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Descrição do arquivo

DescriçãoShell-diag-1.png	A diagram illustrating the derivation of Newton's shell theorem. Shown is a thin shell with a test mass outside the shell (${\displaystyle r>R}$).
Data	29 de setembro de 2006
Fonte	Trabalho próprio pelo carregador
Autor	Jim Wisniewski

Licenciamento

Eu, titular dos direitos autorais desta obra, publico-a nos termos da seguinte licença:

A utilização deste arquivo é regulada nos termos da licença Creative Commons Atribuição-Partilha nos Termos da Mesma Licença 2.5 Genérica.

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Source

This image and the others in the same series (2, 3, 4) were generated from the MetaPost code presented below. The code is released under the same license as the images themselves.

% shell-diag.mp
% A diagram illustrating the derivation of Newton's shell theorem.  To be
% processed with MetaPost.

color bandshade, fillshade;
bandshade = 0.7 [blue, white];
fillshade = 0.9 white;

numeric dotsize, deg;
dotsize = 5 bp;
deg = length( fullcircle )/360;

freelabeloffset := 3/4 freelabeloffset;
labeloffset := 2 labeloffset;

def dot( expr P ) =
  fill fullcircle scaled dotsize shifted P withcolor black;
enddef;

def draw_circle( expr R, stroke ) =
  save p;
  pen p;
  p = currentpen;
  pickup p scaled stroke;
  draw fullcircle scaled 2R;
  pickup p;
enddef;

vardef anglebetween( expr a, b, rad, str ) =
  save endofa, endofb, common, curve, where;
  pair endofa, endofb, common;
  path curve;
  numeric where;
  endofa = point length( a ) of a;
  endofb = point length( b ) of b;
  if round point 0 of a = round point 0 of b:
    common = point 0 of a;
  else:
    common = a intersectionpoint b;
  fi;
  where = turningnumber( common--endofa--endofb--cycle );
  curve = (unitvector( endofa - common ){(endofa - common) rotated (90 * where)} ..
           unitvector( endofb - common )) scaled rad shifted common;
  draw thefreelabel( str, point 1/2 of curve, common ) withcolor black;
  curve
enddef;

def draw_angle( expr a, b, rad, str ) =
  begingroup
    save p;
    pen p;
    p = currentpen;
    pickup p scaled 1/2;
    draw anglebetween( a, b, rad, str );
    pickup p;
  endgroup
enddef;

def label_line( expr a, b, disp, str ) =
  begingroup
  save mid, opp;
  pair mid, opp;
  mid = 1/2 [a, b];
  opp = -disp rotated (angle( b - a ) - 90) shifted mid;
  draw thefreelabel( str, mid, opp );
  draw a -- b;
  endgroup
enddef;

def draw_thinshell( expr R, r, theta, dtheta, thetarad, phirad ) =
  begingroup
    save M, m;
    pair M, m;
    M = (0, 0);
    m = (r, 0);
    
    save circ;
    path circ;
    circ = fullcircle scaled 2R;
    
    save thetapt, dthetapt;
    pair thetapt, dthetapt;
    thetapt   = point (theta * deg) of circ;
    dthetapt  = point ((theta + dtheta) * deg) of circ;
    
    save upper, lower, band;
    path upper, lower, band;
    upper = subpath (0, 4) of circ;
    lower = subpath (4, 8) of circ;
    band = buildcycle( upper, (xpart thetapt,  R) -- (xpart thetapt,  -R),
                       lower, (xpart dthetapt, R) -- (xpart dthetapt, -R) );
    
    % draw figures
    save p;
    pen p;
    p = currentpen;
    pickup p scaled 1/2;
    fill band withcolor bandshade;
    draw band;
    pickup p;
    
    save near, far;
    pair near, far;
    if theta < 90:
      near = 3/4[ulcorner band, llcorner band];
      far  = right shifted near;
    else:
      near = 3/4[urcorner band, lrcorner band];
      far  = left shifted near;
    fi;
    draw thefreelabel( btex $dM$ etex, near, far );
    
    dot( M );
    %label.llft( btex $M$ etex, M );
    
    dot( m );
    label.lrt( btex $m$ etex, m );
    
    draw M -- thetapt;
    label_line( M, m, right, btex $r$ etex );
    label_line( m, thetapt, right, btex $s$ etex );
    if R <> r:
      label_line( M, dthetapt, left, btex $R$ etex );
    else:
      draw M -- dthetapt;
    fi;
    
    draw_angle( m -- M, m -- thetapt, phirad, btex $\phi$ etex );
    draw_angle( M -- m, M -- thetapt, thetarad, btex $\theta$ etex );
    draw_angle( M -- thetapt, M -- dthetapt, R, btex $d\theta$ etex );
  endgroup
enddef;

def draw_thickshell( expr Ra, Rb, r ) =
  begingroup
    save m;
    pair m;
    m = (r, 0);
    
    fill fullcircle scaled 2Rb withcolor fillshade;
    fill fullcircle scaled 2r  withcolor bandshade;
    unfill fullcircle scaled 2Ra;

    dot( origin );
    dot( m );
    label.lrt( btex $m$ etex, m );
    label_line( origin, m, right, btex $r$ etex );
    
    draw_circle( Rb, 2 );
    if Ra > 0:
      draw_circle( Ra, 2 );
      label_line( origin, dir( 100 ) scaled Rb, left,  btex $R_b$ etex );
      label_line( origin, dir( 80 )  scaled Ra, right, btex $R_a$ etex );
    else:
      label_line( origin, dir( 90 )  scaled Rb, left,  btex $R_b$ etex );
    fi;
  endgroup
enddef;

% Thin shell, r > R
beginfig(1)
  numeric R;
  R = 1 in;
  draw_thinshell( R, 3R, 50, 15, 1/4 in, 3/4 in );
  draw_circle( R, 2 );
endfig;

% Thin shell, r < R
beginfig(2)
  numeric R;
  R = 1 in;
  draw_thinshell( R, 0.7R, 125, 15, 1/8 in, 1/3 in );
  draw_circle( R, 2 );
endfig;

% Thick shell
beginfig(3)
  numeric Ra, Rb, r;
  Ra = 0.8 in;
  Rb = 1.3 in;
  r = 1 in;

  draw_thickshell( Ra, Rb, r );
endfig;

% Solid sphere
beginfig(4)
  numeric Ra, Rb, r;
  Ra = 0;
  Rb = 1.3 in;
  r = 1 in;
  
  draw_thickshell( Ra, Rb, r );
endfig;

end