Science & Mathematics - 12 October 2007

x+2y<=10
3x+y<=10
x>=0,y>=0

a.(10/3,0)
b.(2,4)
c.(0,5)
d.(10,0)

2007-10-12 06:10:35 · 3 answers · asked by B L 1 in Mathematics

2007-10-12 06:06:47 · 2 answers · asked by mike t 1 in Astronomy & Space

A steep cliff west of Lydia's home reflects a 995 kHz radio signal from a station that is 74 km due east of her home. If there is destructive interference, what is the minimum distance of the cliff from her home? Assume there is a 180° phase shift when the wave reflects from the cliff.
in m

2007-10-12 06:05:45 · 2 answers · asked by romaine_style 1 in Physics

The radio telescope at Arecibo, Puerto Rico, has a reflecting spherical bowl of 300 m diameter. Radio signals can be received and emitted at various frequencies with appropriate antennae at the focal point of the reflecting bowl. At a frequency of 200 MHz, what is the angle between two stars that can barely be resolved?
answer in mrad

2007-10-12 06:04:01 · 3 answers · asked by romaine_style 1 in Physics

Does heating copper sulfate produce a chemical or physical change? Why?

Also, does heating sucrose (table sugar) produce a chemical or physical change? Why?

2007-10-12 06:03:34 · 3 answers · asked by chemmyhead 1 in Chemistry

If there are very low amounts of wind in the tropics and near the equator, and with out wind you cant have rain ( on land at least ) then how do tropical rain forests recive so much rain ( over 100 inches of rain yearly ).

2007-10-12 06:02:29 · 2 answers · asked by Anonymous in Weather

Does the force of kinetic friction depend on the weight of the block? Does the coefficient of kinetic friction depend on the weight of the block?

2007-10-12 05:58:55 · 6 answers · asked by Natiphy2007 1 in Physics

2007-10-12 05:57:26 · 4 answers · asked by Anonymous in Engineering

For f(x) = -4x + 5 , find f(2)

I feel so stupid but these are hard because no one explained them for me. here are the multiple choice answers...
a. 6
b. -3
c. 13
d. -13

2007-10-12 05:53:29 · 8 answers · asked by mathdummythatneedshelp 1 in Mathematics

I need information on Solar Energy & Solar Panels!

2007-10-12 05:50:27 · 6 answers · asked by Anonymous in Astronomy & Space

2007-10-12 05:49:06 · 2 answers · asked by Mary C 1 in Physics

2007-10-12 05:47:39 · 4 answers · asked by abraymond5 1 in Mathematics

An indian tepee is a conical tent. Find the number of cubic feet of air in a tepee 10 ft. in diameter & 12 ft. high

2007-10-12 05:47:23 · 4 answers · asked by Jackie 4 in Mathematics

A 150 kg chunk of coal has a speed of 0.55 m/s when it leaves the chute. Determine the velocity of the car/coal system after the coal has come to rest in the car.

2007-10-12 05:46:14 · 1 answers · asked by Anonymous in Physics

I don't understand how that can be, because I know for Chinese people the dominant eye colour is dark brown, is it something with her genes? Is there a possibilty she is mixed?

She told me that out of her 6 siblings, she was the only one that got blue eyes and she told me her father had blue eyes too.

Plus, everyone made fun of her when she was younger because she looked like a mix of Chinese and Caucasian, people still thinks she's Caucasian nowadays.

I've asked her if she's mixed, but she doesn't know, I think it would help if I asked her dad (my great grandfather), but he's passed away for a long time now.

I'm mixed (half French, half Chinese) and I have light brown eyes.

I know you guys can't answer for me if she's mixed or not, but any ideas why she has blue eyes?

2007-10-12 05:46:12 · 9 answers · asked by Duchess of Cookieshire 6 in Biology

Calculate the percent ionization of nitrous acid in a solution that is 0.249 M in nitrous acid. The acid dissociation constant of nitrous acid is 4.5x 10to the negative 4?

2007-10-12 05:44:00 · 2 answers · asked by Anonymous in Chemistry

2007-10-12 05:42:46 · 10 answers · asked by collingbournekingston 4 in Mathematics

2007-10-12 05:38:04 · 7 answers · asked by Anonymous in Engineering

Question Details: well my math teacher assigned us a project and since we are in geometry she wants a model of my house...so wee need to convert them...my question is do we converth them to feet into cm??

2007-10-12 05:37:38 · 9 answers · asked by Anonymous in Mathematics

2007-10-12 05:37:30 · 8 answers · asked by Anonymous in Astronomy & Space

The bisector of the angle opposite the base of an isosceles triangle bisects the base and is perpendicular to the base.

2007-10-12 05:34:31 · 5 answers · asked by Ruth Naomi Mariae R 2 in Mathematics

If L is the dimension of length can you have sin(L) or is it just nonsense. If you can have it is the result dimensionless.

2007-10-12 05:31:34 · 7 answers · asked by eazylee369 4 in Mathematics

2007-10-12 05:29:20 · 3 answers · asked by suzukiracer6789 1 in Mathematics

2007-10-12 05:28:18 · 10 answers · asked by Anonymous in Mathematics

Which ones are primary pollutants and which ones are secondary....

Sulphur dioxide
Nitrogen Monoxide
Nitrogen Dioxide
Carbon monoxide
Carbon Dioxide
carbon (soot)

2007-10-12 05:26:17 · 1 answers · asked by Anonymous in Chemistry

2007-10-12 05:24:05 · 6 answers · asked by suzukiracer6789 1 in Mathematics

When you have a barbecue you burn the fuel to produce the heat needed to cook your food. When you have finished you have used up some fuel. But you have not used up the atoms in the fuel-the atoms are still somewhere. They have been conserved.

Q1)
If you used charcoal as the fuel,what happens to the atoms in the charcoal??

2) If you have used a gas barbecue, the fuel is natural gas (methane or butane) What happens to the atoms in a fuel?

3) Explain why, from the point of view of air quality,it is better to "get rid" of garden rubbish by composting rather than burning???

2007-10-12 05:23:22 · 4 answers · asked by Anonymous in Chemistry

What does it mean when a variabvle in a physics text is written in bold?

2007-10-12 05:22:56 · 4 answers · asked by RogerDodger 1 in Physics

2007-10-12 05:22:16 · 16 answers · asked by jdjackson74 1 in Mathematics

2007-10-12 05:22:13 · 4 answers · asked by Nap 1 in Mathematics