(a) What is the maximum size of a nonspherical asteroid? (b) What length of steel wire can...

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(a) What is the maximum size of a nonspherical asteroid?

(b) What length of steel wire can hang vertically without breaking? What length of carbon nanotube? What are the prospects for creating a tether that hangs to Earth’s surface from a geostationary satellite?

(c) Can a helium balloon lift the tank used to transport its helium gas? (Purcell, 1983).

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