Science & Mathematics - 6 December 2007

2007-12-06 15:36:58 · 11 answers · asked by need help 1 in Astronomy & Space

Buffalo, NY - 12 degrees, just a dusting of snow

2007-12-06 15:34:17 · 5 answers · asked by magnet4trouble 4 in Weather

2007-12-06 15:32:48 · 6 answers · asked by Anonymous in Physics

For each predator-prey system, determine which of the variables, x or y, represents the prey population and which represents the predator population. Is the growth of the prey restricted just by the predators or by other factors as well? Do the predators feed only on the prey or they have additional food sources? Explain.

a) dx/dt = -0.05x + 0.0001xy
dy/dt = 0.1y - 0.005xy

b) dx/dt = 0.2x - 0.0002x^2 - 0.006xy
dy/dt = -0.015y + 0.00008xy

show work/steps plz..thanks!

2007-12-06 15:31:18 · 2 answers · asked by Anonymous in Mathematics

2007-12-06 15:27:52 · 2 answers · asked by peaches 1 in Mathematics

2007-12-06 15:26:52 · 2 answers · asked by Anonymous in Botany

I have a few questions on cellular respiration. Is it a chemical chande or physical change? does it take place in every organism such as fungi and bacteria too. Does cellular respiration gove pf materials needed for digetion? Can you explaim to me what it really is in a non-complicated form. I don't really get it becasue all the other webs have it all complicated. I dont need the formula either! THANKS A BUNCH!

2007-12-06 15:24:03 · 4 answers · asked by :D 2 in Biology

2007-12-06 15:23:28 · 6 answers · asked by Anonymous in Botany

2007-12-06 15:18:52 · 11 answers · asked by Donna D 1 in Mathematics

After being pushed and released, a 50kg crate slides across a factory floor. Friction on the sliding crate is 200N. what is the crate's acceleration?


what are the equations and steps to find the answer?

2007-12-06 15:18:46 · 3 answers · asked by Catherine 2 in Physics

It says- Tell whether the following are true or false and explain your answeres:

A. Real Numbers are a subset of Integers.
B. Whole Numbers are a subset of Natural Numbers.
C. Integers are a subset of Real Numbers.

I think B is false, I think Natural Numbers are a subset of Whole Numbers. Am I correct? Help me on ABC, plz. Thank you!:)

2007-12-06 15:18:37 · 5 answers · asked by HollyW 1 in Mathematics

Also, are sister chromatids identical or do they contain different alleles?

2007-12-06 15:15:16 · 3 answers · asked by Kylie 2 in Biology

2007-12-06 15:14:48 · 7 answers · asked by Martha S 1 in Mathematics

Is 2 and 2/3 a Rational, Irrational, Natural, or Whole Number? Or is it an Integer? Need help plz!:)

2007-12-06 15:13:36 · 2 answers · asked by HollyW 1 in Mathematics

One model for the spread of a rumor is that the rate of spread is proportional to the product of the function y of the population who have heard the rumor and the fraction who have not heard the rumor.

a) write a differential eq. that is satisfied by y.
b) solve the differential eq.
c) A small town has 1000 inhabitants. At 8am, 80 people have heard a rumor. By noon half the town has heard it. At what time will 90% of the population have heard the rumor?

show work/steps plz..thanks!

2007-12-06 15:12:30 · 2 answers · asked by Anonymous in Mathematics

what are the possible reminders when 100th power of an integer is divided by 125.

2007-12-06 15:11:58 · 1 answers · asked by MOHAMMAD S 1 in Mathematics

Is it true that if we study Venus' greenhouse effect atomosphere, we can learn to control it here on Earth? Or that we can learn to stop air pollution in our atmosphere by studying other planet's atmosphere?

Basically ... can the information about other planets in our solar system help us understand ours?

2007-12-06 15:09:42 · 4 answers · asked by husna 1 in Astronomy & Space

solve for x. show steps
a) 3.4x to the exponent 2.5= 24.3 to the exponent 3.4

b) 3(x-2)squared = (3x-2)(x+5)

2007-12-06 15:07:26 · 1 answers · asked by Anonymous in Mathematics

2007-12-06 15:05:56 · 10 answers · asked by Melissa M 1 in Biology

Can anyone explain why that when a capacitor and inductor with opposite impedances are placed it paralell, their effective impedance is infinte, and thus modeled as an open circuit.
I HAVE DERRIVED IT MATHEMATICALLY. BUT I CANT GRASP IT CONCEPTUALLY. LOOKING FOR A DESCRIPTIVE EXPLANATION.

2007-12-06 15:05:09 · 2 answers · asked by kennyk 4 in Engineering

rewrite to solve for F3. Show steps

1/F1 = 1/F2 + 1/F3

2007-12-06 15:04:50 · 1 answers · asked by Anonymous in Mathematics

s = 1/2 g t^2 + v0t < --- > (distance an object falls)


t = ???

2007-12-06 15:03:49 · 4 answers · asked by Matt H 2 in Mathematics

the 1 and 2 under neath the fraction are like exponents but underneat the number indstead of on top i dont know wat dat means

2007-12-06 15:02:19 · 2 answers · asked by andrew n 1 in Mathematics

1.6x2 - 4x - 3 = 0

2.x2 - 3x - 40 = 0

3.(x + 4)2 = 16

2007-12-06 15:00:37 · 4 answers · asked by ry ry 3 in Mathematics

2007-12-06 14:57:59 · 1 answers · asked by Paige 2 in Mathematics

http://www.flickr.com/photos/20335967@N05/2091984821/

2007-12-06 14:55:43 · 1 answers · asked by Anonymous in Botany

If a person is in a car starts driving at the constant speed V. If a sled is at rest at the top of a slope, it has some potential energy. Once it rolls down the hill, it has kinetic energy, while moving at the same constant speed V. , how is that from the reference frame of the car, Kinetic Energy = 0, thus, ME initial is not = to ME final, violating newton's law.

2007-12-06 14:55:43 · 1 answers · asked by Fantasy Football Guru 27 3 in Physics

what could potentially happen if a 15 year old girl took four mortin at once? also, could you notice strange effects from it about a day after taking them?

2007-12-06 14:55:02 · 5 answers · asked by roo 1 in Medicine

The kinetic energy E(sub k) of a moving object, measured in joules, varies jointly as the mass "m" of the object and the square of speed "v". Find the constant of variation "k" if E(sub K) is 36 joules, "m" is 4.5 kilograms and "v" is 4 meters per second.

2007-12-06 14:54:08 · 2 answers · asked by Raquel - 3 in Mathematics

2007-12-06 14:45:24 · 9 answers · asked by B 1 in Earth Sciences & Geology