Science & Mathematics - 9 February 2007

Can Darkness be divided as in the case of light into seven colours? How and why darkness is associated with black?Blind People can appreciate light when focussed on the eyes. What is the effect of darkness on their eyes and brain? Did the great ' HELEN KELLER' throgh any light (?) on this ?

2007-02-09 15:53:42 · 7 answers · asked by Anonymous in Earth Sciences & Geology

2007-02-09 15:50:40 · 4 answers · asked by JW 2 in Chemistry

I'm specifically wondering about how groscopes are used to control or stabilize something.

2007-02-09 15:47:39 · 2 answers · asked by Anonymous in Physics

magnetocaloric effect,magnetism

2007-02-09 15:43:01 · 3 answers · asked by vivek d 1 in Engineering

Two cars A and B start side by side and accelerate from rest. The function representing the velocity of A looks like the square root of x starting from (0,0) and the function representing the velocity of B looks like the cube root of x starting from (0,0). At one minute, the graphs of the two functions intersect.

a. Which car is ahead after one minute?

b. What is the meaning of the area of the region enclosed by the two curves?

c. Which car is ahead after two minutes?

d. Estimate the time when the cars are again side by side.

2007-02-09 15:42:33 · 4 answers · asked by Anonymous in Mathematics

1. simplify
(6y^2+4y-3) + (3y^2+2)

2. simplify
(3x^2-5x+8) - (x^2 + 4x+1)

3. multiply and simplify
-3x^3(x^5-x)

4. Mulitply and simplify:
(x-2) (x-2)

5. Mulitply and simplify:
(x+1) (x^2 + 3x-4)


Thanks

2007-02-09 15:41:30 · 2 answers · asked by Anonymous in Mathematics

2007-02-09 15:41:08 · 10 answers · asked by nick317 1 in Mathematics

2007-02-09 15:40:16 · 5 answers · asked by Anonymous in Engineering

in our experiment, we get a 600mg commercial aspirin tablet and powdered it. Then we mix it with ethanol and let it evaporate in a water bath. After tha, we recrystallize it thru suction filtration...what is the use of ethanol in this experiment?

2007-02-09 15:39:03 · 3 answers · asked by john m 1 in Chemistry

a. dried lava
b. hydrogen and helium
c. crystallized ammonia
d. carbon dioxide

2007-02-09 15:37:42 · 6 answers · asked by Anonymous in Astronomy & Space

2007-02-09 15:36:49 · 14 answers · asked by alone 2 in Astronomy & Space

2007-02-09 15:36:32 · 9 answers · asked by ? 2 in Other - Science

(4x^2y)/(z^3) divided by 2xyz

2007-02-09 15:33:11 · 4 answers · asked by music man 2 in Mathematics

The question is .....A high school kicker makes a 30.0 yd. field goal attempt (in american football) and hits the crossbar at a height of 10.0 ft. What is the net displacement of the football from the time it leaves the ground until it hits the crossbar? I'm so confused......please help!

2007-02-09 15:33:09 · 5 answers · asked by shontai 3 in Physics

f(x) = x^2 + 2x - 3 if x is less than or equal to 1
ax + b if x is greater than 1

find a and b

2007-02-09 15:32:58 · 5 answers · asked by piccolo504 2 in Mathematics

2007-02-09 15:28:56 · 12 answers · asked by alone 2 in Astronomy & Space

2007-02-09 15:28:23 · 7 answers · asked by Anonymous in Chemistry

TRUE OR FALSE

2007-02-09 15:27:45 · 5 answers · asked by Anonymous in Chemistry

My system power requirement is between the range of 6.5V to 24V @ 0.8mA w/ GX1 200MHz, in my research I found a 4-cells of battery pack (each cell is 3.6V@ 1.8Ah and 500mA), can this be used for my system? How do I know this battery pack can last for how many hours? What is different between 1.8Ah and 500mA?

2007-02-09 15:23:46 · 2 answers · asked by Leong 1 in Engineering

Optoelectronic devices are those devices which change their refractive index with voltage

2007-02-09 15:23:10 · 2 answers · asked by SANKET J 1 in Engineering

TRUE OR FALSE?

2007-02-09 15:21:23 · 3 answers · asked by Anonymous in Chemistry

2007-02-09 15:21:07 · 10 answers · asked by alone 2 in Astronomy & Space

Sunlight is available only during day. Most of the energy requirements due to lighting needed at night, have led to serious and adverse activities related with construction of dams etc. Energy due to similar fission/fusion explosion, if allowed to take place on moon can provide earth with enough energy. This would be enough to take care of the energy requirements at night. With opto-powered devices, service economy can take the global intelligence to greater heights. Planting enough saplings wuold also cause reduction of carbon emission, as they would now be used to generate more oxygen. Emissions by plants at night would also decrease.

2007-02-09 15:20:27 · 4 answers · asked by doxa 2 in Astronomy & Space

TRUE OR FALSE?

2007-02-09 15:20:19 · 1 answers · asked by Anonymous in Chemistry

How can we tell what is hot, cold or just ok?
Does anyone have an experiment of the normal temperature that people can stand? Is it 37c?
Since i was little, ive always wondered if human can stand the low temperature better than the high temperature, that i always refused my mom when she wants me to get something out of Microwave..(or if i didnt refuse, i would take a lot of things to cover my hands)

So, tell me what you think..or if you're putting left hand in microwave and right hand in the fridge, tell me whats the result.

(Sorry for my complicated english and sorry for so many questions)

2007-02-09 15:20:14 · 4 answers · asked by Reen 1 in Other - Science

could someone help me with these problems?? ^ this means to the power of ..

Thanks



1. square root 200x ^2 y
100xy
20x square root y
100x square root 2y
10x square root 2y

2. simplify square root 72x^4 y^5

6x^2y^2 square root 2y
2x^2y^ square root 18y
34x^2y^2 square root y
6x^2y square root 2y^3

3. Multiply and simplify (4 square root 10x64y62) (2square root 10x62y^2)

8 square root 100x^6y^4
80 square root x^6y^4
80 x^3y^2
or already simplified.

2007-02-09 15:19:25 · 3 answers · asked by Anonymous in Mathematics

2007-02-09 15:18:43 · 3 answers · asked by Anonymous in Chemistry

2007-02-09 15:17:48 · 4 answers · asked by Lil M 1 in Biology

If a Z stat has a value z= -1.20 and alternative Hypothesis says that the population mean is greater than its value under the null hypothesis, the one sided P-value is? (Z= -1.20 -->.1151)

2007-02-09 15:17:30 · 2 answers · asked by washington_maverick 3 in Mathematics

Yes, I need to know.

2007-02-09 15:13:24 · 18 answers · asked by Hearts of Fire 1 in Astronomy & Space