Science & Mathematics - 12 July 2007

Are there any insects or fish that one should beware of when swimming in a lake?

2007-07-12 20:28:48 · 12 answers · asked by Anonymous in Other - Science

Is only given the molecular weight. How to determine the mass of the solution?

2007-07-12 20:28:27 · 2 answers · asked by Andre k 1 in Chemistry

I know the formulas for the coefficient of restitution are:

Cr = V(final)/Velocity(initial) and:

Cr = sqrt(bounce height/drop height)

but what is the working for getting to the Cr = sqrt(bounce height/drop height) from using Cr = V(final)/Velocity(initial). I know you have to use PE = mgh and all that.

Thanks

2007-07-12 20:20:51 · 1 answers · asked by Anonymous in Physics

Factor the polynomial completely. If the polynomial cannot be factored, write prime.
15x2 + 16x + 4

(3x - 2)(5x - 2)
(3x + 2)(5x + 2)
(15x + 2)(x + 2)
prime

2007-07-12 20:18:09 · 4 answers · asked by Anonymous in Mathematics

Factor the polynomial completely. If the polynomial cannot be factored, write prime.
9z2 - 6z - 8

(3z + 2)(3z - 4)
(9z + 2)(z - 4)
(3z - 2)(3z + 4)
prime

2007-07-12 20:16:22 · 3 answers · asked by Anonymous in Mathematics

2007-07-12 20:15:33 · 3 answers · asked by been there 2 in Medicine

Find a positive value of the given variable so that the trinomial is factorable.
5x2 + 8x + c; c = ?

8
9
3
4

2007-07-12 20:14:58 · 4 answers · asked by Anonymous in Mathematics

2007-07-12 20:06:33 · 9 answers · asked by genny2727 1 in Biology

Two cyclists start biking from a trail’s start 3 hours apart. The second cyclist travels at 10 miles per hour and starts 3 hours after the first cyclist who is traveling at 6 miles per hour. How much time will pass before the second cyclist catches up with the first from the time the second cyclist started biking?

i need to know the formula used to find the answer to this problem. if you know the formula i'd really appreciate your help. thanks.

2007-07-12 20:04:34 · 3 answers · asked by klept_oh 2 in Mathematics

2007-07-12 19:53:48 · 7 answers · asked by Anonymous in Biology

anyone can help me out... here are the sites to the pics..
thanks in advance!

http://i49.photobucket.com/albums/f294/dorotalp91/Pictures9022.jpg
http://i49.photobucket.com/albums/f294/dorotalp91/Pictures9028.jpg
http://i49.photobucket.com/albums/f294/dorotalp91/Pictures9023.jpg

2007-07-12 19:52:13 · 4 answers · asked by dorotalp91 2 in Zoology

Would it be possible, in theory to split a subatomic particle? If so, how much power would it produce? Say if you split an electron, or even smaller than that a quark, neutrino, positron, or other sub-sub-atomic particles, what would one do to even fathom splitting one? If it takes a neutron forced into a large atom to split the atom, would it be possible to fire say, neutrinos or positrons at a proton to split it?

2007-07-12 19:40:36 · 4 answers · asked by ghilliemarine 2 in Physics

2007-07-12 19:37:00 · 5 answers · asked by greenvillein 1 in Physics

Name the atom

2007-07-12 19:35:45 · 4 answers · asked by Glady Wednesday 1 in Chemistry

its the same question over and over and over and over and over and over oh wait we have a different one, and over and over and over

http://www.pbs.org/wgbh/nova/elegant/media2/3014_q_06.html
http://www.tenthdimension.com/medialinks.php

2007-07-12 19:33:32 · 6 answers · asked by Mercury 2010 7 in Astronomy & Space

2007-07-12 19:27:03 · 7 answers · asked by kelleygaither2000 1 in Agriculture

And if it stops.....What the hell is after it?????????????? Think about it for awhile...

2007-07-12 19:19:49 · 19 answers · asked by Anonymous in Astronomy & Space

Thought about this for years......nothing just nothing....no space nothing!!!!?????

2007-07-12 19:18:24 · 13 answers · asked by Anonymous in Astronomy & Space

2007-07-12 19:11:44 · 7 answers · asked by green eyes 1 in Chemistry

this is a research on our chemistry subject

2007-07-12 19:05:42 · 7 answers · asked by Eugene 1 in Chemistry

2007-07-12 19:01:58 · 3 answers · asked by green eyes 1 in Chemistry

Can we use 100% of our brain? presently we can use only 5 to 7 % of our brain.

2007-07-12 19:01:56 · 18 answers · asked by rajesh k 1 in Medicine

Hey I just have a conceptual question for ya. Can the instantaneous power absorbed by an energy storage element (Cap or Inductor) by a negative value? I'm just trying to get some answers to possible questions on a test I have coming up. My guess on this question would be yes it can, when it's discharging on the current is leaving the + terminal this disobeying PSC. Am I wrong?

Here's another one:

Is there any significant affect the RMS value has in relation to power absorbed by a resistor?

And lastly,

In a first order transient does voltage in an inductor always increase exponentially.

Just throw some answers at me with your thoughts, thanks!

2007-07-12 19:00:39 · 1 answers · asked by Gearz 2 in Engineering

1) ammonium chloride (NH₄Cl) and sulfuric acid (H₂SO₄)
2) ammonium chloride (NH₄Cl) and lead(II) nitrate, Pb(NO₃)₂

2007-07-12 19:00:07 · 3 answers · asked by 3nathn 3 in Chemistry

use something like this :

(stats) / / // (end)


thanks

2007-07-12 18:59:20 · 4 answers · asked by Anonymous in Mathematics

I've always wondered if you do all the math in your head or your sitting there with your handy dandy paper and pencil, kindly helping everyone out...?
Man, you people are so smart! Seriously!

2007-07-12 18:55:01 · 9 answers · asked by jaz 5 in Mathematics

2007-07-12 18:53:07 · 6 answers · asked by Anonymous in Engineering

An inclined plane 10m long has one end raised 10m.If a force of 500N is needed to push a box of weight of 800N ,Find the following...
a. efficiency
b. work input
c. work output
d. Mechanical advantage

2007-07-12 18:50:42 · 3 answers · asked by Boxster 2 in Physics

I'm having trouble understanding how 2x^3 -3x^2 - 3x+2 = 0
becomes (x-2) (x + 1) (2x-1) = 0 when factored. Plz help.

2007-07-12 18:48:44 · 7 answers · asked by Anonymous in Mathematics

2007-07-12 18:47:58 · 3 answers · asked by iNa~ 1 in Engineering