Science & Mathematics - 8 October 2007

2007-10-08 09:59:28 · 8 answers · asked by lynne 2 in Mathematics

The terminal speed of a sky diver is 160 km/h in the spread-eagle position and 315 km/h in the nosedive position. Assuming that the diver's drag coefficient C does not change from one position to the other, find the ratio of the effective cross-sectional area A in the slower position to that in the faster position.


This is the answer:
3.8759765625


I just need to see how to get to the answer, I know it's simple, but I think I'm missing something THANKS :)

2007-10-08 09:58:17 · 2 answers · asked by Anonymous in Physics

please help me it is due today

2007-10-08 09:57:58 · 2 answers · asked by Anonymous in Mathematics

2007-10-08 09:55:11 · 7 answers · asked by Madison D 1 in Astronomy & Space

Hi all,

What countries are 'active zones'?

Thanks.

2007-10-08 09:54:00 · 2 answers · asked by hannah <33 4 in Geography

And what is its purpose?

2007-10-08 09:53:19 · 5 answers · asked by bmill74 2 in Engineering

2007-10-08 09:51:25 · 4 answers · asked by Amy S 1 in Astronomy & Space

I heard NASA has seen it, and it will be close to earth in 2012 and will cause cataclysms...and stuff.

2007-10-08 09:49:24 · 6 answers · asked by Anonymous in Astronomy & Space

Find the equation in standard fform of the lines through point P that are (a) parallel to, and (b) perpendicular to, line L.

P(0,-2); L:y=x-3

--------------------------------------...
please explain to me how to do this

2007-10-08 09:49:20 · 3 answers · asked by Anonymous in Mathematics

and also

2x^2y - 6xy^2 + 12xy / 2xy

2007-10-08 09:47:35 · 7 answers · asked by Anonymous in Mathematics

this is for my classes so please give me a site or a book with the information if you can and more about them

2007-10-08 09:40:34 · 11 answers · asked by bahama 1 in Zoology

a nonmetal & nonmetal? metal & metal? nonmetal & metal?

2007-10-08 09:39:29 · 3 answers · asked by Anonymous in Chemistry

2007-10-08 09:37:31 · 5 answers · asked by Richard S 3 in Physics

2007-10-08 09:34:08 · 3 answers · asked by Jerith N 3 in Medicine

2007-10-08 09:33:22 · 0 answers · asked by papirazi 1 in Medicine

A. headwaters
B. estuary
C. mouth
D. euphotic zone

2007-10-08 09:30:26 · 8 answers · asked by *:)* 1 in Geography

2007-10-08 09:29:39 · 11 answers · asked by Anonymous in Mathematics

Can anyone help me with this chemistry problem?

"The following ioic compounds are dissolved in water. For each of substances below, identify the ions formed ince dissolved in water. Make sure the reactions are all balanced."

HI (aq) -->

K2(SO3)(aq)-->

Ba(NO3)2 (aq)-->

NH4(OH) (aq)-->

H2(SO4) (aq)-->

2007-10-08 09:29:07 · 1 answers · asked by ace33 1 in Chemistry

2007-10-08 09:25:45 · 3 answers · asked by Anonymous in Geography

then a= and b=

can someone show me how to do this

2007-10-08 09:25:00 · 1 answers · asked by Anonymous in Mathematics

Are they not just the same thing?

2007-10-08 09:24:30 · 2 answers · asked by rhubarbcrumble4 2 in Chemistry

is it carbs? lipids? proteins? or nucliec acids.

2007-10-08 09:23:51 · 1 answers · asked by lion_sun93 1 in Biology

And that they sold the blueprints for the Apolla shuttle to a Russian as memorabilia and forgot to make copies of them and now they can't figure out how to build something that will make it there?

2007-10-08 09:23:22 · 6 answers · asked by Anonymous in Astronomy & Space

Today we were told to revise standard form but some of it I really don't understand. It's probably just a silly misunderstanding but could someone say it in plain and clear.

One of the questions: 52100 in standard form and the answer is 5.21 x 10 to the power of 4.


Our teacher said the dec pl. has to be between 1 - 10. But then wouldn't 52.1 be between one and ten?

Please explain as I have a test!

2007-10-08 09:22:15 · 7 answers · asked by xthedarkladyx 1 in Mathematics

2007-10-08 09:19:51 · 11 answers · asked by shawna 2 in Mathematics

A 4.0 kg block is pushed 4.2 m up a rough 37° inclined plane by a horizontal force of 75 N. If the initial speed of the block is 2.2 m/s up the plane and a constant kinetic friction force of 25 N opposes the motion, ­calculate the following.

a) the initial kinetic energy of the block
=....J
(b) the work done by the 75 N force
=....J
(c) the work done by the friction force
=....J
(d) the work done by gravity
=....J
(e) the work done by the normal force
= 0 J
(f) the final kinetic energy of the block
=....J

2007-10-08 09:19:39 · 1 answers · asked by Nikita 1 in Physics

2007-10-08 09:19:26 · 3 answers · asked by Anonymous in Chemistry

2007-10-08 09:18:20 · 8 answers · asked by Homey 2 in Parapsychology

You may use any of the commonly used operations except 4 factorial. You can ONLY use four 4's. No more, no less. The only digit you can use is 4.

Hint: You can use 4/4, exponents, square root of four, 44, .4, 4 to the square root of 4 power, etc, etc.
The only operation you may not use is 4! (4x3x2x1)

Good luck!

2007-10-08 09:17:09 · 3 answers · asked by ... 2 in Mathematics

I wanna know :-

1/ Element being oxidized and product of the oxisation???

2/ Element being reduced, and product of the reduction??

3/ the net ionic equation for the redox reaction.

Please help me :-(

2007-10-08 09:16:53 · 2 answers · asked by Hippocrates1985 1 in Chemistry