Science & Mathematics - 21 October 2007

A. sister chromatids
B. metaphase plate
C. contractile ring
D. mitotic spindle

2007-10-21 16:44:52 · 3 answers · asked by dreams 2 in Biology

help please

2007-10-21 16:43:27 · 2 answers · asked by Anonymous in Biology

At what angle should the gun be aimed so the target will be hit?

2007-10-21 16:40:41 · 2 answers · asked by TiTi 1 in Physics

If this speed were increased by just 5.0 percent, how much longer would the jump be?

2007-10-21 16:39:08 · 1 answers · asked by TiTi 1 in Physics

I really need help in math, can anyone please help me...

The revenue of Portside Fish Shanty, located at a popular summer resort, is approximately
R(t) = 2(5 -4 cos 6(π/6) t
;

where 0≤ t ≤12, t is measured in weeks with t = 1 corresponding to the first week of June, and R is measured in thousands of dollars.The cost function, over the same interval of time, is given by
C(t) = 1 + (2π/3) t ;

and it is also measured in thousands of dollars.

(a) Find the intervals of increase and decrease of R(t).
(b) Find the intervals of increase and decrease of C(t).
(c) Find the intervals of increase and decrease of the profit functionP(t).
(d) At what value of t is the prot maximized? What is this maximum profit? You must fully justify your answer .

For this question, part a, do i have to change the cos to a actual number so i can solve for the critial numbers?
and for this, there is only one critial number? So what to do with one critial number?

Thanks!

2007-10-21 16:38:30 · 1 answers · asked by Anonymous in Mathematics

this is a type of problem that i'm having trouble with:

A student added 50.0 ml of an NaOH solution to 100.0 ml of 0.400M HCl. The solution was then treated with an excess of aqueous chromium(III) nitrate, resulting in formation of 2.06 g of precipitate. Determine the concentration of the NaOH solution.

if you can figure out the answer and explain it a bit that would be great and i will offer you my respect and gratitude. i tried and got 1.932 M NaOH, but i think i did it wrong, so i would like to compare answers.

2007-10-21 16:36:15 · 1 answers · asked by dude 1 in Chemistry

tell me a equation with as many vairibles as u like impossible to be equal. but it cant have obvious things wrong with it like using a divide by zero but more technicalitys. i dont think there is one but.. lets see

2007-10-21 16:34:58 · 6 answers · asked by Anonymous in Mathematics

(x^2/x+10) plus (14x+40/x+10)
Ok does this make since to anyone? I get mixed up when there are powers and fractions together.

2007-10-21 16:32:18 · 3 answers · asked by meme 1 in Mathematics

A. alignment of chromosomes at the cell equator
B. DNA replication
C. interphase
D.cytokinesis
E. packing of DNA into well-defined chromosomes

2007-10-21 16:30:24 · 3 answers · asked by dreams 2 in Biology

2007-10-21 16:29:42 · 4 answers · asked by editing whiz 2 in Astronomy & Space

2007-10-21 16:28:20 · 2 answers · asked by Anonymous in Medicine

In test tube A there is ethanoic acid + ethanol -> ethylethanoate but no drops of sulfuric acid. In test tube B - same thing, but with 3 drops of sulfuric acid. Do the smells differ?

2007-10-21 16:28:07 · 2 answers · asked by Anonymous in Chemistry

http://i20.tinypic.com/b6yr8z.jpg

please help me.. i've been struggling with this for like an hour now...

i need to multiply those together and simplify...

thank you..

2007-10-21 16:27:57 · 6 answers · asked by lalalallalalllal 2 in Mathematics

Given latitude and the time of year, how do you calculate day length? Am I right in understanding that day length changes fastest around the equinoxes and slowest around the solstices, so linear regression is not possible.

2007-10-21 16:25:11 · 4 answers · asked by Anonymous in Astronomy & Space

I have read repeatedly that astronomically we are moving into the Age of Aquarius. So my question is 2 parts:
1: What exactly does this mean?
2: What, (if any) affect will it have on us?

2007-10-21 16:24:12 · 5 answers · asked by Reiki Chick 6 in Astronomy & Space

Ca3(PO4)2(s) + 5C(s) + 3SiO2(s) ---> 3CaSiO3(s) + 5CO(g) +2P(l)

An initial reaction mixture contains 1500kg calcium phosphate, 250kg carbon, and 1000kg SiO2.

After the reaction the slag was analized. It contained 3.8%C, 5.8%P, and 26.6%Ca by mass. What was the actual yield of phosphorus in Kg? what is the % yield?

(to save time: C is the limiting reactant and the theoretical yield of P is 257.8Kg, according to my calculations)

2007-10-21 16:19:52 · 1 answers · asked by dude 1 in Chemistry

a student put some cells from a tomato plant on a microscope slide, aded a drop of water and observed them under the microscope.after 15 minutes,the cells appeared to be fully expanded.when the student put some blood cell in water on a microscope slide and examined it under high power, no cell could be detected in the sample.what explanation can u suggest for this?

2007-10-21 16:17:20 · 4 answers · asked by jayscanty 2 in Biology

Is there anyway to make it so its not all stuck together in a block, and I can pour it again?

2007-10-21 16:16:08 · 5 answers · asked by Anonymous in Chemistry

2007-10-21 16:12:46 · 2 answers · asked by celinuchis90 3 in Earth Sciences & Geology

In test tube A there is ethanoic acid + ethanol -> ethylethanoate but no drops of sulfuric acid. In test tube B - same thing, but with 3 drops of sulfuric acid. Do the smells differ?

2007-10-21 16:11:31 · 1 answers · asked by Anonymous in Chemistry

There are two blocks connected by a sting and tied to a wall. The mass of the lower block is 1 kg; the mass of the upper block is 2 kg. Given that the angle of the incline is 31 degrees, find the tension in (a) the string connecting the two blocks and (b) the string that is tied to the wall.

2007-10-21 16:10:49 · 2 answers · asked by mmeee 1 in Physics

2007-10-21 16:10:26 · 23 answers · asked by Anonymous in Mathematics

a) Prove that the derivative of an even function is an odd function
b) Prove tha the derivative of an odd function is an even function

Any help is apreciated!

2007-10-21 16:10:25 · 1 answers · asked by alanis118 1 in Mathematics

i have a test tomorrow and this is a type of problem that i'm having trouble with:

A student added 50.0 ml of an NaOH solution to 100.0 ml of 0.400M HCl. The solution was then treated with an excess of aqueous chromium(III) nitrate, resulting in formation of 2.06 g of precipitate. Determine the concentration of the NaOH solution.

if you can figure out the answer and explain it a bit that would be great and i will offer you my respect and gratitude.

2007-10-21 16:10:25 · 3 answers · asked by dude 1 in Chemistry

Big Bang theory, the last days of the dinosaurs, man coming from monkey and some getting their start as fish?

2007-10-21 16:08:45 · 3 answers · asked by mishpocha 4 in Earth Sciences & Geology

2007-10-21 16:06:53 · 4 answers · asked by nancy c 1 in Weather

2007-10-21 16:06:52 · 2 answers · asked by Berry Nice 2 in Biology

2007-10-21 16:06:20 · 1 answers · asked by C'est Comme Un Rêve 3 in Chemistry

2007-10-21 16:05:18 · 10 answers · asked by alawrence108 1 in Mathematics

Comment on this claim.

2007-10-21 16:05:14 · 6 answers · asked by nancy c 1 in Other - Science