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% period of the Earth rotation, in seconds
T = 24*3600;

% angular frequency of Earth's rotation, in radians per second
Om = 2*pi/T;

% radius of the Earth, in meters
R = 6.4e6;

% acceleration of gravity at the Earth surface, in m/s^2
g = 9.8;

% The radius of the satelite's orbit, in meters
r0 = (g*R^2/Om^2)^(1/3)

%
rr = R/r0

% The maximal value of the tension per density
tpr = g*R*(1.0 - rr) - 1/2*Om^2*R^2*(1.0/rr^2 - 1.0)

% Tensile strength for steel, in Pa
st = 4.e6;

% density of steel, in kg/m^3
rho = 8.0e3;

available = st/rho