Science & Mathematics - 20 September 2007

A plane equipped with fixed horizontal engines and wheel landing gear is placed on a huge treadmill runway. The treadmill has a clever design and always matches the speed of the plane, but runs in the opposite direction. Will the plane take off and fly or not?

2007-09-20 11:44:25 · 4 answers · asked by spector_17 1 in Engineering

Can you figure out the last two numbers to this sequence?

4, 1, 6, 8, 50 ,402, ____ , _____

2007-09-20 11:43:34 · 3 answers · asked by Anonymous in Mathematics

2007-09-20 11:42:49 · 2 answers · asked by Christopher W 1 in Biology

6 blanks

2007-09-20 11:42:43 · 4 answers · asked by Cody 1 in Earth Sciences & Geology

cuz i have NOOO idea

THANK YOU VERY MUCH in advance ; )

2007-09-20 11:41:19 · 2 answers · asked by Kathleen 2 in Physics

"The cube of a number is always greater than the number"

i'm really, really cruddy with finding counterexamples for conjectures! please help!

2007-09-20 11:40:07 · 5 answers · asked by BLEH 1 in Mathematics

Not asking for someone to analyze it for me, I am just confused by the three voltage suppliers... how do I go about applying KVL? Here is the actual question:

First use KVL to find the voltage across each resistor, then use Ohm's law and KCL to find the current through every element, including the voltage sources.

OK that's fine, but how do I know which way the current flows and how having 3 voltage supplies in parallel effects this? I'm lost, any hints would be most welcome. Here is the circuit:

http://images7.pictiger.com/thumbs/8a/e005134f1833a4f4bbe72f892128ae8a.th.jpg

2007-09-20 11:38:33 · 3 answers · asked by Anonymous in Engineering

The volume of 125g of copper.

2007-09-20 11:38:33 · 3 answers · asked by mheg 1 in Chemistry

The magnitude of the force that the ball exerts on the bat is??

2007-09-20 11:38:02 · 3 answers · asked by Anonymous in Astronomy & Space

A.6 hours

B.12 hours

C.24 hours

D.48 hours

2007-09-20 11:36:25 · 4 answers · asked by Anonymous in Astronomy & Space

2007-09-20 11:34:33 · 2 answers · asked by Anonymous in Earth Sciences & Geology

2007-09-20 11:34:06 · 2 answers · asked by Robert M 2 in Mathematics

2007-09-20 11:33:16 · 26 answers · asked by Me. 3 in Earth Sciences & Geology

Here's the question:

A man runs as fast as he can along a moving sidewalk from one end to the other, taking 2.50 s. A security agent appears, and the man runs as fast as he can back along the sidewalk to his starting point, taking 10.00 s. What is the ratio of the man's running speed to the sidewalk's speed.

I'd like have more than just the answer, I need to know how to work the problem.

Thanks for any assistance I get! It's much appreciated.

2007-09-20 11:31:43 · 1 answers · asked by Anonymous in Physics

2007-09-20 11:27:52 · 1 answers · asked by Anonymous in Physics

when will i ever use algebra in life? im not going to be a math tacher or scientist so why teach it to me

2007-09-20 11:26:08 · 10 answers · asked by sokhead93 1 in Mathematics

1. plants are the example of _____ organisms that are able to use a source of energy, such as the sun to reproduce food from simple inorganic molecules.
2. what is the balanced equation for photosynthesis?
3. animals are examples of _____ organisms that are able to use a source of energy, such as the sun to reproduce food from simple inorganic molecules.
4. find the balanced chemical equation for cellular respiration.
5. do plants preform cellular respiration?
6. what are the eyespots called that help Planaria detect light?

please help me ppl! my bio teacher is sooooo mean, i missed a day, and he says that ill have to "get it done, figure it out, make it happen" argh plz help hes sooo anoying =((((((((((((

2007-09-20 11:25:29 · 1 answers · asked by Max 1 in Biology

What is the mass of 2.6 x 10^23 molecules of ammonia, NH3?

2007-09-20 11:22:39 · 3 answers · asked by bigoltx 2 in Chemistry

i need help :/

1.0 cm^3 of water has a mass of 1.0x10^.3 kg at 25degrees C. what's the mass of 1.0 m^3 of water at 25degrees C?

thanks so much ~

2007-09-20 11:22:32 · 1 answers · asked by Anonymous in Physics

2007-09-20 11:22:07 · 11 answers · asked by lildave13 1 in Astronomy & Space

I saw this in a cave last weekend . Its beautiful I would like to put a picture of it in my cave file.
Chemo"ato"lithotropic bacteria
I have googled it can't find it

2007-09-20 11:20:58 · 2 answers · asked by Carroll 4 in Earth Sciences & Geology

We are planning a trip this weekend to Disney World and Saturday is Scattered Showers and Sunday is Isolated Thunderstorms. Which is worse?

We live in FL. so there is no scheduling the trip when there is no rain because rain is always in the forecast!!

2007-09-20 11:20:25 · 5 answers · asked by Anonymous in Weather

Which of the following is true for a system whose equilibrium constant is relatively small?


A. It will take a short time to reach equilibrium.
B. It will take a long time to reach equilibrium.
C. The equilibrium lies to the left.
D. The equilibrium lies to the right.
E. Two of these.

I think the answer should be B, but I am not sure about the equilibrium position, so I don't know if the answer could be E. Please help.

2007-09-20 11:19:58 · 1 answers · asked by Anonymous in Chemistry

2007-09-20 11:18:03 · 4 answers · asked by baby doll 2 in Botany

f(x)=cubed-root of x
f(a)=limit x goin' to a... f(x)-f(a)/x-a
please help.. i got 1 over 3 times (the squared-root of a)^2
oooh no!! i have no idea! someone save me!!

2007-09-20 11:15:57 · 2 answers · asked by Anonymous in Mathematics

2007-09-20 11:15:38 · 2 answers · asked by iluvsoccer 1 in Biology

Alright in bio we did a lab where an old candle was placed in a finger bowl. The finger bowl was filled with 150 ml of water so the water went up to 1/2 of the candle. You light the candle and cover the candle with a beaker. In about 10 seconds, the candle goes out. Why did that happen?

2007-09-20 11:15:17 · 4 answers · asked by Justin S 2 in Biology

Which planets are similar to Earth in terms of geometric shapes?

2007-09-20 11:15:09 · 5 answers · asked by Anonymous in Astronomy & Space

think of a situation you observed outside school in which deductive reasoning was used incorrectly.write some sentences describing what happened and explaining why you think is a poor deductive reasoning?

2007-09-20 11:14:19 · 3 answers · asked by hi ! (: 3 in Mathematics

cloudy? dark? idk, u tell me.

2007-09-20 11:13:53 · 7 answers · asked by missmaya417 2 in Weather