Science & Mathematics - 14 January 2007

2007-01-14 19:51:16 · 4 answers · asked by u_tubby_little_tit_witch 2 in Geography

2007-01-14 19:48:51 · 1 answers · asked by aktulpar 1 in Earth Sciences & Geology

2007-01-14 19:48:21 · 3 answers · asked by chaque 1 in Chemistry

A hot air balloon is tethered to the ground on a windless day. The envelope of the balloon contains 1200m^3 of hot air of density 0.8kg/m^3. The mass of the balloon (not including the hot air) is 400kg. The density of the surrounding air is 1.3kg/m^3.

I am having trouble with questions concerning tension, and I have no idea how to calculate it using F=ma, since acceleration is not mentioned.

2007-01-14 19:43:30 · 1 answers · asked by Emily K 2 in Physics

If the highest point in a landscape is 2,000 meters above sea level and the lowest point in the same landscape is 500 meters above sea level, what is the relief of the landscape?

2007-01-14 19:39:19 · 4 answers · asked by bethany 2 in Geography

I think, the end of the World after very long years.There will haven`t any living organism.

2007-01-14 19:33:31 · 16 answers · asked by Rajendran 2 in Earth Sciences & Geology

2007-01-14 19:30:18 · 6 answers · asked by Yan 1 in Chemistry

2007-01-14 19:29:50 · 10 answers · asked by gabeymac♥ 5 in Geography

This whole theory of Monism. Is there any way to scientifically prove it?

2007-01-14 19:27:27 · 5 answers · asked by Emily 2 in Physics

1. determine the value of h,r and hence calculate the ratio of h/r when the total surface area of each tin is minimum.here,h cm denotes the height and r cm the radius of the tin.
2. the t0p and bottom pieces of height h cm are cut from square-shape aluminium sheets.
determine the value for r,h and hence calculate the ratio h/r so that the total area of the alumium sheets used for making the tin is minimum.(refer to the diagram the aluminium sheets used for making the tin is minimum.
3. investigate cases where the top and bottom surfaces are cut from;
i)equilateral triangle.
ii)regular hexagon.
find the ratio of hj/r for each cases.

further investigation
investigate cases where the top and bottom faces of the tin are being cut from aluminium sheets consisting shapes of regular polygons.from the results of your investigation,what conclusion can you derive frrom the relationship of the ratio h/r and the number of sides of a regular polygon?

2007-01-14 19:26:57 · 5 answers · asked by lonely gurl 1 in Mathematics

2007-01-14 19:26:44 · 4 answers · asked by Anonymous in Geography

....why is it that the dust and rocks that make up Saturn's rings, the Kuiper belt and Oort cloud don't behave in the same way?

Why don't they clump together to form another single body?

I expect the answer is extremely obvious, but it's a genuine question.

Thanks

2007-01-14 19:22:41 · 15 answers · asked by Hello Dave 6 in Astronomy & Space

2007-01-14 19:21:23 · 6 answers · asked by Gonzales 1 in Astronomy & Space

2007-01-14 19:20:08 · 10 answers · asked by smm2424 2 in Mathematics

2007-01-14 19:19:41 · 8 answers · asked by deepak57 7 in Chemistry

What do 5' and 3' stand for in DNA?

2007-01-14 19:18:20 · 5 answers · asked by bluesky8 1 in Biology

I am testing which salt (sodium chloride, magnesium sulfate, sodium bicarbonate) is the strongest electrolyte. I have to make a hypothesis, and I don't know why one would be the strongest electrolyte. I know it would have something to do with the greater amt. of ions in the solution the stronger the electrolyte it is, but I don't know which one contains the most ions. If anyone knows please tell me and leave an internet site source that says. I have done all types of research, but can't figure it out. Please, Please, Please help it is urgent!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

2007-01-14 19:16:59 · 2 answers · asked by ellen105 2 in Chemistry

2007-01-14 19:10:51 · 1 answers · asked by c_lok 1 in Engineering

how did the book get
T=1/f=1/262hz = 0.00382s

I need an explainization on how to do this beacuse i have a final in two days and my teacher didn't explain it well plz help

2007-01-14 19:09:12 · 3 answers · asked by killerpunjabi2008 1 in Physics

The actual yield is 1.15 cm, and I need the maximum yield in centimeters, too. If it helps, the 0.001 moles of Pb(NO3)2 are equivalent to 2 mL, and the 0.008 moles of NaI are equivalent to 16 mL.

Please Help!

2007-01-14 18:58:58 · 3 answers · asked by theweirdguy1 2 in Chemistry

2007-01-14 18:49:37 · 12 answers · asked by Anonymous in Physics

2007-01-14 18:48:02 · 14 answers · asked by Anonymous in Mathematics

The car shop is 655 meters from the Smoothie Store, 393 Meters from the library, and 314 meters from the Parlour. The library is 236 meters from the Parlour and 524 metres from the Smoothie Store.

Assuming the distance between the Parlour and the Smoothie Store is less than the distance between the car shop and the Smoothie Store, what is the distance between the Parlour and the Smoothie Store? Please round to the nearest meter!!


{{{this makes like no sense to me can you help plz.}}}

2007-01-14 18:41:06 · 11 answers · asked by Alex V 1 in Mathematics

Help is greatly appreciated.

2007-01-14 18:39:55 · 2 answers · asked by theweirdguy1 2 in Chemistry

2007-01-14 18:39:32 · 2 answers · asked by Anonymous in Engineering

the kelvin scale has no starting point so how do we know its freezing or boiling?

2007-01-14 18:38:34 · 9 answers · asked by totalangel24 1 in Chemistry

2007-01-14 18:37:32 · 17 answers · asked by Anonymous in Earth Sciences & Geology

I need to know pretty soon. Thanks.

2007-01-14 18:35:55 · 19 answers · asked by Anonymous in Paranormal Phenomena

tan(a)/1-cot(a)+cot(a)/1-tan(a)
prove = tan(a)+cot(a)+1

2007-01-14 18:35:30 · 6 answers · asked by Anonymous in Mathematics

I belive another planets(like The World) having among the starts.

2007-01-14 18:34:20 · 12 answers · asked by Rajendran 2 in Astronomy & Space