Science & Mathematics - 16 September 2007

Two basketball players are essentially equal in all respects. (They are the same height, they jump with the same initial velocity, etc.) In particular, by jumping they can raise their centers of mass the same vertical distance, H (called their "vertical leap").
The first player, Arabella, wishes to shoot over the second player, Boris, and for this she needs to be as high above Boris as possible. Arabella jumps at time t=0 , and Boris jumps later, at time tR (his reaction time). Assume that Arabella has not yet reached her maximum height when Boris jumps.

1) Find the vertical displacement D(t)= hA(t) - hB(t) , as a function of time for the interval 0Express the vertical displacement in terms of H , g , t and .
D(t) = ?
2)Find the vertical displacement D(t) between the raised hands of the two players for the time period after Boris has jumped (t>tR) but before Arabella has landed.
Express your answer in terms of t, tR , g , and H.
D(t)=?

2007-09-16 10:57:22 · 1 answers · asked by mandy 1 in Physics

Would you travel around space?How would you feel about that?

2007-09-16 10:55:57 · 8 answers · asked by Life goes on... 6 in Astronomy & Space

A small source of light S is located at a distance L from a vertical wall. An opaque object with a height of h moves toward the wall with constant velocity of magnitude v. At time t=0, the object is located at the source S.

2007-09-16 10:51:28 · 1 answers · asked by mandy 1 in Physics

2007-09-16 10:47:03 · 5 answers · asked by Tridon 1 in Chemistry

hi all
5am early moring recent days bright star 15 degrees above eastern horizon could it be venus or another planet/star

Please help
xox

2007-09-16 10:46:58 · 2 answers · asked by ♥Paws 4 thawts♥ 4 in Astronomy & Space

I cannot find out what his middle name is. I reawlly need it for a project. Help???

2007-09-16 10:44:13 · 7 answers · asked by Anonymous in Astronomy & Space

I'm doing a map from my house to school.And according to google maps,I live 1.8 miles away.My teacher wants us to do a scale per inch. So I measured how far I live from the school and I got 14 1/2 inches. Should I divide 1.8 by 14 1/2...? or what?Please help.

2007-09-16 10:41:49 · 8 answers · asked by Anonymous in Mathematics

Are there do you think sounds like explosions...what are some space noices?

2007-09-16 10:40:56 · 18 answers · asked by Life goes on... 6 in Astronomy & Space

Tue or False?

200 Billion = 200 Thousand Million?

2007-09-16 10:39:13 · 12 answers · asked by kevin 2 in Mathematics

The asthenopshere makes no sense. How can the earth go from solid (inner core), to liquid (Outer Core), Then Solid (Mantle), Then Liquid (Asthenosphere), back to solid (Crust)?

How is the mantle solid and the asthenosphere liquid? How do the plates move?

I AM SO CONFUSED!

Keep the answers simple people

2007-09-16 10:35:36 · 2 answers · asked by Tim Buck 5 in Earth Sciences & Geology

For the human species to outlive our Sun me must Colonise other planets! Even at the speed of light Space Travel can be emencely long! What do you think?

2007-09-16 10:34:32 · 26 answers · asked by Anonymous in Astronomy & Space

A car with a velocity of 25m/s [E] changes it's velocity to 25m/s [S] in 15sec. Calculate the car's average acceleration.
um, i just want to know do i have to change one of 25m/s to minus sign?? and the answer for this question is 2.4m/s^2 [45 degerees S of W] thx :)

2007-09-16 10:34:14 · 1 answers · asked by Anonymous in Physics

2007-09-16 10:33:30 · 11 answers · asked by Anonymous in Mathematics

i have a health project and we need to "create" our own Over The Counter drug...i was given analgesic (pain relivers) and i need a really cool name for my "product"....any ideas?

2007-09-16 10:32:42 · 4 answers · asked by devin m 2 in Medicine

2007-09-16 10:31:44 · 4 answers · asked by Romeo Jr L 2 in Weather

I know ur suppose to do it by PEMDAS order.
And I got 77.Is that correct?
RETARDED stuff.

2007-09-16 10:29:45 · 10 answers · asked by Anonymous in Mathematics

2007-09-16 10:25:43 · 4 answers · asked by Anonymous in Medicine

2007-09-16 10:23:01 · 1 answers · asked by Average Joes 4 in Chemistry

2007-09-16 10:21:43 · 8 answers · asked by luis s 1 in Engineering

(a) 0.1 M HONH2 (Kb = 1.1 * 10-8)
(b) A mixture containing 0.1 M HONH2 and 0.1 M HONH3Cl

Please can you explain each step. I would be greatly appreciated

2007-09-16 10:20:15 · 1 answers · asked by uberifrit 2 in Chemistry

does anyone know the proper step to take to open a zoo because my lifelong dream has been to own a zoo and i love lions so my dream was to at least own a lion and a monkey but i would just like to know how would someone go about starting a zoo how do you get all the permits and the right land and how do you know where to get the land and how much money do you think it would take. i know ill probably never have enough money so dont start telling me how its a lost cause because i know it probably is unless i could somehow raise millions of dollars by making a fake charity or something (before you start telling me how wrong that is im not planning on opening a fake charity)

2007-09-16 10:19:17 · 4 answers · asked by crystal h 2 in Zoology

please provide a written proof, like with words explaining how this is true... not a numerical proof. thanks!

2007-09-16 10:18:03 · 5 answers · asked by paulinatran10 1 in Mathematics

whicch is more denser, hot or cold water...why?

2007-09-16 10:17:39 · 3 answers · asked by BIOBOY 1 in Chemistry

(C subscript 6 H subscript 12 O subscrip 6).

2007-09-16 10:15:24 · 2 answers · asked by Anonymous in Chemistry

2007-09-16 10:14:50 · 3 answers · asked by M.K 2 in Astronomy & Space

finding surface area where curve x={2y-1}

I've done a CD for 1/(8y-4) and then a u substitution for {2y-1} to cancel a term, but that still leaves me with an y term in my new integral.

I know writing the whole answer out on a computer is tedious, so any suggestions on how to go about solving this would really be appreciated.

2007-09-16 10:12:34 · 4 answers · asked by Jaron 2 in Mathematics

2007-09-16 10:12:14 · 9 answers · asked by Anonymous in Engineering

why are we spending time and money looking for life on mars, an obviously barren and lifeless planet. why dont we take a few years to develope a new, faster space probe that could make it to Gliese 581 c. sure it would take a long time, bt thats the best chance for life, titan and europa are decent chances, but cmon. if not now then when, if we want to find life outside of earth then we need to persue realistic planets, no matter how far away they may be.

2007-09-16 10:09:57 · 11 answers · asked by Anonymous in Astronomy & Space

Is it possible to simplify further √125 / 125?

Sorry, I know this is a easy question but this is after my first lesson of AS maths for a whole year so I'm a bit clueless :(

2007-09-16 10:08:41 · 3 answers · asked by Mark 2 in Mathematics

Im so stuck! I can't simplify these quadratic expressions: -

1) x^2 + x - 6 / x^2 - x - 2

2) x^2 + x - 2 / x^2 + 4x + 3

How do i do it!! Help!!

2007-09-16 10:08:01 · 8 answers · asked by Zukky 2 in Mathematics