Astronomy & Space - November 2007

Calculate how much work is required to launch a spacecraft of mass m from the surface of the earth (mass me , radius Re) and place it in a circular low earth orbit, that is, an orbit whose altitude above the earth's surface is much less than Re . (As an example, the International Space Station is in low earth orbit at an altitude of about 400 km, much less than Re=6380 km .) You can ignore the kinetic energy that the spacecraft has on the ground due to the earth's rotation.
Express your answer in terms of the variables m,me, Re and appropriate constants.

B)Calculate the minimum amount of additional work required to move the spacecraft from low earth orbit to a very great distance from the earth. You can ignore the gravitational effects of the sun, the moon, and the other planets.
Express your answer in terms of the variables m,me ,Re , and appropriate constants.

2007-11-26 03:48:31 · 2 answers · asked by lildrak2002 1

2007-11-26 03:36:08 · 3 answers · asked by Anonymous

Like in a circle ......lol

2007-11-26 03:31:01 · 10 answers · asked by janjaley 2

2007-11-26 02:38:54 · 12 answers · asked by foxfoxcar 1

can somebody calculate the Star Time of the following times and years- i want to make star charts for my sister and i and my book is outdated...... please! or at least direct me to a website that can help

1. november 8, 22:01, 1992

2. november 13, 11:58, 1991

2007-11-26 02:01:33 · 5 answers · asked by JustATeen 1

2007-11-26 01:51:08 · 18 answers · asked by Tracy Terry 2

She´ll be turning 10 soon and is interested in stars etc. I´d like her to be able to see things with some detail (eg. the comet which has recently exploded, Jupiter etc) but don´t want it to be too large or complicated. Also, there are 2 younger brothers ......
Any suggestions?

2007-11-26 01:43:57 · 7 answers · asked by jenny 4

2007-11-26 01:37:13 · 12 answers · asked by Tracy Terry 2

I'd like to find a reasonably priced telescope for my husband.
I want to wow him with a new toy, basicly . He needs something that offers the most celestial viewability and I have no idea (other than a reflector type) on what to get a beginner.
Which brands have more bang for the buck and which should I avoid?

2007-11-26 01:25:08 · 6 answers · asked by atomictulip 5

2007-11-26 00:39:16 · 11 answers · asked by seanjoemac 1

2007-11-26 00:36:47 · 4 answers · asked by kava 01 1

please answer my question as soon as possible..
thank you!

2007-11-25 22:22:39 · 5 answers · asked by jinjang 1

throw in everything you know about JOHANNES KEPLER. focus more on what he did. Thanks.

2007-11-25 21:39:32 · 5 answers · asked by Dollarside 3

2007-11-25 21:25:57 · 8 answers · asked by Anonymous

2007-11-25 21:05:34 · 18 answers · asked by Goldfish" 1

IS IT POSSIBLE TO HAVE AN ELEVATOR THAT CAN REACH FROM A GROUND BASED ELEVATOR TO OUTER SPACE ? DO YOU THINK IT WILL BE A REALITY ONE DAY?

http://www.cnn.com/2006/TECH/space/09/18/space.elevator/index.html

2007-11-25 20:47:54 · 8 answers · asked by SPACEGUY 7

2007-11-25 20:33:40 · 1 answers · asked by Anonymous

2007-11-25 20:02:26 · 2 answers · asked by Mercury 2010 7

Are there any possibilities that thousands of years from now, human may leave the earth and thrive in "another earth", a place better than earth, for any good reasons.

2007-11-25 19:52:38 · 22 answers · asked by Boknoy 3

will we be traveling to other planets to live there? i think it would be pretty interesting to see this, but would like to know other peoples opinions. thanks

2007-11-25 18:26:44 · 7 answers · asked by Anonymous

2007-11-25 17:49:46 · 5 answers · asked by marcjiles1 1

I have a software that can read NASA JPL DE406 ephemerides files, but the program returns the coordinates of any given planet in x,y & z. Can someone please tell me how to convert them to zodiac coordinates, e.g; Libra 03 45' 53"? Many thanks!

2007-11-25 17:30:21 · 3 answers · asked by cjdrox 2

I am a novice astrologist and I want to know if and how can you calculate the exact point on which falls the eastren horizon on the zodiac. Also, I have obtained a software piece which reads NASA JPL DE406 files and gives me the astronomical coordinates(x,y & z) of any planet. Many thanks to anyone who can explain to me how to convert them to zodiac coordinates. e.g.: Libra 03 45' 53"

2007-11-25 17:26:51 · 2 answers · asked by cjdrox 2

I'm only wanting a smaller one for my own personal use. I cant spend very much on it, probably not more than 100 bucks. I know that one is better than the other in the sense that if your one person that is going to use it, and only for your personal use, than one would be better. I would like to see the solar system-stars-planets....ect..

2007-11-25 16:32:09 · 7 answers · asked by kimberleyislove 1

By what different methods (there are at least 2) do we infer that globular clusters are the oldest things in our galaxy? How do we infer that objects in the spiral arms are the youngest members of the galaxy?

2007-11-25 16:10:19 · 3 answers · asked by Anonymous

2007-11-25 15:53:23 · 8 answers · asked by Michael P Marshall 1

Does anyone know where I could find flash cards for the 88 constellations?

2007-11-25 15:40:53 · 6 answers · asked by Richard M 2

Small rockets are used to make small adjustments in the speed of satellites. One such rocket has a thrust of 55N. if it is fired to change the velocity of a 85000 kg space craft by 93 cm/s, how long should it be fired? answer in seconds.

make sure cm is converted to m/s

2007-11-25 14:10:38 · 2 answers · asked by XzoeyX 2

I really like this girl soo much and maybe this would be the last birthday gift i will give to her,because im gonna gradute in highschool next year and maybe im not gonna see her again.Please help me.

2007-11-25 14:10:34 · 15 answers · asked by ChrisCT 4

please help me. where and how do i get them.. this is my third time asking without anyone answering so pls help

2007-11-25 13:53:49 · 3 answers · asked by avatat070 2