Science & Mathematics - 23 December 2007

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can someone help me with calculus please?? thank u so much?

find all extrema in the interval [0,2π] if y = x + sin x

2007-12-23 04:06:40 · 2 answers · asked by Venia c 1 in Mathematics

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a box that is 5kg is accelerating at 6.0 m/ssquared with 5n fapp. what is force of friction?

2007-12-23 04:05:33 · 4 answers · asked by Anonymous in Physics

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Do you believe...?

That there is life besides that on Earth? Give reasons why you believe so, and if you do believe so, do you think they will ever visit us?

2007-12-23 04:00:50 · 8 answers · asked by I <3 the Joker 3 in Astronomy & Space

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Have you seen the most important phograph ever taken?

The Hubble Ultra Deep Field, the most important photograph ever taken, when they pointed the telescope at a dark spot in the sky and look back in time and found it was filled with more than we could have imagined.

http://www.youtube.com/watch?v=mcBV-cXVWFw

http://www.youtube.com/watch?v=e_1yQru3TdI

This is for people who haven't seen this image, because it is truely amazing and humbling and I believe it is important for people to see it.

2007-12-23 04:00:47 · 3 answers · asked by X 5 in Physics

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What is these elements?

A.Boiling point:-90 Celsius
B.445 Celsius
C.98 Celsius

The element list:
AgI
ICl
PH3

2007-12-23 04:00:18 · 3 answers · asked by Anonymous in Chemistry

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(x+2)^2=12?

(43) ??????????????????
I don't know where to start

Solve (x+2)^2=12

2007-12-23 03:59:45 · 8 answers · asked by cuvelx 3 in Mathematics

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Which one of the engineering is most interesting?

Sturctural?
Petroleum?
Electrical and Communications?
EloctroniC and communications?

2007-12-23 03:51:43 · 8 answers · asked by Anonymous in Engineering

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eventhough there are formulas for 2d objects,but i can not imagine if there is anything 2 dimensional.?

2007-12-23 03:50:09 · 4 answers · asked by Anonymous in Physics

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Is there a linear relationship between rotations going into a DC generator and voltage coming out?

I'm building a small vertical axis wind turbine for a school project. I wasn't getting the voltage I needed with wind from the fan I had, so I decreased the radius to increase the rotational velocity. When I halved the radius (and doubled the RPMs), the voltage more than quadrupled. Is this an accurate relationship? Or should the relationship be linear and some other factor accounts for the increase in voltage?

2007-12-23 03:49:40 · 2 answers · asked by emalynn.eleriel 1 in Engineering

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latest definition for "Sphere" and also relative probable theories please.thanks?

i have checked into wikipedia.org
http://en.wikipedia.org/wiki/Sphere

i believe that the definition of sphere in maths differs from
one the one in physics particularly in astrophysics.i need to know them both please.

2007-12-23 03:46:23 · 2 answers · asked by Anonymous in Physics

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the most recent definition for "Point" and probable related theories Please.thanks?

in maths and in physics.

2007-12-23 03:43:07 · 3 answers · asked by Anonymous in Physics

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What are the roots of the equation x^2-5x-2 = 0?

2007-12-23 03:43:06 · 4 answers · asked by D*Star 1 in Mathematics

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How an energy meter can be interfaced with RS232?

2007-12-23 03:40:35 · 2 answers · asked by aravind_arunram6 1 in Engineering

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Holy cow!! Have you seen this? How many galaxies, here?

Okay, some of you know I posted this link before, but for those who haven't you gotta see this. It's the Hubble image of M81. It's incredible. You can use the magnifier and scan around. It's like having zoom binoculars, or a microscope.

While exploring this photo, I have been amazed at how many galaxies are in it. I know this sounds dumb, but I'm going to try to count them. Any guesses? It'll take me a few days, I think. What I'd really like to do is make a small thumbnail of each one and put them all together in a huge montage. Anyway, go see it and take a guess. I'll be back in a few days.

2007-12-23 03:39:53 · 12 answers · asked by Brant 7 in Astronomy & Space

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what is the square root of (8x^3)/5?

2007-12-23 03:39:51 · 4 answers · asked by Anonymous in Mathematics

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what is the name of the rock that looks like ground pennies?

I got a pretty rock that looks like ground up pennies as a gift. Does anyone know what it's called? I've seen the stone used in jewelry...I just wish I knew what it's called. Thanks.

2007-12-23 03:37:22 · 6 answers · asked by AnnG 1 in Earth Sciences & Geology

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A space ship is going 3 million m/s away from you and fires a missile that goes 3 million m/s away from it.?

They both go in the same direction away from you. How fast is the missile going in relation to you?

2007-12-23 03:36:09 · 6 answers · asked by Anonymous in Physics

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Does anyone know how to build a catapult or a trebuchet?

In my history class, we just learned about them. I was wondering if anyone like actually knew how to build the big ones that they had in the renasaince. in school we get to shoot baseballs from them. =]

2007-12-23 03:34:03 · 3 answers · asked by Lilly F 1 in Engineering

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