Assuming that Earth is spherical with radius a = 6400km and has a uniform densit

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Assuming that Earth is spherical with radius a = 6400km and has a uniform density of rho = 5.5Mg/m3. Evaluate U0 at the geographic poles and at the equator. What would be the value of J2 for such an Earth? If a rigid steel belt wrapped about the (real) Earth's equator, along the surface of the geoid, were rotated 90 degree to follow a meridian of longitude, it would no longer fit the surface If the belt remained a circle centred on Earth's centre, how high above the surface would it be on average?

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