Science & Mathematics - 18 September 2007

To get oil from the crude oil, polymer has been used. what is the role of polymer and how to get rid of it from the waste water?

2007-09-18 09:25:00 · 1 answers · asked by Heseri 1 in Engineering

a 100g sample of a fertilizer contains .0705 moles of p2o5 and .106moles of k2O how many moles of p and k are in the sample.

please explain how

thanks

2007-09-18 09:21:02 · 4 answers · asked by ilikegcalot 1 in Chemistry

If I were to measure the densities of a block using length, width, and height...How would the calculations change if the block was actually hallow?

Im guessing the mass is changed which changes the desnity calculation? Thx..

2007-09-18 09:20:58 · 2 answers · asked by kat 3 in Chemistry

2007-09-18 09:19:08 · 1 answers · asked by Anonymous in Botany

A ball rolls horizontally off the edge of a tabletop that is 1.11 m high. It strikes the floor 2.80 m away from the edge of the table. What is the initial (horizontal) velocity of the ball?

2007-09-18 09:17:35 · 3 answers · asked by jim m 3 in Physics

here is my physics problem. this is all the information i have been given and i really have no clue how i can use it to solve the problem.... In an egg-dropping contest, a student encases an 85g egg in a styrofoam block. If the force on the egg is not to exceed 1.5N , and if the block hits the ground at 1.2m/s, by how much must the styrofoam crush?

any help would be GREATLY appreciated!

2007-09-18 09:17:13 · 2 answers · asked by Anonymous in Physics

A dolly and its wheels have negligible mass.
The object on the dolly weighs 304 N and
the force on the rope is 23 N. The
acceleration of gravity is 9.8 m/s/s.

If a person pulls on the rope with a
constant force what is the
acceleration of the system? Answer in
units of m/s/s.

How far will it move in 3.29 s?
Answer in units of m.

2007-09-18 09:15:06 · 1 answers · asked by josh j 1 in Physics

Why should the thermometer be above the side arm of the three way collecting tube?

2007-09-18 09:14:29 · 1 answers · asked by Anonymous in Chemistry

When I squish them, red juice comes out. Kinda looks like blood

thanks!

2007-09-18 09:11:08 · 1 answers · asked by ♫ ali 5 in Botany

2007-09-18 09:08:39 · 3 answers · asked by Anonymous in Physics

V= 4/3(3.14(radiuscubed) The ft need tobe converted to liters before it can be cubed and i'm having a hard time trying to find something to convert ft to Liters. Can anybody help?

2007-09-18 09:05:41 · 2 answers · asked by flo_town02 1 in Chemistry

A ball is thrown vertically upward with a velocity of +13.0 m/s.

(a) How high does it rise?

(b) How long does it take to reach its highest point?

(c) How long does the ball take to hit the ground after it reaches its highest point?

(d) What is its velocity when it returns to the level from which it started?

2007-09-18 09:03:02 · 1 answers · asked by Foxychick 1 in Physics

How does a INVASIVE blood pressure montior work and what is one actually (if you had to define it)

2007-09-18 09:02:44 · 3 answers · asked by meeee m 1 in Medicine

2007-09-18 09:02:12 · 12 answers · asked by david m 2 in Astronomy & Space

If a distillation exp were done on top of a mountain hopw would the temperature be affected and why?

2007-09-18 09:00:50 · 3 answers · asked by Anonymous in Chemistry

2007-09-18 08:59:28 · 6 answers · asked by Anonymous in Biology

Here is the problem-- A glider is moving a velocity vector Vg = 40m/s i - 24 m/s j when it enters the wind current Vw that blows due south with a constant speed of 20 m/s.

1) What is the i/j equation of Vw

2) What is the i/j equation for the gliders resultant velocity, and in what quadrant is the gliders velocity vector

3)What is the magnitude of the gliders new velocity vector

4) In what direction (in degrees) does the glider now head

5) What is the new azimuth of the glider

Ok, now i am completely lost and i have no CLUE what to do. I am not asking for the answers but an explanation of how to do each problem. Thanks

2007-09-18 08:57:35 · 1 answers · asked by Anonymous in Physics

Theresa worked 9 hours on Monday and 7 hours on Wednesday. Her total pay was $116.00. What is her rate per hour?

A. $7.25
B. $12.89

C. $8.29

D. $16.57

2007-09-18 08:57:27 · 20 answers · asked by Ana Z 1 in Mathematics

2007-09-18 08:57:00 · 6 answers · asked by david m 2 in Astronomy & Space

If Eratosthenes had measured the angle between the Sun and the zenith to be 5 degrees, the Earth’s circumference would be


a. 250, 000 stadia

b. 200, 000 stadia

c. 5, 000 stadia

d. 360,000 stadia

2007-09-18 08:56:00 · 2 answers · asked by Binky 3 in Astronomy & Space

My mother is preparing to donate one of her kidneys to a friend with polycystic kidney disease who is currently on dialysis. I should mention that the friend is on the transplant list, but they think it will take at least two more years.

Does anybody out there have personal experience with kidney donation, especially regarding the risks for the donor? Also, my mom was tested for compatibility, and the only match is the blood type--none of the other antigens are the same. I thought this would lead to rejection, but the doctors assured my mother that the anti-rejection drugs are really good and the kidney will probably not be rejected. However, they might be trying not to discourage her from donating, and may not be the most reliable sources.

I feel nervous about the risks to my mom, especially when the kidney might be rejected. Any thoughts on this?

I would also appreciate it if you could give me the sources of your information so that I can do some reading. Thanks!

2007-09-18 08:52:49 · 13 answers · asked by Melissa P 3 in Medicine

i need to know for a practice exam paper im having trouble with

2007-09-18 08:51:12 · 15 answers · asked by joebeina 1 in Engineering

An oceanic depth-sounding vessel surveys the ocean bottom with ultrasonic waves that travel 1530 m/s in seawater. How deep is the water directly below the vessel if the time delay of the echo to the ocean floor and back is 7 s?


answer in units of m

2007-09-18 08:50:45 · 3 answers · asked by Anonymous in Mathematics

2007-09-18 08:50:26 · 1 answers · asked by Anonymous in Mathematics

Reduce the following expression to lowest terms:

w^2 - 7w - 8
-----------------
3w^2 + 27w + 24

2007-09-18 08:44:52 · 9 answers · asked by rebeccapolsh333 2 in Mathematics

-What fire triangle factor does this remove from the frying pan fire?
-Why do you never put water on a fyring pan fire?

2007-09-18 08:44:13 · 11 answers · asked by MaeMae 1 in Chemistry

2007-09-18 08:43:17 · 7 answers · asked by Anonymous in Mathematics

2007-09-18 08:39:46 · 1 answers · asked by Anny P 1 in Mathematics

Find their present ages

2007-09-18 08:39:04 · 6 answers · asked by thealphadude1992 2 in Mathematics

i need help on a few questions please show me how its done
1. a teacher has 5 packets of mints and 6 single mints , the number of mints in each packet are the same .
can you help me on how to write an expression to show how many mints there are together. call the number in each pack "y"

please help me i havnt got a clue how to do it please!
thank you

2007-09-18 08:34:29 · 8 answers · asked by Anonymous in Mathematics