Science & Mathematics - 29 October 2007

By means of a rope whose mass is negligible, two blocks are suspended over a pulley, as the drawing shows, with m1 = 12.2 kg and m2 = 43.4 kg. The pulley can be treated as a uniform, solid, cylindrical disk. The downward acceleration of the 43.4 kg block is observed to be exactly one-half the acceleration due to gravity. Noting that the tension in the rope is not the same on each side of the pulley, find the mass of the pulley.

Image: http://www.webassign.net/CJ/p9-42alt.gif

Anybody have any idea how to do this?

I would appreciate any help.

Thank You.

2007-10-29 04:15:02 · 2 answers · asked by Anonymous in Physics

please show steps can't seem to figure this out

(6a^12y^5)(2ay^10)

2007-10-29 04:11:10 · 3 answers · asked by Anonymous in Mathematics

I've heard of gasoline and other things described with the adjective "high test". What does this mean exactly?

2007-10-29 04:10:55 · 4 answers · asked by Anonymous in Other - Science

2007-10-29 04:10:49 · 2 answers · asked by taha r 1 in Weather

Please help answer...

3x^2+20x+17

factor completely...

2007-10-29 04:09:55 · 6 answers · asked by It's a girl due 5/11/09 4 in Mathematics

What are the height length and wodth?
A website would be great as well!
Thanks

2007-10-29 04:08:56 · 0 answers · asked by Anonymous in Engineering

2007-10-29 04:05:02 · 8 answers · asked by niceguy 2 in Mathematics

Louise sold some chickens on the internet for £94.50
She calculated that she made a profit of 26% on the cost price of the chickens.
However, when doing her calculation she forgot that she spent £3.50 on the postage for the chickens.
Work out her correct percentage profit.

2007-10-29 04:02:37 · 2 answers · asked by jimquan 1 in Mathematics

I found them in my yard and I dont want my puppy to get them.

2007-10-29 03:59:49 · 5 answers · asked by jennym 1 in Botany

At an altitude of 10000m (about 33000 ft.), the air pressure outside the airplane is only 2.7 x 10 to the 4th power N/m squared, while inside is still at normal atmospheric pressure, due to pressurization of the cabin. Calculate the net force due to the air pressures on a door of area 3.0 m squared. If you can show me how you got the answer so I understand it I'd appreciate it.. Thank you

2007-10-29 03:57:16 · 2 answers · asked by Anonymous in Physics

if light passes through a prism or some other obsticle, is it "injured" from this or does it just go on divided in each of the color spectrums?

2007-10-29 03:54:48 · 2 answers · asked by ? 6 in Physics

If a rock falls from a height of 20 meters on the planet Jupiter, then its height (H) after T (t= seconds) is approx:

H(t)= 20-13t^2

What is the average velocity of the rock from t=0 to t=1
What is the instantaneous velocity at time t=1
What is the acceleration of the rock?
When does the rock hit the ground?

I have no idea when the damn rock hits the ground! lol. something to do with the acceleraion of gravity.

2007-10-29 03:51:56 · 8 answers · asked by girlygirl 1 in Mathematics

(question continued) "from a hot solution?"

2007-10-29 03:50:34 · 1 answers · asked by Anonymous in Physics

How do you figure out the square footage of something.
If you have a 1/4" x 48" x 10' slab - how may square feet is it?

2007-10-29 03:47:59 · 7 answers · asked by kimmer727 5 in Mathematics

2007-10-29 03:46:25 · 1 answers · asked by anti_move 1 in Earth Sciences & Geology

i have this project for chemistry, and i have to do a research paper on migraines. i've found all the information i need for all the sections, except for section one.

i've been looking and looking online, and i can't find any information on this:
-name the person or persons who discovered the disorder or who completed significant research on the disorder
-give the date(s) of the discovery of the disorder
-describe the events or procedures that lead to the discovery of research on this order

please help, and help me find some great websites! [remember, this is for migraine headaches...]

2007-10-29 03:43:01 · 2 answers · asked by Anonymous in Medicine

2007-10-29 03:38:09 · 2 answers · asked by anti_move 1 in Earth Sciences & Geology

Carry out the following steps to sketch the graph of
f(x) = x / (1 + x^2) :
(a) Find the local maxima and minima of f. Compute the local maximum and minimum values. Give the intervals of increase and decrease.
(b) Find the infection points of f. Give the intervals where f is concave upward and
where f is concave downward.
(c) Determine if f is even or odd.
(d) Find lim as x approaches infinity of f(x) and lim as x approaches infinity of f(x).
(e) Make a careful sketch of the graph of f that reflects the above information.

2007-10-29 03:37:33 · 1 answers · asked by bradm_127 1 in Mathematics

45 cm height by an outside supply. a) What is the speed of the water out of each hole? b) Which water stream has the greatest range relative to the base of the container? If you could show me the process of getting the answer so I understand it I'd appreciate it. Thank you

2007-10-29 03:34:58 · 1 answers · asked by Anonymous in Physics

doesnt it? it even turns darker

2007-10-29 03:33:24 · 5 answers · asked by kevin 1 in Weather

My dog is 59 days pregnant and we have a digital thermometer that is currently reading 38.6 celsious, it has gone up and down since yesterday and i'd just to know what is 38.6 c in farenheit? Also what temperature reading is 98 - 100 degrees Farenheit if you convert it to celsious?

Thanks in advance!

2007-10-29 03:32:47 · 4 answers · asked by Anonymous in Mathematics

Her first name started with a S.

2007-10-29 03:16:20 · 13 answers · asked by Destiny R 1 in Astronomy & Space

Butane, C4H10, is a component of natural gas that is used as fuel for cigarette lighters. The balanced equation of the complete combustion of butane is:

2C4H10(g) + 13O2(g)->8CO2(g) + 10H2O(l)


At 1.00atm and 23*C , how many liters of carbon dioxide are formed by the combustion of 1.00g of butane?

For the above...I have converted 1g of butane=0.017204mol (1g*1mol/58.1234gC4H10) = 0.017204mol C4H10
Then: mol CO2= 1g*1mol/44.011g = 0.2272mol CO2
(if these are the correct initial approach????)

The temp=23*C + 273.15K = 296.15K
The Volume=????
Constant R I will use is: 0.082058L atm mol K
n...?????

I know that I should somehow divide the 8moles of CO2 with the 2moles of C4H10...but not sure how to do this. I tried 0.547L as an answer but it wasn't correct.

Please help and point out what I was doing incorrectly. I thought that I had it figured, but I figured incorrectly.
Thank you in advance!!

2007-10-29 03:14:30 · 2 answers · asked by Anonymous in Chemistry

for school >> need help :p

2007-10-29 03:13:39 · 3 answers · asked by B G 1 in Geography

2007-10-29 03:01:42 · 10 answers · asked by meone 1 in Engineering

2007-10-29 02:57:40 · 42 answers · asked by Anonymous in Astronomy & Space

Does it exist everywhere and consume the areas around planets and stars or is it something that is gigantic, but exists beyond our telescope range?

2007-10-29 02:54:50 · 5 answers · asked by Balrog 2 in Astronomy & Space

2007-10-29 02:54:49 · 4 answers · asked by babbygril_69 1 in Chemistry

Simplify the expression:

(4 + sqrt2)^2

Thanks for all of your help.

2007-10-29 02:53:59 · 5 answers · asked by lexismom2005 1 in Mathematics

2007-10-29 02:49:49 · 3 answers · asked by harry potter 2 in Physics