Science & Mathematics - 7 January 2007

Now my cough reflex is still not gone 2 whole weeks after the cold symptoms including phlegm have disappeared. It feels itchy like there is a little water in my lungs, upper bronchol tubes. Did I injure my lung area somehow and will it go away or should I get help?

2007-01-07 16:01:08 · 3 answers · asked by Ilooklikemyavatar..exactly 3 in Other - Science

In a private lake, 200 fish are stocked and the population grows according to the logistic function: P(t) = 2000 / (1 + 9e^(-t/3)) where t is in months.

At what time is the population growing the fastest? How many fish are there at this time?

2007-01-07 16:00:23 · 2 answers · asked by Taryn 2 in Mathematics

I've heard that their is a formula of which top astronomers concur that produces a factor indicating an expected number of planets presently supporting intelligent biologically life in a giving area, for example 10000 for our galaxy and whatever for others and whatever raised to thrice whatever for our universe. What's it called? The 'm' factor or number or something like that. Now since most stars and therefor planets are towards the center of the galaxy and earths subgalactic proximity is roughly three quarters of the way out along the galactic radius then really 2500 of those planets would about the same galactic orbit as us and half of them are on the opposite side of the galaxy... Then 1250 planets would be avaible to us electromagnetically. In a larger galaxy like ours the journey would still take 12500 light years accounting for the 100000 light year diameter of the Milky Way. By this can we infer that only one planet is within 100 light years?

2007-01-07 15:59:52 · 1 answers · asked by shadyyak 1 in Astronomy & Space

you reach into the jar and without looking, remove 2 jelly beans. what is the probablity that you will remove 2 pink jelly beans?

2007-01-07 15:58:49 · 5 answers · asked by Anonymous in Mathematics

With everyone using up the Oil supplies under the earth, is their any way oil can replenish or regenerate. Isn't oil from decaded dinosaurs or something?

2007-01-07 15:58:43 · 4 answers · asked by casinoman_1999 2 in Earth Sciences & Geology

2007-01-07 15:58:15 · 3 answers · asked by shashikant g 1 in Physics

Basically, I am quitting Engg. to do a Physics Ph.d. because i like to learn Physics. I want to do a Ph.d.... so before I take the plunge, i wanted to know if you know of a downside to doing a Ph.d. Physics?

2007-01-07 15:57:58 · 8 answers · asked by khoj_badami 2 in Physics

For what value of x does the tangent line to y = ln(3x) at x=2 cross the x-axis?

2007-01-07 15:57:40 · 6 answers · asked by Taryn 2 in Mathematics

please answer ASAP! :]

2007-01-07 15:57:21 · 7 answers · asked by annonymous 2 in Mathematics

2007-01-07 15:56:45 · 6 answers · asked by Anonymous in Chemistry

A juice drink manufacturer has found mixing kiwi juice concentrate and fresh squeezed orange juice is the most cost effective way to produce its breakfast beverage. the kiwi juice comes in two concentrated foms, 17% and 30% kiwi juice, whice must be combined into a solution that can be mixed with the orang juice. if 50 gallons of 17% juice is used, how many gallons of the 30% juice must be used to obtain a 20% kiwi juice solution?

i dont get this at all!!! so much words are used in this and it is very confusing for me!!! T-T . please explain step by step for me to get it!! thanks!!!

2007-01-07 15:55:51 · 3 answers · asked by Orange? 4 in Mathematics

2007-01-07 15:54:06 · 4 answers · asked by no_way_jose_15960 2 in Geography

how can it be endless? it's hard to imagine.

2007-01-07 15:53:11 · 6 answers · asked by nodamnway 4 in Astronomy & Space

I've been staring at this problem for an hour and going over my notes but I can't figure out how to start it off. Can someone help me out please and maybe give me a first step?

problem:

prove the identity

cos²x-sin²x=1-2sin²x

2007-01-07 15:51:47 · 2 answers · asked by wingedcub 1 in Mathematics

2007-01-07 15:51:07 · 3 answers · asked by Anonymous in Chemistry

How many pounds of gourmet candy selling for $2.00 per pound should be mixed with 6 pounds of gourmet candy selling for $3.00 per pound to obtain a mixture selling for $2.60 per pound?

please explain step by step thanks!!! and for some reason my answer came out to be 1.55 lb T-T which is SOO wrong!!! and do you know any tricks to make this problem easier for you? if so tell me pls!

2007-01-07 15:49:47 · 6 answers · asked by Orange? 4 in Mathematics

2007-01-07 15:49:20 · 11 answers · asked by steven d 1 in Medicine

I'm 13 years old and I got 127 on my IQ test and it says I'm a visual mathematician I don't really understand what's that supposed to mean.But I've tried looking for the rankings but most of them are for adults 20+ year olds

2007-01-07 15:47:24 · 8 answers · asked by Yoshi! =] 1 in Mathematics

how do our voices transform into electric energy in the telephone when we talk

2007-01-07 15:46:14 · 1 answers · asked by kt 2 in Physics

2007-01-07 15:44:37 · 6 answers · asked by lim e 1 in Engineering

i keep getting [(-2x-1)(x-6)]/[(x+5)(x+2)] but the answer says it is just (-2x-1)/(x+5). is my answer right or is the given answer right?

2007-01-07 15:42:29 · 2 answers · asked by hannah p 2 in Mathematics

When I've been prescribed pain medications like lortab or percoset they don't help. Is there a recognized reason for this? I never take medications not even over the counter so it isn't a built up tolerance. Is there a different class of pain killers that react in a different way with your body that may work better?

2007-01-07 15:41:47 · 6 answers · asked by TMS 3 in Medicine

Find the average value of the function N(t) = 200e^(kt) on the interval [2,7]. Include an integral and appropriate units.

2007-01-07 15:40:59 · 4 answers · asked by Taryn 2 in Mathematics

2007-01-07 15:40:46 · 3 answers · asked by John 1 in Mathematics

2007-01-07 15:39:41 · 4 answers · asked by John 1 in Mathematics

Find the area bounded by f(x) = e^(sinx), the x-axis and the lines x = -2 and x = 3. Show the integral that supports your answer.

2007-01-07 15:39:37 · 2 answers · asked by Taryn 2 in Mathematics

On the interval [1, 7], find the value of x that divides the area under y = (1/x) and above the x-axis, into 2 equal areas. Write an integral expression or equation that supports your answer.

Please help!!

2007-01-07 15:38:38 · 2 answers · asked by Taryn 2 in Mathematics

i dont understand this question: how many different 4-person relay teams can be chosen from 8 students? i have to list all of the combinations


thank u in advance, this is hard for me.

2007-01-07 15:37:23 · 10 answers · asked by lexa (: 4 in Mathematics

yeah...?

2007-01-07 15:37:18 · 8 answers · asked by Anonymous in Physics

I'm running an experiment and need web links or advice how to build a 240 mains (I'm in Australia) power supplyso I can power a high powered car head light running between 9-16v @ 3.2-20A I need to build one

2007-01-07 15:37:14 · 4 answers · asked by Navyant 2 in Engineering