Science & Mathematics - 28 October 2007

This is a Trick Question and I know the answer.

2007-10-28 06:23:11 · 8 answers · asked by Anonymous in Mathematics

astronomical aspect please

2007-10-28 06:22:29 · 4 answers · asked by hasan botaj 1 in Astronomy & Space

It is hard to find a concise breakdown of the cons of Solar. Every article I come across seems to be a sales pitch. My husband is enamored with it, but I have serious reservations. What is the cost to install on the average house?
Is the whole sell-back thing really what it's cracked up to be?
What about maintenance cost?
I live in PA; would I have power available ANY time I need it?
Any other info you have is also appreciated.

2007-10-28 06:21:27 · 3 answers · asked by mel1026 3 in Other - Science

2007-10-28 06:21:06 · 1 answers · asked by Maggie 1 in Chemistry

2007-10-28 06:19:46 · 30 answers · asked by Anonymous in Physics

2007-10-28 06:18:56 · 3 answers · asked by onexkrazextiff 1 in Other - Science

http://i24.tinypic.com/dbl16b.jpg

I really need help to figure out how to do the two questions above and Id really like to know how to solve them and not just get the answer so can someone please help explain them to me?

2007-10-28 06:18:47 · 1 answers · asked by ... 1 in Mathematics

Why did we use a glowing splint instead of a burning splint?
The experiment was to place 5mL of hydrogen peroxide, in a test tube. Add a pinch of manganese dioxide. And test the gas that is given off with the glowing splint.

What gas were we testing for with the glowing splint? Oxygen?

2007-10-28 06:13:14 · 5 answers · asked by tooooodles 3 in Chemistry

Here's the info I have:
.4063 g KHP
Titrated 17.93 mL of NaOH into the KHP solution
Mole ratio KHP:NaOH, 1:1

10 mL H2SO4
Titrated 26.39 mL NaOH into the acid
Mole ratio NaOH:H2SO4 is 2:1

Please help me!

Part 1 - Standardization
1. Calculate the moles of KHP from mass weighed out.
2. Calculate the moles of NaOH that would react with the KHP.
3. Calculate the concentration of NaOH using titration volume.

Part 2 - Titration of Acid
1. Calculate the moles of NaOH delivered from buret
2. Calculate the moles of acid that would react with the NaOH
3. Calculate the concentration of acid using sample volume.

2007-10-28 06:12:30 · 2 answers · asked by Anonymous in Chemistry

I'm doing a science project on the affects of detergent on plant growth, I've done everything but the bibliography, where is the best place to look for information on the subject??

2007-10-28 06:12:16 · 4 answers · asked by Destiny 1 in Other - Science

Counting the length L and the width d of an oblong square we find the following numbers:

L: 24.25 / 24.26 / 24.22 / 24.28 / 24.24 / 24.25 / 24.22 / 24.26 / 24.23 / 24.24

d: 50.36 / 50.35 / 50.41 / 50.37 / 50.36 / 50.32 / 50.39 / 50.38 / 50.36 / 50.38

Measure the surface of the oblong square and the "mismeasure" with 2 ways:

a) From Li, di calculate δL and δd and S and δS.
b) From Li and di, calculate Si and then δS

Please help me with this, and I do not want just the answer, I want the whole solution as well so as to understand it.. Thanks in advance!

2007-10-28 06:08:59 · 1 answers · asked by hoot_dude 2 in Physics

please explain this to me, b/c i can't remember it and i don't have my book with me! thanks!

2007-10-28 06:08:23 · 3 answers · asked by Anonymous in Chemistry

2007-10-28 06:05:23 · 1 answers · asked by Anonymous in Mathematics

what are the steps to find the heat released in this problem?
and is the formula q=mc(deltaT)

36.0g of steam at 100.0degrees celcius(sp?) was condensed to water and cooled to 25.0degrees celcius(sp?). Find the heat released.

2007-10-28 06:05:18 · 2 answers · asked by Anonymous in Chemistry

There's A Special Protein In fishes body,Which peotects them against freezing...I wanna know more about it...Plz help me to find out...

2007-10-28 06:04:44 · 2 answers · asked by Anonymous in Other - Science

A model rocket is fired vertically upward from rest. Its acceleration for the first three seconds is a(t) = 60t at which time the fuel is exhausted and it becomes a freely "falling" body. Fourteen seconds later, the rocket's parachute opens, and the (downward) velocity slows linearly to -18 ft/s in 5 s. The rocket then "floats" to the ground at that rate.

a) At what time does the rocket reach its maximum height?

What is that height?

b) At what time does the rocket land?

2007-10-28 06:04:22 · 2 answers · asked by ark_in_space 1 in Physics

here is a problem with solution.
http://docs.google.com/Doc?id=dc83hzcs_262dbzhxw

i have some doubts in the solution.

can you please clarify ?

2007-10-28 06:03:48 · 2 answers · asked by calculus 1 in Mathematics

what the different between central air conditioners and air conditioners?? please if you don't know don't answer.

2007-10-28 06:03:09 · 3 answers · asked by Anonymous in Engineering

A bomb calorimeter has a heat capacity of 843 J/°C and contains 473 g of water. If the combustion of 0.500 mole of a hydrocarbon increases the temperature of the calorimeter from 22.73°C to 26.95°C, determine the heat evolved per mole of hydrocarbon.

A. 8.38 kJ
B. 23.8 kJ
C. 76.0 kJ
D. 95.9 kJ
E. 8380 kJ


Can someone just Explain the steps?

2007-10-28 06:02:09 · 1 answers · asked by Anonymous in Chemistry

2007-10-28 06:01:50 · 1 answers · asked by maxandmar100 1 in Botany

What is the enthalpy change when 22.5 g of CH4 are burned in excess O2?
CH4(g) + 2O2(g) ------>CO2(g) + 2H2O(l) DH°= -890 kJ

A. -39.5 kJ
B. -890 kJ
C. -1250 kJ
D. +890 kJ
E. +1250 kJ
no need to solve, How do you know?

2007-10-28 06:01:12 · 1 answers · asked by Anonymous in Chemistry

1. what is organic chemistry?
2. is it good or bad? Why?

that's all. I have to write a paper and I am still not sure what organic chemistry is and whether it is good or bad.

your help is appreciated.

2007-10-28 05:59:11 · 2 answers · asked by greenpink413 2 in Chemistry

2007-10-28 05:57:43 · 6 answers · asked by Anonymous in Astronomy & Space

I mean, to give a sample of blood to be examined?

(While at this, which is the correct term in English: a blood analysis or a blood examination?)

2007-10-28 05:57:26 · 2 answers · asked by Anonymous in Medicine

2007-10-28 05:57:12 · 5 answers · asked by chance612000 1 in Agriculture

Big bangers meet and agree,"It's really very simple, compression to singularity=boom=soup=life and then naturally occuring evoloution. Above 200 medical scientist from around the world after much peering thru their powerful microscopes at the aids virus agree it's so complex we just don't know.......

2007-10-28 05:53:47 · 3 answers · asked by james h 2 in Astronomy & Space

whats the difference?

2007-10-28 05:48:01 · 1 answers · asked by yukino 1 in Engineering

Assume that we are in another universe with different physical laws. Electrons in this universe are described by 4 quantum numbers with similar meanings to the ones we use. We call them a,b,c and d. The rules are: a=1,2,3,4,5 ...
b takes on positive odd integers and b is less than or equal to a.
c takes on all even integer values from -b to +b and zero is considered even.
1) sketch what the 1st four periods of the periodic table will look like in this universe.

2007-10-28 05:46:36 · 1 answers · asked by Anonymous in Chemistry

Hello everyone.

I am not very sure of this proof for my homework. If someone can help me I would be very happy.

-Police radar detects the speed of a car. Microwaves of a precisely known frequency are broadcast toward the car. The moving car reflects the microwaves with a Doppler shift. The reflected waves are recieved and combined with an attenuated version of the transmitted wave. Beats occur between the two microwave signals. The beat frequency is measured.
For an electromagnetic wave reflected back to its source fomr a mirror approaching at speed v, show that the reflected wave has a frequency:
f = fsource * (c+v) / (c-v)

O_O

2007-10-28 05:44:55 · 1 answers · asked by Park Jung Suk 1 in Physics

of.....
P(x)= (2x - 3)^7 (x+4)^8.

For each intercept determine whether the graph crosses the x-axis or intersects the x-axis without crossing it.

2007-10-28 05:39:00 · 3 answers · asked by K Rose 3 in Mathematics