Keep it short and simple. Easiest understood answer is the best answer.

2007-10-09 19:40:01 · 6 answers · asked by ŤεĎĎγкέωŦ 2 in Mathematics

Each liter of an electrolyte solution contains 3.5 g sodium chloride, 1.5 g potassium chloride, 2.9 g sodium citrate (Na3 C6 H5 O7) and 20.0 g glucose (C6 H12 O6).

Calculate the molarity of each species present in the solution.

PLZ HELP.....I dont understand this!

2007-10-09 19:33:27 · 1 answers · asked by sweaty teddy 4 in Chemistry

I need an answer right away so please answer in full detail because i really don't understand this.

What is the molar mass of an ideal gas if a 0.622 g sample of this gas occupiies a volume of 300 mL at 35C and 789 mm Hg?

Ok, so i know i have to make the Celsius to Kelvin, but am i plugging this inter the PV=nRT equation? and what am i looking for?

2007-10-09 19:31:03 · 1 answers · asked by Shookoolate 3 in Chemistry

what if everythings and everyone stop moving and everyone stops thinking...then time would be meaningless...i mean you cant define time anymore when nothing is happening...
do you get my point ???

2007-10-09 19:27:16 · 4 answers · asked by Ali 4 in Astronomy & Space

I figured out the answer for this question through guess and check, but I cannot figure out the equation I need to use to solve the problem.

Bob drove from TownA to TownB, a distance of 250 miles. He increased his speed by 10mi/hr for the 360 mile trip from TownB to TownC. If the total trip took 11 hours, what was his speed from TownA to Town B?

The answer is 50mph, but I cannot figure out how to get this without guess and check. Any help is great. Thanks.

2007-10-09 19:24:44 · 6 answers · asked by Anonymous in Mathematics

a.17/7
b.31/7
c.7/7
d.25/7

2007-10-09 19:22:07 · 12 answers · asked by Monique H 1 in Mathematics

The current through a 3.0mH inductor is being built up from zero by a 1.5V battery. the equivalent series resistance of the circuit is 6.0 ohms.

a) Calculate the inductive time constant?
____________s

b) Calculate the current 2.3ms after the swith is closed.

___________mA


when 250 mA flows through a 3.0 mH inductor switches are thrown so that the current begins to decay with an equivalent series resistance of 6.0 ohms and no battery. Calculate the current 2.3 ms after the switch is closed

_________________mA

2007-10-09 19:18:20 · 2 answers · asked by Foxx 1 in Physics

2007-10-09 19:17:39 · 6 answers · asked by ndungupatoh 1 in Physics

2007-10-09 19:17:30 · 2 answers · asked by chase_thepyro 1 in Chemistry

can you factor xu out of sqrt[(x^2) + (x^2)(u^2)]

ifyou can then how??

2007-10-09 19:14:01 · 3 answers · asked by garlin104300 1 in Mathematics

Please help.



Where is this element most abundant?

Are there any disadvantages or dangers for uses this element?


Are there any negative side effects to producing/using/extracting this substance?

When is it used the most?


How is it used?

2007-10-09 19:12:57 · 1 answers · asked by Saм 2 in Chemistry

Calculate the average value of Φ for the particle-on-a-ring system. The wavefunctions are Ψ(Φ) = 1/√2 * e^(imΦ) m = 0,+/-1, +/-2...

I know I should set up an equation like this:
∫ (-∞ --> ∞) Ψ(Φ)* Φ(hat) Ψ(Φ) dΦ

Except I have no idea what Φ(hat) is..?

THANK YOU SO MUCH IN ADVANCE!!!!!!

Love,
Mary ♥

2007-10-09 19:10:17 · 2 answers · asked by ♥ Mary ♥ 3 in Chemistry

Is it true that we only use 10% of our brain?
If thats true what do you think we could do if we used more?

2007-10-09 19:10:09 · 4 answers · asked by Anonymous in Medicine

The Grand Coulee Dam is 1270 m long and 170 m high. The electrical power output from generators at its base is approximately 1920 MW.
How many cubic meters of water must flow from the top of the dam per second to produce this amount of power if 93.0 \% of the work done on the water by gravity is converted to electrical energy? (Each cubic meter of water has a mass of 1000 {\rm kg}.)

2007-10-09 19:09:54 · 3 answers · asked by Madiyar T 1 in Physics

???????????????????

2007-10-09 19:09:42 · 2 answers · asked by KittyMeowGrrrr 5 in Mathematics

Calculate the average value of Φ for the particle-on-a-ring system. The wavefunctions are Ψ(Φ) = 1/√2 * e^(imΦ) m = 0,+/-1, +/-2...

I know I should set up an equation like this:
∫ (-&inf; --> &inf;) Ψ(Φ)* Φ(hat) Ψ(Φ) dΦ

Except I have no idea what Φ(hat) is..?

THANK YOU SO MUCH IN ADVANCE!!!!!!

Love,
Mary ♥

2007-10-09 19:09:36 · 2 answers · asked by ♥ Mary ♥ 3 in Chemistry

mixture called suspension
mixture called solution
solution and a suspension
mixture only

2007-10-09 19:07:25 · 4 answers · asked by Anonymous in Chemistry

The number of typo errors in textbooks follow the Poisson distribution with a mean of 1.5 per 100 pages. A teacher selects 400 pages of the textbook, what is the probability that there are 4 or more typo errors ?

2007-10-09 19:06:02 · 2 answers · asked by Zac 2 in Mathematics

what hepand do it? dog see the image of meat in th water,? he dropped the meat in to the deep water and snatched in vain at the shdow"""""""""

2007-10-09 19:03:53 · 10 answers · asked by Anonymous in Zoology

It says the atom's reactivity level depends on the amount of electrons since one type of element always has that same proton number anyways..

however, isotopes is an element w/ same number of protons but differnt number of neutrons...does that determine the reactivity too?

....can someone just clear that up for me?
thank you

2007-10-09 19:00:43 · 3 answers · asked by ioaewjfkl 1 in Biology

I'm just wondering if the two mentioned compounds are pertaining to the same substance. I hope someone could clarify this; back-up explanation will be much appreciated. Thanks!

2007-10-09 19:00:29 · 1 answers · asked by ^_^ 1 in Chemistry

2007-10-09 19:00:14 · 3 answers · asked by Anonymous in Physics

I seriously am stuck at this one problem right now. It is:

If f(2) = 3 and f'(2) = 5, find an equation of the tangent line, and the normal line to the graph of y = f(x) at the point where x = 2.

I know that there is an equation to use. I tried it, but I keep getting the wrong answer from the book. Can anyone please help me?

2007-10-09 18:59:26 · 3 answers · asked by bratty808gurl 1 in Mathematics

A tire placed on a balancing machine in a service station starts from rest and turns through 4.7 revolutions in 1.1 s before reaching its final angular speed. Calculate its angular acceleration.
____rad/s2

2007-10-09 18:58:17 · 1 answers · asked by burkehud 2 in Physics

2007-10-09 18:57:11 · 15 answers · asked by Anonymous in Mathematics

Are these anything like polar coordinates or cylindrical coordinates?

2007-10-09 18:57:07 · 1 answers · asked by PT109 1 in Astronomy & Space