The following details may be useful in your space elevator calculations:

Mass of Earth (M): 5.976 X 10^24 kg

(Equatorial) Radius of Earth: 6,378 km

Gravitational Constant (G): 6.673 X 10^(-11) m^3/(kg s^2)

Mass of a "Climber" (including payload): 2000 kg

Ribbon mass density: 1300 kg/m^3
Ribbon Tensile Strength 1.3x10^11 N/m

To simplify the calculations, we will assume that all the masses (Earth, space station, etc.) are point masses. This means that we can treat the objects as if all their mass exists at a single point, called the center of mass. In the case of the altitude problem, it is important to consider whether you have calculated the distance to Earth's surface or its center.

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