Science & Mathematics - 10 February 2007

2007-02-10 14:28:40 · 1 answers · asked by Kay 1 in Chemistry

how does enzyme lower activation energy? How does it affects rate of reation? using hexokinase and

2007-02-10 14:27:07 · 2 answers · asked by Anonymous in Biology

Theoretically, if a person could travel to the exact center of the Earth, would there be a point where they would be weightless? To clarify, imaging traveling from where you are now down through the Earth. Once you pass the center and continue traveling straight, you would now be on the "other side" of the Earth and gravity would be pulling you backwards. Since this is the case, it seems that there must be some "neutral" point.
Thanks for any answers...

2007-02-10 14:25:32 · 5 answers · asked by Jeffrey M 1 in Earth Sciences & Geology

Wouldn't it be great if the temperature on every location on earth was like 20-23 degrees Celsius?

2007-02-10 14:24:59 · 8 answers · asked by quicksilver5795 2 in Weather

2007-02-10 14:19:05 · 13 answers · asked by Mr Spock 1 in Astronomy & Space

2007-02-10 14:13:58 · 16 answers · asked by Linda S 1 in Mathematics

2007-02-10 14:12:52 · 4 answers · asked by dayumnzitsme 1 in Zoology

2007-02-10 14:10:46 · 6 answers · asked by Anonymous in Astronomy & Space

I can deliver tones of carbon very quikly and harmlessly to the ocean surface.Can you help me collect and contain it.The reward could be beyond our wildest dreams in our lifetime.

2007-02-10 14:10:44 · 2 answers · asked by stratoframe 5 in Physics

2007-02-10 14:10:21 · 1 answers · asked by selece_wingard 1 in Biology

please help

2007-02-10 14:10:12 · 2 answers · asked by Alex33 2 in Botany

What is the probability that the larger of two random observations drawn from any continuous pdf (?) will exceed the 60th percentile?

Theorem: Let Y be a continuous random variable with probability density function f_Y(y). If a random sample of size n is drawn from f_Y(y), the marginal pdf for the ith order statistic is given by:

f_Y'_i(y) = n!/[(i-1)!(n-i)!] * [F_y(y)]^(i-1) * [1-F_Y(y)]^(n-i) * f_Y(y)

for 1<=i <= n.

The answer to the question is 0.64. I don't understand how to reach it? How do I know what f_Y(y) equals? Does the solution involve some delicious integration?

2007-02-10 14:09:22 · 2 answers · asked by metalgoomba 1 in Mathematics

2007-02-10 14:09:05 · 7 answers · asked by Anonymous in Astronomy & Space

2007-02-10 14:08:57 · 7 answers · asked by Kristy M 1 in Medicine

2007-02-10 14:04:47 · 7 answers · asked by Anonymous in Astronomy & Space

the davey tree company has 80 yards of fencing with which to enclose a rectangular garden. If the garden is x yards long, express the garden's area as function of the length

2007-02-10 13:59:50 · 4 answers · asked by Allen 3 in Mathematics

If money and politics were no object...
How wide would it have to be?
How long would it take to build?
How much would it cost?
What would be the dangers or advantages of such a massive superstructure?

2007-02-10 13:57:03 · 14 answers · asked by M J 3 in Engineering

If money and politics were no object...
How wide would it have to be?
How long would it take to build?
How much would it cost?
What would be the dangers or advantages of such a massive superstructure?

2007-02-10 13:56:35 · 9 answers · asked by M J 3 in Astronomy & Space

2007-02-10 13:52:43 · 10 answers · asked by Anonymous in Astronomy & Space

does it require energy for an atom o emit a particle? can u explain please? T^T

2007-02-10 13:52:33 · 3 answers · asked by Anonymous in Physics

hailbob comet

2007-02-10 13:47:53 · 3 answers · asked by Brandon R 1 in Astronomy & Space

a) An artificial atmosphere for the planet Mars consists of 80 % carbon dioxide gas (CO2),
15 % methane gas (CH4), and 5 % nitrogen gas (N2). 10.0 g of this gas mixture is placed
in a 100 L container at temperature of 4 °C.
i. What is the partial pressure of each gas inside the container ?

ii. What is the mole fraction of each compound in the artificial atmosphere?

2007-02-10 13:47:47 · 2 answers · asked by sin clair 1 in Chemistry

Thanks for your help! Please site your sources :D

2007-02-10 13:45:07 · 7 answers · asked by Okay.... 3 in Earth Sciences & Geology

plz help!

2007-02-10 13:44:18 · 8 answers · asked by Semona_Pwns_You 1 in Mathematics

what is a funny valentine saying that has to deal with biology?

help me please!

2007-02-10 13:41:38 · 6 answers · asked by outkast19920 1 in Biology

Please site sources and thank you so much! :)

2007-02-10 13:33:27 · 4 answers · asked by Okay.... 3 in Earth Sciences & Geology

A cubic meter of ocean water has 6 x 10^-6 g gold. If the total mass of the water in Earth's oceans is 4 x 10^20kg, how many kilograms of gold are distributed throughout the oceans? Assume that the density of seawater is 1g/cm3. How many liters of seawater would have to be processed to recover 1 kg of gold.

There's two questions to this problem. I would like to know how you would sove this problem and what's the answer?

2007-02-10 13:30:51 · 1 answers · asked by sw33t_lil_azn08 2 in Chemistry

2007-02-10 13:26:07 · 17 answers · asked by sun 2 in Biology

This is the question:
A certain first order reaction has a rate constant of .0275 at 20 degrees C. What is the value of k at 60 degrees C if the activation energy is 75.5 kj/mol.

So, K1 is .0275, k2 is unknown, T1 is 293 in kelvin, T2 is 333 k, and the activation energy is 75.5. I used this formula to solve the problem -
ln(k1/k2) = Ea/R (1/T2 - 1/t1)
So, (.0275/k2) = e to the ((75.5/8.31)((1/333)-(1/293)). then i got .0275/.9962, which is the wrong answer. The right answer is 1.1. Could someone please explain what I am doing wrong?

2007-02-10 13:25:10 · 1 answers · asked by Sam 3 in Chemistry

2007-02-10 13:24:55 · 4 answers · asked by questionwala 2 in Chemistry