Science & Mathematics - 14 November 2006

Triangle ABC is an isosceles triangle with the measure of angle B = the measure of angle C, and the measure of angle A = 20 degrees. Points D and E are located on sides AC and AB, respectively, so the the measure of angle CBD = 50 degrees and the measure of angle BCE = 40 degrees. Determine the measure of the angle BDE.

2006-11-14 14:24:06 · 3 answers · asked by David L 1 in Mathematics

1. Name the flight controls and parts of an airplane.
(I would appreciate a diagram with labels too.:)
2. How does an pilot control/turn a plane?
3. List some features or adaptations that allow birds to fly.
4. How does a hot air balloon fly?

2006-11-14 14:23:25 · 3 answers · asked by unknown girl 2 in Astronomy & Space

A person lifts a 4.8 kg cement block a vertical distance of 1.4 m and then carries the block horizontally a distance of 7.1 m.

The acceleration of gravity is approximately 9.81 m/s^2
Determine the work done by the person in the proscess. Answer must be in units of joules.

i know how to find the work done by each seperately but when i added the two, the site said my answer was wrong.

can someone explain to me how go about solving this?

2006-11-14 14:22:06 · 2 answers · asked by wish1oh1 1 in Physics

The solubility of calcium arsenate (Ca3(AsO4)2, molar mass = 398.078 g) in water is measured to be 0.034 g/L. What is Ksp for this salt?

2006-11-14 14:20:27 · 1 answers · asked by Anonymous in Chemistry

2006-11-14 14:17:30 · 2 answers · asked by TayTay 2 in Zoology

2006-11-14 14:17:18 · 1 answers · asked by cynthia c 1 in Earth Sciences & Geology

I do not understand chemistry and I want to know the difference in lone pairs and bonds and how each repel other atoms. Such as if water's two lone pairs were changed into bonds, what would the geometric shape be?
Placing atoms in places also confuses me, like does it matter where the Cl atoms are put in the dichloromethane (CH2Cl2) in the geometric or lewis structure (if the Cl's could be opposite or adjacent to each other). And since it is already filling it's all 8 electron shells, is the CH2Cl2 already non-polar? Or is it still polar?

2006-11-14 14:15:00 · 3 answers · asked by Anonymous in Chemistry

2006-11-14 14:14:51 · 6 answers · asked by Anonymous in Astronomy & Space

2006-11-14 14:14:08 · 3 answers · asked by smcgraw_ca 1 in Zoology

2006-11-14 14:13:29 · 4 answers · asked by Anonymous in Astronomy & Space

hi
i need some information for my essay on photgraphic equipment purchase before friday november 17, 2006 please. thank you

2006-11-14 14:13:02 · 1 answers · asked by Anonymous in Engineering

A baseball (m = 149 g) approaches a bat horizontally at a speed of 43.7 m/s (98 mi/h) and is hit straight back at a speed of 48.3 m/s (108 mi/h). If the ball is in contact with the bat for a time of 1.10 ms, what is the average force exerted on the ball by the bat? Neglect the weight of the ball, since it is so much less than the force of the bat. Choose the direction of the incoming ball as the positive direction.

I've used (Sum of forces)(time)=(mass x Vf) - (mass x Vo)
doesn't seem to be working, and time is in miliseconds. any help?

2006-11-14 14:11:52 · 1 answers · asked by Any help? 1 in Physics

There are 6 people in a room. If everybody shakes hands once with each person, how many handshakes will there be?

2006-11-14 14:10:20 · 3 answers · asked by Anonymous in Mathematics

Please help!!! Tahnks

2006-11-14 14:08:55 · 6 answers · asked by alanababy556 1 in Mathematics

2006-11-14 14:08:50 · 6 answers · asked by Day 1 in Geography

2006-11-14 14:08:09 · 3 answers · asked by cynthia c 1 in Earth Sciences & Geology

Can some one send me a link to a proof or do it themselfs for why the sumation as n approaches infinity of the equation 1/n^2 is eqaul to Pi^2/6

Thanx

2006-11-14 14:07:20 · 2 answers · asked by The Dude 3 in Mathematics

thanks

2006-11-14 14:05:45 · 3 answers · asked by Michelle 4 in Chemistry

2006-11-14 14:05:20 · 2 answers · asked by encs 1 in Mathematics

it is an living envirment question.

2006-11-14 14:03:24 · 9 answers · asked by ail 1 in Biology

if monkeys evoluted into people, then why are there still monkeys? that's what i don't get.

2006-11-14 14:03:21 · 21 answers · asked by Anonymous in Biology

2006-11-14 14:01:11 · 1 answers · asked by wmm_stealth 1 in Physics

2006-11-14 14:00:19 · 9 answers · asked by *Cherry* 2 in Mathematics

2^x + 2^-x = 5/4 ... what is x?

Thanks...

2006-11-14 13:58:47 · 2 answers · asked by Ms. Curiosity 1 in Mathematics

How fast would a bullet weighing .005 Kg needs to be traveling to bring a 20,000 Kg tractor trailer moving at 24 m/s to rest? (assume the bullet sticks to the truck) Could this be possible if the maximum speed possible is 3 x 10^8 m/s?

2006-11-14 13:58:10 · 4 answers · asked by mike p 2 in Physics

i missed a day of class, my teacher is making me take a test tomorrow and wouldn't give me extra help today. please help me with asymtopes of rational functions. i know how to do it but end up with the incorrect answer. and help with factoring... i'm almost ashamed to say that i'm dependent on my calculator when it comes to factoring. any help you can give would be great

2006-11-14 13:57:47 · 4 answers · asked by xdragonfly610x 1 in Mathematics

Hi, I had a lab today where we find constant using Titration curve, im not sure how to do that last part.

My average of volumes, for pH 7 = 6.97. I think I devide this by 2 to get the half equivalence point, which would be 3.49mL at that my pOH was 4.51,

I was titrating 10mL of unknown acid with .1000M NaOH

the equation I use is pOH = pKb + log [conjugate acid]/[base]

Im not quite sure what to do from there, I dont know how to get the conjugate acid, and what is the base .1000 because thats what its molarity is? Do I plug 4.51 into the pOH and then devide log conju acid/base by 4.51 to get pKb, is pKb the dissociation constant?

Any help or infomation would be appreciated.

2006-11-14 13:56:58 · 1 answers · asked by axcryingxshame 1 in Chemistry

2006-11-14 13:55:17 · 7 answers · asked by John B 2 in Physics

How do we know we're not upside down?

2006-11-14 13:54:25 · 9 answers · asked by Anonymous in Earth Sciences & Geology

2006-11-14 13:52:51 · 3 answers · asked by sarah 1 in Zoology