Science & Mathematics - 29 November 2007

The number of times a cricket chirps in a minute is a function of the temperature. You may use this formula:

n = .25n + 40

to determine the number of chirps, n, a cricket makes in a minute when the temperature is f degrees in fahrenheit. If you want to estimate the temperature by counting cricket chirps, it is easier to use the following form of the equation:

t = .25n + 40

I NEED HELPPP!

2007-11-29 13:59:27 · 1 answers · asked by Anonymous in Mathematics

2007-11-29 13:59:17 · 1 answers · asked by Anonymous in Mathematics

so i have a final coming up in my chem. lab and i have been stumped on a few of the study material problems... by any chance can you help me with them? try to show your work as much as possible i need to figure out how to do them so i will be able to do them on the final as well. thanks everyone who helps me out with these...

1) A sample of 16.78 mL of 0.103 N H2SO4 is titrated with 0.177 N NaOH.

a) how many mL of NaOH will it take to reach the endpoint?
b) What is the molarity of the H2SO4 solution?
c)How many grams of NaOH will it take to reach the endpoint?

2) What volume will 4.4 grams of CO2 gas occupy over water at 30 derees Celcius and a barometric pressure of 700mm?

I will really appreciate any help offered with the two problems thank you once again!

2007-11-29 13:59:12 · 4 answers · asked by It can only be me! 1 in Chemistry

We recently found this caterpillar crawling along the drive way. We havenever seen anything like it and the kids wantto know what it is, We put it in a bug catcher with some grass and it seems to be forming some sort of web around the grass. it is actually starting to look like a cocoon. when he is spread out, he is probably about 10015 cm's long and about 1.5 cm's in width. he is very hairy and looks like he has spikes on him. he is mostly brown but has these yellow dots on his back. his little legs look like little suckers. Does anyone have any idea what it is?

2007-11-29 13:58:09 · 2 answers · asked by Anonymous in Zoology

well i have a math problem and it says carey rode his bicycle miles in 1 and a half hours what was his average speed??

i need an answer but most importantly how to do it .

2007-11-29 13:57:35 · 2 answers · asked by VICTOR P 2 in Mathematics

2007-11-29 13:56:36 · 3 answers · asked by Jon 1 in Medicine

2x + 24y = -176
11x + 6y = 40

2007-11-29 13:55:06 · 4 answers · asked by derrim2000 1 in Mathematics

how would you solve: 9(1.03)^t=11(1.02)^t

2007-11-29 13:54:13 · 4 answers · asked by Anonymous in Mathematics

question/statment
those yummy chicken wings you eat are often served with celery. In order to keep the celery nice and crispy, it would be best to place it in which solution (as compared to the celery). a hypertonic solution, hyotonic solution or an isotonic solution?

2007-11-29 13:53:00 · 2 answers · asked by xxzeldagirlxx 1 in Biology

2007-11-29 13:51:57 · 6 answers · asked by Anonymous in Mathematics

2007-11-29 13:51:41 · 2 answers · asked by dudefjeld 1 in Chemistry

how long does it take or will soma show up on drug tests at all>

2007-11-29 13:49:03 · 2 answers · asked by gabriela 1 in Medicine

Are bananas genetically altered with any animal DNA?

2007-11-29 13:46:38 · 2 answers · asked by Anonymous in Botany

*form a quadratic equation whose roots are 1/2(2+i) and 1/2(2-i)
*determine the nature of the roots of the quadratic equation 4x2+12x+9=0
*find the solution set: x/x+1 +5/8 = 5/2(x+1) + 2/4
*word problem: a jet plane traveling at a rate of 550 mph overtakes another plane that had a 3 hour head start and is travelling at a rate of 250 mph. how far from the starting point does the jet overtake the other plane?
*give the function of least possible degree whose roots are 1+2i, 1-2i, 2+-square root of 5, -3
*solve the linear system by Cramer's rule: x+3y=7 , y+z=5 , 2x-4z= -10
*word problem: a cyclist traveled a certain distance at her usual speed. if her speed had been 2mi/hr faster, she would have traveled the ditance in 1hr less time. if her speed had been 2mi/hr slower, she would have taken 2hrr longer. find the distance traveled and her ususal speed.

-p.s can anyone solve this..? PLEASE!

2007-11-29 13:44:47 · 2 answers · asked by jazZ 1 in Mathematics

These are the math terms: ngttnae and nfifcoar

2007-11-29 13:44:01 · 4 answers · asked by Patches 2 in Mathematics

Cyclohexanol has a heat of vaporization of 54 kJ/mol and the absolute entropies of the liquid and gas are 200 and 328 J/K-mol, respectively. Which of the following is false?



a. The entropy of vaporization is positive.
b. The heat of formation of liquid cyclohexanol is less than that of the vapour.
c. At 80oC the free energy change for the vaporization is negative.
d. At the boiling point the free energy change for vaporization is zero.
e. At 80oC, cyclohexanol vapour spontaneously condenses into a liquid.



help please

2007-11-29 13:43:46 · 2 answers · asked by Anonymous in Chemistry

I need to know how to find "c" and "b" in the following equation: y=a sin(bt-c)+d.

I know that a = radius, d = radius + feet off ground, but I do not know how to find B or D. Also a cosine equation will work so please tell me how to do the following problem:

Ferris wheel with a radius of 125, it is 133 from center of ferris wheel to ground. Does a revolution every 60 seconds.

2007-11-29 13:43:42 · 1 answers · asked by Anonymous in Mathematics

2007-11-29 13:43:08 · 1 answers · asked by Withnie L 1 in Earth Sciences & Geology

This is from a packet that my chem. teacher gave me as homework that is due tommorow. We did a lab on the alkali metals, which react to water. Sodium and Potassium are both alkali metals.

PLEASE HELP!

2007-11-29 13:42:19 · 3 answers · asked by oh.emgeeitzjesska 1 in Chemistry

2007-11-29 13:41:21 · 1 answers · asked by msboobjob2004 1 in Engineering

a) evaluate the antiderivative of f(t)= 1/(t^(2)+1)?

and...

b) evaluate the antiderivative of f(x)= x+ (4/sqrt(x))?

and...

c) find the antiderivative of f(x)= e^(t) + e^(5)?

2007-11-29 13:41:11 · 2 answers · asked by wildcat11 1 in Mathematics

A water rocket, launched from the ground, rises vertically with acceleration of 30 m/s^2 for 8.7 s when it runs out of "fuel". Disregarding air resistance, how high will the rocket rise?

Steps Please. Thanks =)

2007-11-29 13:40:02 · 1 answers · asked by kickitup21 1 in Physics

I am so sad today. I feel, like with the great competitive nature of today's medical schools, I have no chance of getting in. All my dreams of becoming a doctor is disintergrating in front of my eyes. There seems to be no hope.

2007-11-29 13:39:34 · 8 answers · asked by Anonymous in Medicine

2007-11-29 13:37:45 · 4 answers · asked by khaye 1 in Chemistry

2007-11-29 13:37:42 · 1 answers · asked by Oma 1 in Chemistry

2007-11-29 13:37:14 · 0 answers · asked by Oma 1 in Chemistry

There are no Rocky Mountain Locusts left. Did the homesteaders win or lose?

2007-11-29 13:37:00 · 2 answers · asked by Anonymous in Other - Science

There are no Rocky Mountain Locusts left. Did the homesteaders win or lose?

2007-11-29 13:36:36 · 1 answers · asked by Anonymous in Biology

44 grams of water at 16 Degrees C is mixed with 450 grams if ice at -16C. what mass of water freezes? what is the change in entropy of the system? ( The heat capacity of water is 4190 J/Kg , that of ice is 2090 J/Kg, and the heat of fusion of water is 3.34 x 10^5 J/Kg.)

2007-11-29 13:36:26 · 1 answers · asked by Anonymous in Physics

2007-11-29 13:35:44 · 4 answers · asked by derrim2000 1 in Mathematics