Science & Mathematics - 3 November 2007

2007-11-03 07:50:01 · 6 answers · asked by legoman90 1 in Earth Sciences & Geology

Im trying to figure out if microorganisms effect the rate the plant grows. Im using Lima Beans (is that good?) im going to plant them in 2 pots, bake one (to kill the microogranisms) then record what i see...
my question is...i want to make it seem more superior than what it seems. ive never put my all in science projects, and sorry, i dont have enough time to put much...
i know about nitrogen fixation. is there a website? or can any of you please help me? :[
its my senior year, and im in ap bio. i need it.

2007-11-03 07:49:41 · 3 answers · asked by bee loving. 3 in Botany

Ok these 2 i had the most difficult with.

1- Suppose you have to hold a box of mass 10 kg against a wall so that the box does not slip. The coefficient of friction between the wall and the box is 0.70. What must be the minimal force you have to apply?

2- 3 masses m1 = 10 kg, m2 = 15 kg and m3 = 20 kg, are pulled with a force of 166N across a table. A coefficient of friction between the table and boxes is 0.12.
(theres suppose to be a pic but i couldnt get it on here)

a- Calculate the acceleration of the masses
b- Calculate the tension of T2
c- Calculate the tension T3

2007-11-03 07:48:08 · 1 answers · asked by Michael 1 in Physics

should i go to the doctor or just let it flow!

2007-11-03 07:48:06 · 12 answers · asked by cheezal27 1 in Medicine

6n^2-23n+7

thanks

2007-11-03 07:48:06 · 5 answers · asked by Anonymous in Mathematics

numerous studies shown that IQ scores have been increasing, generation by generation, for years. The increase is called Flynn Effect, and the data indicate that the increase appears to be about 7 points per decade. To demonstrate this phenomenon, a researcher obtained an IQ test that was written in 1980. At the time, the test was prepared, it was standardized to produce a population mean of 100. The researcher administers the test to a random sample of N=16 of today's highschool students and obtains a sample mean IQ of M=121, with a squared standard deviation of 6000.

Is this result sufficient to conclude that today's sample scored significantly higher than would be expected from a population with a mean 100? use a one-tailed test, with alpha level of .01

2007-11-03 07:46:10 · 1 answers · asked by Anonymous in Mathematics

Solve by factoring:

2x^2 - 6x = 0

Thanks

2007-11-03 07:45:35 · 8 answers · asked by lexismom2005 1 in Mathematics

help

2007-11-03 07:45:23 · 3 answers · asked by mlmwk 1 in Earth Sciences & Geology

2007-11-03 07:45:17 · 4 answers · asked by S i r i 1 in Medicine

We found 4 of them together. Here is a picture:

http://i19.tinypic.com/6h44t8w.jpg

I THINK that is a tail, not a mouth (because it doesn't appear to have a jaw). It is small, about as long as my hand.

Found all four washed up in the Atlantic in Eastern Canada (so starting to get chilly as it is fall)... if that helps at all?

2007-11-03 07:37:15 · 5 answers · asked by Anonymous in Zoology

2007-11-03 07:36:33 · 4 answers · asked by Anonymous in Physics

does any one know the height above sea level of the mountain K2 in the Himalayas please in feet and inches if possible

2007-11-03 07:32:41 · 3 answers · asked by Anonymous in Earth Sciences & Geology

2007-11-03 07:31:07 · 8 answers · asked by chuck t 1 in Astronomy & Space

2007-11-03 07:26:36 · 5 answers · asked by Breed 2 in Astronomy & Space

2007-11-03 07:26:19 · 6 answers · asked by lord_andys_new_id 1 in Engineering

Suppose that G is a group with more than one element and G has no proper, nontrivial subgroups. Prove that |G| is prime. (Do not assumeat the outset that G is finite.) Show all your setp

Thank you

2007-11-03 07:20:36 · 3 answers · asked by Lole E 1 in Mathematics

My school is having its annual blood drive and I am finally able to donate. I have never had blood taken before so i don't know anything about it. I have heard that you shouldn't eat before they do it and all these things. What should I know to be more prepared for it?

2007-11-03 07:16:04 · 3 answers · asked by *My_Oh_My* 2 in Medicine

Okay... so I get the jist of factoring...blablabla BASIC

But yea, need help with two problems

How to factor:

(x-1)3 - (x-1)2 (that is (x-1) to the third - (x-1) to the second)

and

(z-4)3-4(z-4) (that is z-4 to the third minus 4 times the quantity x-4

HELP!!!

2007-11-03 07:11:12 · 4 answers · asked by softballanimechick124 2 in Mathematics

i have to do a simple project on electric circuit.can you explain the working of the above things.if that's tough can u suggest any load for a electric circuit.

2007-11-03 07:10:31 · 1 answers · asked by shahzadiarif 1 in Physics

2007-11-03 07:09:11 · 13 answers · asked by Britney B 1 in Weather

Use differentials to estimate the maximum error in the calculated surface area. Estimate the relative error in the calculated surface area..
The circumference of a sphere of radius r is c=2(pi)r, and its surface area is A=4(pi)(r^2). Eliminate r first! I did eliminat r from crcumference and then found derivative , but the answer is not what i am geting. PLease help

2007-11-03 07:03:59 · 3 answers · asked by Amer 1 in Mathematics

i need the circuit for dc motor controller too.
tanx

2007-11-03 07:02:13 · 1 answers · asked by Friend 2 in Other - Science

answer is 4^15- 4C1.3^15+4C2.2^15-4C3.1^15
please explain the logic

2007-11-03 07:00:50 · 5 answers · asked by mathiphy 2 in Mathematics

In Fig. 13-41, a particle of mass m1 = 0.56 kg is a distance d = 30 cm from one end of a uniform rod with length L = 5.5 m and mass M = 2.4 kg. What is the magnitude of the gravitational force on the particle from the rod?

http://i95.photobucket.com/albums/l156/pontellierlover/fig13_41.gif

2007-11-03 06:51:04 · 1 answers · asked by Anonymous in Physics

Certain neutron stars (extremely dense stars) are believed to be rotating at about 0.77 rev/s. If such a star has a radius of 10 km, what must be its minimum mass so that material on its surface remains in place during the rapid rotation?

2007-11-03 06:45:03 · 1 answers · asked by Anonymous in Physics

Here's a link to one review of the TV show on Lifetime called America's Psychic Challenge.
http://www.commonsensemedia.org/tv-reviews/Americas-Psychic-Challenge.html

The show puts proported psychics in test situations and records the results. If you've seen this show, I'm interested in hearing your opinions about the techniques that are used to test the participants. Do you feel they are stringent enough? Are they too tough? Does repeated success in the tests give an indication or proof of psychic ability?

Finally, for those who are more aligned with parapsychological research, which skills do you feel are being tested? Does the presence of the testing moderators give an advantage to specific psychic abilities in the tests?

This question is posed to both skeptics and believers who have seen the show, so please be respectful in your answers. Thanks!

2007-11-03 06:42:57 · 13 answers · asked by Tunsa 6 in Parapsychology

astronomy, science, zodiac,

2007-11-03 06:36:26 · 12 answers · asked by well? 1 in Astronomy & Space

the point of snow??

Apart from making people cold and wet what purpose does it serve? could we use section 5 of the public order act to take its stereo and order it to one of the poles where it wont make a nuisance of itself?

2007-11-03 06:35:28 · 10 answers · asked by Anonymous in Earth Sciences & Geology

a magnifying glas uses a converging lens with a focal length of 14.5 cm. it produces a virtual and upright image that is 3.1 times larger than the object, how far is the object from the lens?


what is the image distance?


dont i use the eqn 1/p+1/q=1/f?

i got the answer wrong what am i doing wrong?

explain in details..........

2007-11-03 06:33:08 · 1 answers · asked by Pac M 1 in Physics

A small model airplane motor has 4 starting components: key, battery, wire, and glow plug. What is the probability that the system will work if the probability that each component will work as follows: key (0.998), battery (0.997), wire (0.999), and plug (0.995)?

2007-11-03 06:30:19 · 8 answers · asked by Jerry M 1 in Mathematics