Science & Mathematics - 28 October 2007

biologr class

2007-10-28 16:13:13 · 4 answers · asked by Anonymous in Chemistry

please could you make it simple, and that is do able in 1 hr or less that doesn't need like complex materials.
Thanks!

2007-10-28 16:12:15 · 2 answers · asked by ninja turtle 1 in Physics

thanks! :(

2007-10-28 16:09:51 · 7 answers · asked by candy 3 in Mathematics

Suppose the demand equation for a product is p=1600-8q where p is the price per unit in dollars when q units are demanded.

a.) At what level of production will the manufacturer's total revenue be maximum? (Please note: Revenue= price x quantity)

b.) Determine the maximum value

2007-10-28 16:07:28 · 3 answers · asked by Anonymous in Mathematics

where can i get a report of the barometric pressures in los angeles from last week?

2007-10-28 16:05:39 · 2 answers · asked by Anonymous in Weather

I know all imaginary zeros come in pairs (complex conjugate). But for this question the answer is there are 3 complex and 1 real : (state how many complex and real zeros for the function) x^3 - x + 3
Please explain.

2007-10-28 16:04:34 · 4 answers · asked by dumbleeedore 1 in Mathematics

2007-10-28 16:02:31 · 9 answers · asked by nancy c 1 in Physics

I'm curious to know what this pheromone is called and more about this process.

2007-10-28 15:57:14 · 11 answers · asked by Anonymous in Biology

Id like an explanation please. We've had airplanes for 100 years now... Where the hell is my sci-fi stuff? Dont gimme any fluff promises of nano-bots dusting my house. Where's my freaking laser gun?

2007-10-28 15:57:12 · 12 answers · asked by Anonymous in Engineering

a) y= 3x-2
y= -0.5x + 4

2007-10-28 15:54:18 · 1 answers · asked by Anonymous in Mathematics

The balls are a tennis ball, a golf ball, and a rubber bouncy ball.
Based on the concept of elastic potential energy

2007-10-28 15:52:55 · 4 answers · asked by ... 4 in Physics

1.which of this is a difference between DNA and RNA?

a)DNA is found in the nucleus; RNA is never found is the nucleus.

b)In DNA, adenine pairs with guanier; in RNA, adenine pairs with thymine.

c)DNA consists of five different nucleotides;Rna consists of four different nucleotides.

d)DNA contains thymine; RNA consists of four different nucleotides.

e)RNA is doubles-stranded; DNA is sigle-stranded.

2.which of the follwing is not a component of the endomembrane system?

a)Golgi apparatus
b)lysosome
c)vacuole
d)endoplasmic reticulum
e)ribosome

3.Nucleic acids are polymers of ____monemers.
a)nucleotide
b)hydrocarbon
c)fatty acid
d)DNA
e)monosaccharide

4.The difference between eukaryotic and prokaryotic cells is that eukaryotic cells ____prokaryotic.

a)have DNA, which is lacking in
b)have a nucleoid region, which is lacking in
c)lack the complexity seen in
d)have a nucleus, which is lacking in
e)have a plasma membrane, which is lacking in

2007-10-28 15:52:36 · 4 answers · asked by kk^Q^ 7 in Biology

2007-10-28 15:51:57 · 7 answers · asked by Anonymous in Other - Science

non uniform acceleration
the jerk motion is defined as the rate of change in velocity with time
a)write the equation which defines the average jerk with time
b)write the units for the average jerk
c)and tell me how to sketch a graph of jerk vs time ( for the carts motion )

2007-10-28 15:46:47 · 2 answers · asked by ashanti j 1 in Physics

(the element Silver) the symbol (Ag)

2007-10-28 15:46:06 · 2 answers · asked by Marina H 1 in Other - Science

Is it true that house dogs, house cats, and cows are all "man-made" animals. That is to say that these three animals would not exist in nature if man hadn't breeded them down to their mcurrent state? You are not going out in the wilderness and see a cow or a poodle, correct?

2007-10-28 15:44:53 · 6 answers · asked by Anonymous in Zoology

my choices are:
1) they produce ATP.
2)they produce glucose.
3)they store it in molecules of co2.
4)the energy is coupled to oxygen.
5)none of the choices are correct.

2007-10-28 15:43:17 · 1 answers · asked by Anonymous in Biology

1. a 63-kg skier coasts up a snow-covered hill that makes an angle of 25 degrees with the horizontal. the initial speed of the skier is 6.6 m/s. after coasting a distance of 1.9 m up the slope, the speed of the skier is 4.4 m/s. [A] find the work done by the kinetic frictional force that acts on the skis. [B] what is the magnitude of the kinetic frictional force?


2. a water slide is constructed so that swimmers, starting from rest at the top of the slide, leave the end of the slide traveling horizontally. as the drawing shows, one person hits the water 5.00 m from the end of the slide in a time of 0.500 s after leaving the slide. ignoring friction and air resistance, find the height H in the drawing.

* sorry about the second question. i cant really draw the picture. but the answer for that question is 6.33 m. i dont know how they got that. :[[

2007-10-28 15:42:42 · 1 answers · asked by Amy C 1 in Physics

a brick is positioned first with its largest surface in contact with an inclined plane. the plane is tilted at an angle to the horizontal until the brick just begins to slide, and the angle,0, of the plane with the horizontal is measured. then the brick is turned on one of its narrow edges, the plane is tilted, and 0 is again measured. predict whether there will be a difference in these measured angles.

2007-10-28 15:42:09 · 3 answers · asked by aznedisonx 3 in Physics

If a planet is orbiting a two star system how do scientists figure out what length of time is a year for that planet?

2007-10-28 15:39:58 · 5 answers · asked by BRE 1 in Astronomy & Space

hey i need help figuring out what are three types of the following simple machines and how do you use them?
Inclined Plane.
Wedge.
Screw.
Lever.
Pulley.
Wheel and Axel.
Please and Thank You (no this is not a simple machine lol)

2007-10-28 15:39:56 · 3 answers · asked by Anonymous in Engineering

become polluted with ocean water long before the coastline begins to rise? Pls: GEOLOGIC answers, not Bushwax.

2007-10-28 15:39:46 · 1 answers · asked by te144 7 in Geography

thanksss =]

2007-10-28 15:39:03 · 5 answers · asked by put yur fangs up cobra style! 2 in Mathematics

I understand a lot of this if i can get started. But sometimes im used to matrices and its a function, in this case its very odd to me. the question is as follows ...

Determin if the given function T is a linear transformation. Also find A such that T = F(a).

The function is
T:P2 -> by T(A0 + A1x + A2x^2) = (A0 + A2) + 2A1x + (A1 + A2)x^2

I cant even figure out how to start it. I know we need to prove T(u+v), T(u) + T(v), T(ru). Thanks for your help/time.

2007-10-28 15:38:26 · 1 answers · asked by BasAndit 1 in Mathematics

for example 1/2+3/5

2007-10-28 15:36:39 · 29 answers · asked by Nustche 2 in Mathematics

1) The linear sequence of monomers in a polypeptide chain is referred to as its____structure.

a)quaternary
b)secondary
c)tertiary
d)pentamerous
e)primary

2)In eukaryotic cells, waht name is given to the region between the nucleus and the plasma membrane?

a)cytoplasm
b)nucleoplasm
c)phospholipid bilayer
d)gane
e)cytosol

3.
Isotopes of an element have the same number of___ and different number of ____.

a)electrons...protons
b)protons...neutrons
c)neutrons...protons
d)protons electrons
e)neutrons...electrons

4. when water dissociates, what is tranferred from one water molecule to form a hydronium ion?

a)a hydrogen atom
b)H3O+
c)OH-
d)H2O
e)a hydrogen ion

5.nitrogen has an atomic number of 7; therefore it has ____electrons in its ouermost electron shell.

a)2
b)1
c)5
d)10
e)18

2007-10-28 15:31:53 · 1 answers · asked by kk^Q^ 7 in Biology

Why concrete and stone and brick are rarely used to build houses in the US?
Don´t you think that with so many hurricanes and wild fires in the time to come due to the planet warming it´s necessary to think in other more resistant materials for construction?

2007-10-28 15:29:10 · 6 answers · asked by MrK 1 in Engineering

sulfur with iron mixed up, and iron (II) sulfide...

it states that matter is not created nor destroyed, the mass of combination before and after heating (sulfur with iron) should have been the same. What could have caused the % difference?

2007-10-28 15:27:19 · 4 answers · asked by Juan C 6 in Physics

I know what the answer is, but I don't know how to get there.
All I have is:
f'(x) = sqrt(1 - x^2) - (x^2)/(sqrt(1 - x^2)
= ((1-x^2) - x^2)/(sqrt(1 - x^2))
= (1 - 2x^2)/(1 - x^2)

How do they get to the first step? I feel like they skiped a bit to save paper so now I am confused. :/

2007-10-28 15:25:50 · 2 answers · asked by wicky034 2 in Mathematics

what is the current barometric pressure in los angeles, in atm?

2007-10-28 15:24:45 · 3 answers · asked by Anonymous in Weather