Books recommendation needed

Sam:
     Sorry about confusing you with Roger (who hadn't seen nor read THE PRINCESS BRIDE.)

Roger:
     Get the book or disc. Goldman, the writer, did both.

Ted:
     What was Inigo's FULL name (clarified in his final fight)?   :)    (bet ya gotta check the disc, huh?)

ALL:
     The movie's classed as a 'comedy', but, I thought it was really more of a beautiful 'fairy tale,' though with comedic elements. The music (especially the ending-credits song) was NOT 'comedic.'

LLAP
J:D

Post 21

Monday, July 16, 2007 - 6:49pm

     Sorry about re-hijacking the thread.

     Back to 'books recommendations' we go.

     How about...um-m-m...oh-h-h...

THE PRINCESS BRIDE by William Goldman?

LLAP
J:D

Post 22

Monday, July 16, 2007 - 7:22pm

Inigo Francisco Domingo Carlos Andres Sebastian D'Anconia y Montoya?

I actually only saw the movie for the first time a year ago, and haven't memorized it yet.

Ted

Post 23

Monday, July 16, 2007 - 7:26pm

Ted:

Eh-h-h, yer close. Checked the book, didja?

LLAP
J:D

Post 24

Monday, July 16, 2007 - 7:37pm

No, yo estudie su nombre y lo recorde de corazon cuando lei Atlas por la primera vez. Yo no tengo el libro conmigo y no he buscado su nombre.

Post 25

Monday, July 16, 2007 - 7:46pm

John:

"Also, mucho thanx for the simple explanation about 'the Far Side' tide; never did understand all other 'explanations' given on that."

But no one has answered the question I posed:

As a further aside, is there anywhere else where there is weightlessness other than in orbit or in a parabolic airplane dive?

(sort of highjacking the thread)

I'll give the answer, if no one knows, after the next five posts.

Sam

Post 26

Monday, July 16, 2007 - 8:02pm

The center of the earth.

Post 27

Monday, July 16, 2007 - 8:58pm

Yep.

Monday, July 16, 2007 - 9:27pm

     Nope.
     In a gigantic hollow sphere, yep (there was a short SF story on that, btw); but, in the earth's center, or that of any other matter-condensed body? I don't think so...
     The matter surrounding one is presumed irrelevent (assuming one's not 'pressured' into quarkeens)? I disagree. I'd expect that one, if managing to reach there in one piece, would be pulled apart ('weight-wise') in 360x360 degrees (depending on matter-amt in the planetary body). The 'weight' would be merely in more than one direction and affectable like 'tidal forces' near a singularity, methinks.

LLAP
J:D

Post 29

Monday, July 16, 2007 - 9:36pm

~ However, there would be one other (type of) place.
~ I remember a while ago about the idea of two gravitational bodies (like, oh, the moon and earth) being considered as having some 'spot' 'twixt them where their gravitational forces 'cancel out', AND, such an idea being criticized as "Get real! Gravity isn't 'canceled' by another gravity field. They just overlap and one is stronger than the other depending where you are."

Ntl, find a 'place' twixt the two G-sources, and they will 'balance.' Put a 'container'/Station there, and a measurable object in its center, and it WILL be unaffected by the G tugs-of-war.--- We ARE talkin' bona-fide weightlessness and not the mere 'feeling' of it, correct?

LLAP
J:D

Post 30

Monday, July 16, 2007 - 9:38pm

John:

The question wasn't phrased such that a person would be weightless. Whether it's a hollow sphere or a sold earth, the object at the center is subjected to the uniform gravitational attraction radially outward and every component is cancelled by the gravitational attraction from the opposite direction, so there is no resultant force.

If you were to drop a ball down a hole to the center of the earth the attraction to the center would diminish with depth according to the amount of mass of the earth that was above it until it got to the center where there is equal radially upward gravitation in all directions.

Sam

Post 31

Monday, July 16, 2007 - 9:49pm

John: Weightlessness is experienced when the only forces acting on a body are gravitational ones. When you are standing up you are acted upon by gravitational forces but you are also subject to the reaction of the floor on your feet. Take the floor away and you're in free fall, and weightless.

I thought the context of my question was related to somewhere on earth, but maybe I wasn't explicit enough. The neutral point between two bodies would also qualify.

Sam.

Post 32

Monday, July 16, 2007 - 9:53pm

John, the center of any sphere, no matter how thick the shell of the sphere, is identical for this purpose. Think back to the shell method of integration for calculus.

Ted

Post 33

Monday, July 16, 2007 - 10:10pm

Sam:
I don't think 'cancel' is really the proper term here, as I think I pointed out; 'neutral', as in 'balance' is ok though.)

Ted:
You will argue that a matter-body, in a large enough 'hole' in the center of a neutron star, arriving there (carefully, of course) through a Star-Trek'ian tunnel thereto, and centered there, will be UNaffected (ie: no weight-pulling in all directions) by all surrounding mass? --- Contempory 'Math' (calculus) may support this, but, it also supported Mercury's expected arrival around the sun...which it didn't make 'till Einstein 'explained' why; ergo, spare me math refs.

LLAP
J:D

(Edited by John Dailey on 7/16, 10:42pm)

Post 34

Monday, July 16, 2007 - 11:40pm

John, assuming you have graduated high school, you will have heard the term, assuming ideal conditions. You should also know the meaning of the term pedantry.

Ted

Post 35

Tuesday, July 17, 2007 - 6:44am

Sam,
The gravitational force is zero not just at the center of a hollow sphere, but anywhere inside it. Also, the gravitational force is zero at the Langrange points of a system of gravitational bodies.
Thanks,
Glenn

Post 36

Tuesday, July 17, 2007 - 7:12am

Glenn:

"The gravitational force is zero not just at the center of a hollow sphere, but anywhere inside it."

My first reaction was to deny your statement but on further reflection I accept the possibility that you may be right. I'd have to see the proof.

If one takes a position just inside the shell at a particular point there is the bulk of the mass on the far side, but it is far away. There is a smaller mass above that position but it is close. I'd have to see the calculus. Do you have a reference?

Interesting.

Also, if one were to dig a hole in the earth about 1,000 miles deep anywhere on the orbital plane of the moon an object placed there would experience weightlessness about once every 23 hours.

Sam

Post 37

Tuesday, July 17, 2007 - 7:46am

Sam,
The proof usually consists of using a gravitational analogy of Gauss' law for electrostatics. But, an intuitive approach is basically like what you suggested.

Choose any point inside the shell, choose a direction, and form a cone around the line from the point to the shell. The solid angle of the cone will intercept a certain area on the shell (and therefore a certain amount of mass).

Now, go in the opposite direction and form a cone of the same solid angle. The area intercepted is proportional to the square of the distance from the point to the shell, and, therefore, so is the mass intercepted. But, the force due to the mass is inversely proportional to the square of the distance. The two effects cancel and the net force due to the two areas intercepted by the two equal solid angles in opposite directions is zero. Now, just integrate over the whole 4pi steradians!

And now back to our regularly scheduled topic.
Thanks,
Glenn

Post 38

Wednesday, July 18, 2007 - 12:43am

I do read some chapter of Human Action downloaded from mises.org . But I found its text and grammar is difficult to understand. I don't know whether this book was writtern in German and translated into English , or is written in English directly with a German literary mentality. As to Reisman's Capitalism, I have only read the Chapter which criticizes socialism. I have printed this book on paper and once brought it to the college. It was discovered one day by someone else and he said, "you actually read these reactionary books; you're so bold." I was scared and brought it back . Therefore it is far from finishing reading this book. In fact I have collect quite a few boos about liberty. I post this entry is to want to know more books of this kind and to see whether they can be found in the library of the college. In C-h-i-n-a information is classified into many "grades"; the more "sen-si-tive", the higher the grade is, and therefore the less the people who are able to read them. I want to know, given a certain level of grade (such as "college level" grade), what books can be found.

Post 39

Wednesday, July 18, 2007 - 1:23am