Science & Mathematics - 14 July 2007

[Selected]: All categories ➔ Science & Mathematics

Agriculture · Alternative · Astronomy & Space · Biology · Botany · Chemistry · Earth Sciences & Geology · Engineering · Geography · Mathematics · Medicine · Other - Science · Physics · Weather · Zoology

0 ⤊

Is it bad to take hormones (birth control pills) for acne?

i take diane-35 which contains 2 mg cyproterone acetate (an anti-androgen) and 35 mcg ethinyl estradiol for 21 days with a 7 day break. im not sexually active yet so i only take it for my acne..i was just wondering if i should take two a day to make my acne go away faster?

i'm 15/f/have irregular periods and im a healthy weight (even though ive gained 2 lbs after going on diane-35)

is it bad to take too much hormones? what are the side effects?

2007-07-14 15:28:50 · 8 answers · asked by Nina 1 in Medicine

2 ⤊

What does r represent in the polar form equation?

Hi
in the polar form equations r= (ep)/(1+esin(theta)) and etc, what does that "r" represent?
does it have to do with vertices or smth?
Thank you for your help!

2007-07-14 15:22:23 · 5 answers · asked by Chuckles 1 in Mathematics

1 ⤊

What is the difference, if any, between roaches and water-bugs?

2007-07-14 15:20:20 · 3 answers · asked by kat7899 2 in Zoology

0 ⤊

Ostriches cannot fly. Would you expect them to have more down feathers OR contour feathers? Why?

2007-07-14 15:12:07 · 3 answers · asked by Anonymous in Biology

3 ⤊

Mammals and birds tend to eat much more, relatively, than other vertabrates. Why?

2007-07-14 15:10:45 · 3 answers · asked by Anonymous in Biology

5 ⤊

Why are dolphins considered mammals and not as fish? And what are 2 characteristics they share with mammals?

2007-07-14 15:08:01 · 20 answers · asked by Anonymous in Biology

0 ⤊

Some Algebra 2 questions. help?

1.) Solve: 0=8/11y-40
2.)4(2x-3)=6-(3-2x)
3.)Solve for P: A=P+Prt
4.)5(2-1/2x)=4-(1/4x-1)
5.)Solve for z: y^2z+7z=y
6.)Solve for F: C=5/9(F-32)

2007-07-14 15:07:45 · 5 answers · asked by Jessica 3 in Mathematics

5 ⤊

Why were bridges covered back in the 1800's?

2007-07-14 14:49:17 · 7 answers · asked by lovereds1127 1 in Engineering

2 ⤊

How does an electric buzzer make sounds?

2007-07-14 14:48:24 · 4 answers · asked by hello 1 in Engineering

0 ⤊

Will lightning toast you in this situation?

You are riding a bicycle aross a field when lightning strikes the field. Will you get electrocuted due to your bicycle's metal frame? Will the rubber tires insulate you from the intense shock? Or, is there some other reason why you will or will not get toasted?

2007-07-14 14:44:16 · 6 answers · asked by Anonymous in Physics

5 ⤊

is this factorable?

3x^2 + 11x -8?
just answer me with a YES or NO. cause i've been solving this and yet i can't get the factors.

2007-07-14 14:42:36 · 6 answers · asked by rapidgirl 2 in Mathematics

0 ⤊

Is hell endothermic or exothermic?

must provide detailed scientific reasoning

2007-07-14 14:37:32 · 7 answers · asked by Steve25e 1 in Physics

3 ⤊

Can granite rock record sound?

I heard that granite, being magnetic has the properties to record some vague sound? Is this true?

2007-07-14 14:34:29 · 7 answers · asked by Anonymous in Earth Sciences & Geology

1 ⤊

Do our broadcasts (TV + Radio) travel into space?

Do our broadcasts (TV + Radio) travel into space? Could they effectively be picked up by other planets?

2007-07-14 14:31:39 · 20 answers · asked by Anonymous in Astronomy & Space

4 ⤊

i am deeply arfraid of spider so, What is the best way to keep spiders out of a room?

2007-07-14 14:31:29 · 19 answers · asked by the kid 121 2 in Biology

0 ⤊

What time is right now where you are and which country.?

It is Sunday 15th july ,02.30am here in Scotland

2007-07-14 14:29:55 · 32 answers · asked by Anonymous in Geography

0 ⤊

test for convergence or divergence and give rule?

can someone help me out on testing series for convergence or divergence? Please give the rule used too.

1. sum (1 to infinity) of (5^n)n!/(n^n)

2. sum (0 to infinity) of (n^4)/n!

3. sum (1 to infinity) of ((n!)^2) / (2n)!

4. sum (1 to infinity) of ((n-2)/n)^4n

5. sum (1 to infinity) of 4/(n^3 +5)

6. sum (1 to infinity) of 1/(sqrt(n^2 +1))

7. sum (1 to infinity) of 5/(4^n +3)

8. sum (1 to infinity) of (ln n^6) / (3n^5)

Any help on these will be appreciated.

Thanks,

Mark

2007-07-14 14:27:43 · 2 answers · asked by Mark 2 in Mathematics

4 ⤊

are all balls round?

2007-07-14 14:26:11 · 8 answers · asked by STORMY K 3 in Engineering

7 ⤊

Where does NASA get there money from?

Do they get it from taxes? If so don't we (taxpayers) have a right to say that spending trillions of dollars to see if there is life on other planets to much. It just makes me a lil mad because there is so much that could be done with that money that is really needed like running water and medications and food all kinds of things.....

2007-07-14 14:25:07 · 21 answers · asked by Anonymous in Astronomy & Space

0 ⤊