If you could provide for the body's needs and a staircase was built,
is it possible to walk to the spacestation?

Please provide the "why".

Thank you

The first problem I see with this is that the International Space
Station is not in geostationary orbit. It doesn't stay in the same
place, relative to the earth.

Yeah its moving at like... a couple thousand miles an hour. Hope you
can jump on quick. lol

You might have better luck with geosychronus orbit which is an orbit
that stays over the same spot on the earth.  In that case, you would
have to walk 23,000 miles or almost 37,000 kilometers!  And that would
be straight up a ladder!  Stairs would probably be 2 or 3 times as
long as that.  You might get a little tired.  If you could climb 100
miles a day it would take about 700 days to climb.(23,000 /100 * 3 =
690) (I would consider driving)

There is a science fiction book by Arthur C. Clark called "The
Fountains of Paradise".  It is about building an elevator to a spot in
geosychronus orbit.  Currently, we do not have materials strong enough
to do that, but maybe some day.  It is a fasicnating novel and very
ahead of its time since it was published in 1953.

The Space Elevator Comes Closer to Reality:
http://www.space.com/businesstechnology/technology/space_elevator_020327-1.html

Let's try an order of magnitude approximation.

In order to answer this question we need to know the altitude of the
International Space Station and the speed at which a person can climb.

The International Space Station (ISS) follows an elliptical orbit
around the Earth so sometimes it's altitude is lesser, and sometimes
it is greater.  On average, the ISS is 372 kilometers (231 miles)
above the surface of the earth.  (for comparison, the moon is an
average 384,403 km above the earth.)
Were this a horizontal distance on the surface of the Earth, a person
could easily walk this distance withen a few days.  Vertically this is
about the height of 976 1/2 empire state buildings or 99590 of its
stories.

It certainly not impossible for a person to climb the empire state
building 977 times.

Assuming that we have an athletic person that can climb this height
with no adverse health effects and assuming that this persion can
climn at a rate of 2 stories per minute (a very slow, easy pace) of
height it would take this person 49795 minutes to climb to the ISS. 
If this person stopped for rest, food, etc. for 10 minutes at every 50
minutes of climb, and out athelete slept 8 hours per day, this would
give our climber 800 minutes of climbing time per day.

At this rate It would take a mere 62 1/4 days to climb this height.

However it is important to realize the the force of gravity becomes
weaker as the person climbs.

On Earth, the Acceleration due to Gravity is about 9.80 meters per
second per second.  On the Space Station, the acceleration due to
Gravity is about 8.68 meters per second per second.  The reason the
astronauts in the ISS don't notice the gravity is because they are in
free fall.  (please indicate if further explination is needed.)

Thus, as the force of gravity becomes weaker, it becomes easier for
the person to climb.  And the person would need less rest.

Also, as the person climbs, his radial acceleration towards the earth
increases, thus, he feels less force as he climbs.

If this stair case is attached to the space station (and not the
earth) then the free fall effect increases until, at the point he
reaches the space station, he does not notice gravity at all.

Thus, my rough estimation 62 1/4 days is definately an overestimate.

It is important to note that, as mentioned, the Space Station is not
in Geostationary orbit, that is, it doesn't remain or hover over the
same spot of the earth at all times.  Also, the orbit of the ISS is
not circular, it is ellipictical.

As such, the staircase itself, if attached to the ISS, would have to
be free floating on Earth, not attached to any point, else it would be
wrapped around the earth or broken apart by the torsion forces of the
ISS and Earth not moving at the same rate.  Also, the Staircase would
have to either be the minimum distance of seperation between the earth
and ISS and be lifted off the earth, or it would have to be able to
stretch and compress as the distance between the Earth and ISS
changes.

More about the space elevator:

YAHOO NEWS
http://news.yahoo.com/news?tmpl=story&cid=624&u=/ap/20040625/ap_on_sc/space_elevator_3&printer=1

tutuzdad-ga

Well, I will try to give the answer as the problem is represented:
1. Is it possible...? YES
2. Why? Because the problem dosn't suppose any constrains. I say that
in the question there is not a single thing which could stop
you,besides what you can imagine trying to solve the problem
practicaly. The problem suppose already a staircase; in real world
such a staircase couldn't be built (at least ATM), so this constrain
is eliminated. What constrain can we imagine?
a) Given the height of the staircase and how much you can climb during
a day (subtracting time for eating and sleeping) it could take longer
than a human life (but we suppose the spacestation is not that far).
b) At a given altitude the atmosphere cannot provide life support
anymore (too cold, too depressurised)or even you quit the atmosphere
so we imagine that we have a spacesuit with enough air tubes and
heating energy. But again, this is constrain is not mentioned in the
problem, not even suggested.
c) If the spacestation is stationary than the staicase should end or
pass close to it. If not, then the spacestation orbit should intersect
the staircase regularly or at an instant after you reached the
sufficient altitude and at that moment you should jump very
synchronously :).

And probably there are more real word constrains, but when you
mentioned the staircase in fact you gave freedom to imagine anything
to bypass a real world situation.

So, as time as you eliminate anything could stop you climbing the
staircase, you will reach the spacestation sooner or later.
There is a big difference between "theoreticaly" and "practicaly".
Theoreticaly the answer is YES, and the way you put the question
"attracts" a theoretical approach. Practicaly, ofcourse the answear is
NO. So you must be very careful with how you ask the question in order
to get the answer you "expect".
Einstein said:" If I would be in a life and death situation and only 1
hour given, I would spend 55 minutes to find the right question and
only 5 minutes to answer it".

Please excuse my english, I am not a native english speaker.