Science & Mathematics - 26 October 2007

At a playground, a 18.0 kg child plays on a slide that drops through a height of 2.21 m. The child starts at rest at the top of the slide. On the way down, the slide does a nonconservative work of -312 J on the child. What is the child's speed at the bottom of the slide?

2.A particle moves under the influence of a conservative force. At point A the particle has a kinetic energy of 14 J; at point B the particle is momentarily at rest, and the potential energy of the system is 24 J; at point C the potential energy of the system is 6 J.
(a) What is the potential energy of the system when the particle is at point A?
J
(b) What is the kinetic energy of the particle at point C?

2007-10-26 05:14:11 · 1 answers · asked by Anonymous in Physics

And maybe the more important question is Why does Answers allow them to hide them.
It seems to me if a person is asking honest questions and giving honest, helpful answers they would not want to hide them. I get a lot of useful information looking back at someones answers when I see that they give some good advice on a question. When I see Q&A's hidden, I start to doubting anything they say. Yahoo Answers allowing people to hide their Q&A's seems to go against everything that they stand for, which is to provide people with a forum to get good honest helpful answers. I realize that there are some people on here for other reasons. Providing a hiding place for them seems to encourage these people. If I am missing the point here, someone clue me in.
I am asking this in Agriculture because these are my people and the one's I'm interested in hearing from.

2007-10-26 05:12:20 · 10 answers · asked by john h 7 in Agriculture

How do you convert a percentage to fraction notation?

2007-10-26 05:12:09 · 14 answers · asked by babysteaks3 2 in Mathematics

2007-10-26 05:10:13 · 5 answers · asked by Anonymous in Mathematics

2007-10-26 05:09:58 · 7 answers · asked by Hannah D 1 in Mathematics

For science I have to make a earthquake resistant model. That can actully survive a simulated earthquake by shaking the desks in Transfrom, Divergent and, Convergent. It can be anything that not too heavy and it can be up to 2 ft. Also it needs to be simple enough for 6th grade but still needs to be good. I just need suggestions I dont want to cheat.

2007-10-26 05:09:22 · 2 answers · asked by Anonymous in Earth Sciences & Geology

itt iss a math questionn i can'tt gett itt please helpp!!!!!PLEASEEE!!!

2007-10-26 05:04:22 · 8 answers · asked by Anonymous in Mathematics

2007-10-26 05:03:37 · 22 answers · asked by shanichikudo 1 in Astronomy & Space

here's the question, it sounds like physics, but i'm in diff. eq and i don't have a clue how to start it...(we are currently working on nonhomogeneous diff eqs)

A front-loading washing machine is mounted on a thick rubber pad that acts like a spring; the weight W = mg (with g = 9.8 m/s2) of the machine depresses the pad exactly 0.13 cm. When its rotor spins at ω radians per second, the rotor exerts a vertical force
F0 cos(ωt)
Newtons on the machine. Neglecting friction, determine at what speed (in revolutions per minute) resonance vibrations will occur?
thanks!!

2007-10-26 05:02:34 · 1 answers · asked by laffytaffy06 1 in Mathematics

How do I find the numbers?
I am having a hard time trying to figure these out.
Please show me the steps to do this!!

2007-10-26 04:57:51 · 11 answers · asked by max 1 in Mathematics

2007-10-26 04:56:32 · 7 answers · asked by Anonymous in Mathematics

1.) In terms of chromosome number, how do an egg cell and a sperm cell differ from a seed?

2.) What is the adaptive advantage of a plant that produces seeds with "wings"?

I can't find it on wikipedia, my textbook or on google...maybe I'm searching for the wrong thing, but I really don't get it.

2007-10-26 04:55:27 · 4 answers · asked by BrixxVida 2 in Botany

2007-10-26 04:53:09 · 2 answers · asked by bharat r 1 in Geography

A regular hexagon has sides of length 12 cm. If the length of the apothem is 6�ã 3 cm, what is the area of the polygon?

2007-10-26 04:48:17 · 2 answers · asked by Anonymous in Mathematics

Occasionally when I take a shower- the liner blows around "attacking" me. Why?? The door is always closed and the windo is not open. And it doesn't occur all the time.

I would like to stop it if I can- cause how irritating is it to try and take a shower while having plastic suctioning to your wet body!

2007-10-26 04:47:30 · 7 answers · asked by missgabbieh 2 in Other - Science

If a point on the wheelhas a centripetal acceleration of 1.2 m/s^2, what is the point's tangential speed?

2007-10-26 04:46:20 · 2 answers · asked by Pascal 4 in Physics

2007-10-26 04:45:54 · 8 answers · asked by ? 6 in Botany

2007-10-26 04:44:16 · 6 answers · asked by Anonymous in Other - Science

I saw it behind the pool table. It was solid black about 3 feet tall and it moved almost too fast to see but it darted into the corner and then it was gone.
I know it was not an animal but what could it be. I am scared to go in there now

2007-10-26 04:41:50 · 14 answers · asked by Miley 2 in Paranormal Phenomena

If we are going around a corner in a fast car, we feel like we are being thrown outward, we call it outward centrifigal force. But in terms of Newton's laws this false force doesn't exist. Can you explain why?

Hint. start with Newton's first law.

2007-10-26 04:39:28 · 6 answers · asked by Pascal 4 in Physics

My mom said something like it determins how long the winter will be, like they do when a groundhog sees his shadow in the spring. She was talking about the wolly bears stripes are sometimes longer in one color than the next stripes color.

2007-10-26 04:39:17 · 1 answers · asked by ambr1981 1 in Zoology

yes or no then explain. what compounds does the element form? how much energy does it take to form the compound?

2007-10-26 04:38:16 · 3 answers · asked by kunga92 1 in Earth Sciences & Geology

2007-10-26 04:37:00 · 2 answers · asked by heaven87 1 in Biology

what is its average angular speed in rad/s?
if two people were on it one at 4.0 m and one at 5.0 m from the center, what would there their tangential speeds?

2007-10-26 04:36:15 · 2 answers · asked by Pascal 4 in Physics

2007-10-26 04:29:54 · 4 answers · asked by Pascal 4 in Mathematics

2007-10-26 04:29:51 · 7 answers · asked by Didy 4 in Earth Sciences & Geology

i have family there and haven't seen if it was or not. i know san diego was hit hard and le mesa is near there, so does anyone know?

2007-10-26 04:23:31 · 2 answers · asked by Anonymous in Weather

2007-10-26 04:22:01 · 10 answers · asked by josh.isaiah 2 in Mathematics

If the entire world as on fire, could humans/animals survive underwater, say in a submarine?

2007-10-26 04:20:50 · 18 answers · asked by Anonymous in Earth Sciences & Geology

I can only thing of 5....

2007-10-26 04:20:38 · 5 answers · asked by Kym 2 in Weather