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Altitude "Above or Below" a Sphere

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Explanations 1

When you're flying, what does it mean to be "distance xxx above the ground" or "at an altitude of xxx"? Well first, say the Earth is approximately a sphere of radius rrr, with c…
By Victor Wang

Problems 2

Now imagine that the rope is lifted at all points simultaneously, so that it floats above the Earth at the same height all along its length. What is the largest thing that could…
Imagine a ribbon that runs completely around the Earth's equator flat against the ground. You cut the ribbon and tie in another piece of ribbon that is 710 inches long. That inc…