Science & Mathematics - 18 September 2006

Monochromatric light passes through a single slit,0.400 mm wide.It falls on a screen 1.6 m away.If the distance from the center of the pattern on the screen to the first band is 2.0 mm,what is the wavelength of the light?

2006-09-18 17:20:47 · 2 answers · asked by xxgodsgift2youxx 1 in Physics

"Black cloths heat up the body on a HOT day and cools down the body on a COLD day"

2006-09-18 17:20:05 · 13 answers · asked by Anonymous in Physics

I know that it could be used as medicine, but any others?

2006-09-18 17:16:18 · 4 answers · asked by ButterToast 2 in Botany

2006-09-18 17:15:54 · 5 answers · asked by Jill W 1 in Mathematics

Why does stirring a hot cup of coffee cool it down?

2006-09-18 17:13:26 · 7 answers · asked by Bill Billington 1 in Physics

fast fact on mars,uranus and pluto

2006-09-18 17:10:05 · 10 answers · asked by Anonymous in Astronomy & Space

decrease slightly, or stay the same? Explain your answer. Thanks.

2006-09-18 17:07:09 · 10 answers · asked by Bill Billington 1 in Physics

I don"t know how to use the AutoCAD 2007. Can you help me?

2006-09-18 17:07:06 · 6 answers · asked by Nur Asyraf 1 in Engineering

Here's a fun puzzle. You're going to go have dinner at your teacher's house. You know he has three kids, but you don't know anything else about them.

Once you get to his house, a boy answers the door. He says "my dad will be downstairs in just a second; you can wait in the kitchen." You wait as you're told, and soon your teacher comes downstairs. He hands you a beverage and says "my oldest child, my daughter Jane, should be home soon."

So, you've met one of his children, who happened to be a boy. You also know that the oldest of his three children is a girl. This means that he has one other child about which you know nothing. What is the probability that this other child is a girl?

(It's not 50%, if that's what you're wondering.)

2006-09-18 17:04:08 · 11 answers · asked by Anonymous in Mathematics

Question is asked to promote a healthy discussion on the different types of neutron moderators that have been used (i.e water, sodium, etc) including the pluses and minuses of these. Plus, I like beer.!

2006-09-18 17:01:01 · 3 answers · asked by NeutronDriver 1 in Physics

They say most men like blondes. Why is that?

2006-09-18 16:58:11 · 7 answers · asked by motherof2 2 in Chemistry

I know that a complementary angle is 90 and a Supplementary is 180 but in the following questions Im not sure how to apply that to get an answer.

Determine whether the statement is ALWAYS,SOMETIMES, or NEVER true.

1.) If two angles are complematary they are both acute angles.

Im not sure if it means both angles combined or separate to be acute.

2.) If lines PN and PQ are perpendicular then angle NPQ is acute

2006-09-18 16:53:24 · 6 answers · asked by MissLady0608 n 5 in Mathematics

2006-09-18 16:52:51 · 1 answers · asked by kristie 1 in Chemistry

the sum of 2 numbers is 5 more than twice the first. their sum 29 find the number

2006-09-18 16:52:48 · 11 answers · asked by antelias 2 in Mathematics

They must have some sort of air vents that take all the helium out of the air or something right??? Or do they make it? Is helium it's own element?

2006-09-18 16:49:55 · 5 answers · asked by Anonymous in Chemistry

is pluto a panet or a moon now

2006-09-18 16:35:46 · 25 answers · asked by sitrawoodglobal 2 in Astronomy & Space

I am really confused and it's starting to bug me. If anyone can answer me as soon as possible that would be great!

Thanx

2006-09-18 16:35:41 · 15 answers · asked by MinaJay 1 in Mathematics

find the components of the velocity of a car that is moving 60 km/h in a direction 70 degrees north of east.

2006-09-18 16:34:29 · 3 answers · asked by lorenzo p 1 in Physics

a rubber ball strikes a wall at a velocity of 55 km/h and rebounds with a velocity of -15 km/h. What is the change of velocity of the ball?

2006-09-18 16:32:28 · 4 answers · asked by lorenzo p 1 in Physics

i was given this question and for some reason no matter what i try to put in as the answer i get the answer wrong. This is very aggrivating since this question is extremely easy, and goes as follows (please explain your answer).

"In the following calculation


( ( (5.70 x 11.41) − 7.2356) ÷ 0.053 ) + 1

the number 1 is defined as exact.

Give the correct answer to this calculation with the correct number of significant figures. "

2006-09-18 16:29:54 · 9 answers · asked by Paul S 2 in Chemistry

Is it possible to use an electric motor to turn a generator to generate electricity, then in turn for the generator to supply a minute amount of the generated electricity to power the motor that turns the generator whilst still feeding the national grid with electricity.

2006-09-18 16:29:33 · 21 answers · asked by tunisianboy46 5 in Engineering

A pilot wants to fly a plane at 500 km/h directly north. the wind is blowing at 90 km/h from the east. Find the magnitude and direction of the course the pilot should fly.

2006-09-18 16:29:33 · 5 answers · asked by lorenzo p 1 in Physics

its a right triangle, and its very hard.

2006-09-18 16:23:20 · 12 answers · asked by Rachel 1 in Mathematics

2006-09-18 16:19:34 · 9 answers · asked by jordanb310 1 in Mathematics

My physics book, in the section on conservation of energy, says that energy cannot be created or destroyed. The book doesn't provide much of an example except for dropping a pen to the floor. The pen and the floor have a slight rise in temperature. If energy cannot be created or destroyed, it sounds to me like it has no beginning or end. So, if you didn't create the energy when you picked up and dropped the pen, where did it come from? After you drop the pen to the floor, there is a slight rise in the temperature of them both. Is this heat the energy? If so, where does it go when the heat is gone? I'm confused. This is my first class on physics.

2006-09-18 16:19:16 · 9 answers · asked by Anonymous in Physics

2006-09-18 16:16:58 · 11 answers · asked by MARY I 1 in Mathematics

1200s
1600s
1800s
1900s

I have already tried to Google and Yahoo! it. They give me different dates and im not sure which is correct

2006-09-18 16:14:59 · 4 answers · asked by Anonymous in Mathematics

2006-09-18 16:10:14 · 3 answers · asked by Anonymous in Earth Sciences & Geology

Earth's many species including mankind form an intricate web of life. However many scientists fear that some species are vanishing at an alarming rate, should you be concerned?

2006-09-18 16:07:22 · 4 answers · asked by claudia91701 3 in Earth Sciences & Geology

Is Washington DC a state or a providence..or a city in another state?We have been going at it for awhile.Corect answer gets 10 points.

2006-09-18 16:05:59 · 18 answers · asked by **BLu Tinkerbell** 4 in Geography