Science & Mathematics - 4 December 2007

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2007-12-04 11:44:04 · 3 answers · asked by Anonymous in Geography

in my physics class we're building hovercrafts. They look like this: http://www.amasci.com/amateur/hovercft.html
my question is, is it advantageous to have a longer or shorter plastic "skirt"? and the whole in the center(like the doughnut hole), should it be bigger or smaller?

2007-12-04 11:43:10 · 2 answers · asked by one_eyed_wilma 1 in Engineering

express each equation in slope intercept form then determine eithout solving wether it has one solution none or infinate.
-x+2y=4
-4xminus2y=-14

Does the system of equation have no solution one or many? explain how YOU can tell without graphing.please.

y=xminus2

6y=3x+7

2007-12-04 11:43:06 · 2 answers · asked by Anonymous in Mathematics

I don`t even know if I wrote the qestion down right lol

2007-12-04 11:40:36 · 4 answers · asked by Jenny E 1 in Physics

Science question......

2007-12-04 11:38:45 · 2 answers · asked by Anonymous in Chemistry

Old Maps Of The Quadalupe Mountains and a documented story.

2007-12-04 11:38:28 · 4 answers · asked by Smack A 2 in Earth Sciences & Geology

2007-12-04 11:32:56 · 3 answers · asked by JJ 1 in Earth Sciences & Geology

like the planets in a straight like facing each other : example: sun-> O ......... <- dots are planets

2007-12-04 11:30:04 · 10 answers · asked by daisy i 1 in Astronomy & Space

what can happen if you take metformin doses too close together?

2007-12-04 11:27:21 · 3 answers · asked by jrtataw 2 in Medicine

Solve algebraically or graphically!

x^2 + y^2 = 25
3y - 4x = 0

I need help because my notes are chicken scratch and I can't tell by my notes how the hell to do this!

2007-12-04 11:26:43 · 11 answers · asked by Jimmy D 2 in Mathematics

2007-12-04 11:26:15 · 7 answers · asked by Anonymous in Astronomy & Space

2007-12-04 11:25:07 · 5 answers · asked by guynadivi 2 in Astronomy & Space

my calculator broke so dont call me stupid just lazy

2007-12-04 11:23:43 · 6 answers · asked by Anonymous in Mathematics

2007-12-04 11:22:54 · 9 answers · asked by roger 2 in Mathematics

Find 2 positive numbers that satisfy the given requirements
[Two separate problems ]

1.) The sum S and the product is a maximum

2.) The sum of the first and twice the second is 100 and the product is the maximum

Thanks.

2007-12-04 11:21:21 · 2 answers · asked by mastriannichris 1 in Mathematics

Another problem I'm having troubles with. Thanks guys!

2007-12-04 11:20:10 · 2 answers · asked by Hotwng 1 in Mathematics

I'm trying to make sure that I'm doing this correctly.

Does anyone know how to do these? (Calculus concept)

2007-12-04 11:13:24 · 1 answers · asked by Troy H 2 in Mathematics

Has it ever occurred to science, Geology. We use oil to cool things, Engines, Friction while Drilling, Oil is a useful dissipater of heat and a lubricant to friction and rubbing. Could it not be possible Oil, or Fossil Fuels Cool the Earths Core, The molten mass that erupts through cracks and shifts of the Earth, Could It Not Be Possible? It was brilliantly figured out we need to put something back down the huge under ground chambers. Disposal costs are very high. it wouldn't be to far fetched to think some 55 gallon drums of substance could have been used as a Earths Filler. Really some Nasty Chemicals’ were not uncommon here in Texas in the 70's and 80's. Any way huge chunks of earth is falling in on it's self 800 yards by 500 yards huge cavities filled with rancid water. The growing and shrinking of mountains on earth’s tectonic plates, and fault lines would in my mind explain today’s environmental changes globally and thus we assume. It just seems to my thinking without oil in the Earth the Hotter the earth is Going to Get!
BPE, 2min.wks
K-Town Texas

2007-12-04 11:12:04 · 3 answers · asked by Smack A 2 in Earth Sciences & Geology

I was trying to solve a question and couldn't find the answer. Can someone please tell me where I am going wrong?

Question:
Water is leaking out of an inverted conical tank at a rate of 10000cm^3/min at the same time water is being pumped into the tank at a constant rate. The tank has height of 6m and the diameter at the top is 4m. If the water level is rising at a rate of 20cm/min when the height of the water is 2m, find the rate at which water is being pumped into the tank.

My answer:
h/6=r/2
r=h/3

v=(1/3)pi*r^2*h
v=(1/3)pi(h^3/9)

dv/dt = (pi*h^2)/9 * dh/dt
dv/dt = [pi* 40000 * 20] / 9
dv/dt=279252 cm^3/min

Can someone tell me where I am going wrong? Also, please do it using the same method and not the tan-vertex one.

IU

2007-12-04 11:11:32 · 2 answers · asked by IU 1 in Mathematics

why are masses different from a triple beam balance and the electronic balance?

thanks!

2007-12-04 11:10:08 · 1 answers · asked by Anonymous in Chemistry

If jet aircraft have convergent exhaust nozzles to produce power. Why does the space shuttle have a divergent exhaust nozzle?

2007-12-04 11:09:20 · 3 answers · asked by Anonymous in Engineering

2007-12-04 11:06:46 · 4 answers · asked by missymommyof3 1 in Biology

The height of a certain waterfall is 33.3 m. When the water reaches the bottom of the falls, its speed is 25.8 m/s. Neglecting air resistance, what is the speed of the water at the top of the falls?

2007-12-04 11:06:22 · 1 answers · asked by Anonymous in Physics

Can somone show me the steps to how to do this problem please? Thank You.

2007-12-04 11:06:09 · 2 answers · asked by Thanh 1 in Mathematics

This is a crazy word problem, I don't even know where to start.

A large institution is preparing lunch menuse containing foods A and B. Food A contains 1 unit of fat per oz, 2 of carbs per oz, and 1 of protein per oz. Food B contains 1 unit of fat per oz, 1 unit of carbs per oz and 1 unit of protein per oz. Each lunch must provide at least 6 units of fat per serving, no more than 7 units of protein, and at least 10 units of carbs. The institution can purchase food A for $0.12 per oz and food B for $0.08 per oz. How many oz of each food should a serving contain to meet the dietary requirements at the least cost?
Any help would be greatly appreciated, thanks in advance and a quick thanks to all the top contributers out there.

2007-12-04 11:05:43 · 3 answers · asked by Happy Killa Pants 2 in Mathematics

2007-12-04 11:04:54 · 14 answers · asked by Anonymous in Astronomy & Space

We are putting impact indicators on our hasselblads at our rental facility, and the ones listed at mcmaster-carr are categorized by g-force sensitivity. on the items that are for single use, the items from 0-10 lbs have a default of 100 G, and i am wanting the resettable ones. does anyone know what i should get for a hasselblad camera. they are under 10lbs. i dont want it to be too sensitive so that we have to investigate when someone just bumps up aginst something.. but i need to know when an item is dropped. any suggestions?

you can see for yourself on:

http://www.mcmaster.com/
page 1489

2007-12-04 11:01:49 · 5 answers · asked by jespi_78 1 in Engineering

Assuming that gasoline is C8H18 and has a density of 0.703 g/ml

2007-12-04 11:00:40 · 2 answers · asked by tibsy2007 2 in Chemistry

I need to quickly know how long it takes for a cave to form, more then one cave would be helpful example-limestone, and gypsum caves. Thanks you whoever gets the answer right, the 10 points will go to you.

2007-12-04 10:59:12 · 2 answers · asked by Anonymous in Earth Sciences & Geology

i have heard of idaho potatoes planted in idaho. and there is russet potatoes. of course i don't know where they are planted at. but is there such a thing about the red skinned potatoes? and being called red pontiac potatoes?

2007-12-04 10:58:44 · 3 answers · asked by jemilroy@sbcglobal.net 1 in Botany