Science & Mathematics - 6 September 2007

A -mile track for racing stock cars consists
of two semicircles connected by parallel straightaways (see
the figure). In order to provide sufficient room for pit crews,
emergency vehicles, and spectator parking, the track must enclose an area of 100,000 square feet. Find the length of the
straightaways and the diameter of the semicircles to the nearest foot. Recall: The area A and circumference C of a circle of diameter d are given by A= pie times diameter squared divided by 4 and c= pie times diameter

i have no clue where to even start I am lost...
I dont expect the anwser
if someone could just explain to me how to get it into a number problem and out of a word problem and set it up so its ready to be solved...

as much details as possible would be great so i can understand it better... thanks a bunch for anyone that takes the time to help me... out... algebra will be the death of me

2007-09-06 09:49:15 · 4 answers · asked by Anonymous in Mathematics

2007-09-06 09:49:14 · 13 answers · asked by steph-dawg 2 in Astronomy & Space

1M copper(ii) sulfate, a copper strip and a coin? I'm guessing the coin is made out of silver

2007-09-06 09:46:29 · 0 answers · asked by mrsjoshgroban 1 in Chemistry

how to solve this??

2007-09-06 09:45:31 · 2 answers · asked by akyl_riza 2 in Mathematics

in boiolgy my class is doing a cell diagram and i am responisable for the Rough Endoplasimic Reticulum and Smooth Endoplasimic Reticulum. i was thinking of doing it on stiro foam but does anybody have anyother ideas (it needs to be big and 3D and in a circle.)

2007-09-06 09:44:55 · 2 answers · asked by Anonymous in Biology

HELP
How do I find the sequences?
-1, 0, 3, 8, 15, 24,
0, 3, 8, 15, 24, 35

2007-09-06 09:40:45 · 12 answers · asked by Jilly C 2 in Mathematics

2007-09-06 09:38:51 · 5 answers · asked by la la la 2 in Mathematics

2007-09-06 09:38:48 · 2 answers · asked by lilak95 1 in Chemistry

Does anyone know what 6(6)*2 x 9= ? This * is a divide sign * or just pretend like it is. this *

2007-09-06 09:38:12 · 5 answers · asked by hotpinkkatharyn 1 in Mathematics

A projection is launched from the ground with speed of 20m/s at the angle 53 degrees above the horizontal towards a high vertical wall 26m away. How high in meters above the ground does the projection strike the wall?

Is it 6.7 meters?

2007-09-06 09:36:25 · 3 answers · asked by Kayla G 1 in Physics

Exponential decaying substance decreases by 32% in 10 hours. What is the half life of the substance?

2007-09-06 09:35:55 · 2 answers · asked by TD 1 in Mathematics

We put two wires attached to a 9 volt battery in a solution of water and household salt. The immediate effect was the forming of a small amount of white/grey substance off the wires, then the water turning slightly yellow. On settling the water is now colourless with a deposit of gold coloured mattered at the bottom of the glass. Could you give me a chemical equation of what has happened?

2007-09-06 09:33:37 · 2 answers · asked by Anonymous in Chemistry

"An object is displaced 25km south-east and then 40km North direction 30 degrees North of East. Find the angle in degrees that the displaced vector makes with east."

Is it 12 degrees?

2007-09-06 09:32:52 · 3 answers · asked by Kayla G 1 in Physics

Is it:

HNO3 + Zn0 ----> ZnNO3 + H2O?

2007-09-06 09:32:24 · 2 answers · asked by Anonymous in Chemistry

The tower has to stand by itself for at least 10 seconds.

2007-09-06 09:31:02 · 9 answers · asked by Anonymous in Physics

2007-09-06 09:29:32 · 5 answers · asked by Amanda M 1 in Chemistry

I know that 2 physical properties are needed for sound: mass and elasticity and I know why masss is need I'm just confused why elasticity is.

2007-09-06 09:28:27 · 2 answers · asked by dancer131 1 in Physics

I just dont understand what the things in the brackets meant. And then whats the difference?

2007-09-06 09:26:50 · 9 answers · asked by Anonymous in Chemistry

"A car is traveling at 45m/s and passes a truck. Two seconds later and with acceleration (2 m/s^2) the truck starts after the car. How long in seconds does it take to catch the car?"

I think it might be 32.7 seconds. Am I right?

2007-09-06 09:26:40 · 2 answers · asked by Kayla G 1 in Physics

huh

2007-09-06 09:26:03 · 11 answers · asked by Loraine M 1 in Earth Sciences & Geology

2007-09-06 09:25:00 · 5 answers · asked by Keith S 1 in Mathematics

Counting Numbers - AKA NATURAL NUMBERS. Are represented by 1,2,3...

Zero isnt a counting number. By combining 0 with all the counting numbers you form whole numbers. They are represented by 0,1,2,3...

QUESTION:
Use the set of whole numbers & indicated symbol to fine whole number answers. Please show work.

1.) 4+8=?*
2.) 4-8=?
3.) 4 x 8 =?
4.) 4 divided by 8 =?

* What do I write? Do I write 0,1,2,3,4,5,6,7,8,9,10,11,12?
Or do I write 12 only?

2007-09-06 09:23:39 · 4 answers · asked by Anonymous in Mathematics

I need help relating these into one large equation:

V=3b P=(a/27b^2) T=(8a/27Rb)

2007-09-06 09:21:27 · 1 answers · asked by Kiss M 1 in Chemistry

Explain

2007-09-06 09:21:24 · 12 answers · asked by brady s 1 in Mathematics

I have just a few questions for you:
1. What does PIC stand for?
2. What is it used for?

Anything else helpful about the PIC microcontroller would be great. Thank you!

2007-09-06 09:21:00 · 2 answers · asked by Ducky 3 in Engineering

The diagram: http://i164.photobucket.com/albums/u32/Codefusionlab/diagram.jpg shows a sector AOB of a circle O and radius r. The angle AOB is α radians, where 0 < α < π. The area of the triangle AOB is half the area of the sector.

(i) Show that α satisfies the equation:
x = 2 sin x.

(ii) Verify by calculation that α lies between π/2 and 2π/3.

(iii) Show that, if a sequence of values given by the iterative formula:
x = 1/3(x + 4 sin x)
converges, then it converges to a root of the equation in part (i).

2007-09-06 09:19:27 · 3 answers · asked by plolol 2 in Mathematics

I am petrified of spiders and I have never seen one this big in real life, I know it sounds cruel to keep it, but haven't the guts to free it outdoors or hoover it up and let it live in a dustbag. I have secured the beaker down with a good-sized satsuma in fear that it is so huge it might of squeezed itself out and seek revenge by continuously dashing out from under the settee while I am watching tv by myself in the evening. How much longer will I be victimised by it's presence?

2007-09-06 09:18:05 · 17 answers · asked by murphys2 2 in Zoology

Just Curious

2007-09-06 09:17:51 · 9 answers · asked by Josh L 1 in Zoology

2007-09-06 09:17:31 · 5 answers · asked by magiccaster4 1 in Chemistry

I need help finding an angle using Sine, Cosine, Tangent.

I have a right angle with the opposite side of 3. Adjacent side of 4 and they want me to find the point angle A. What is the formula I can use?

2007-09-06 09:13:59 · 5 answers · asked by Anonymous in Mathematics