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ASTR430 HW#5 (due 11/23/05)

  1. Problem #15 from Ch. 9 (p. 269). Hint: for part (a), just estimate the total mass excavated and compute the energy required to lift it 10 times the crater diameter. Assume the acceleration due to gravity $ g$ over that height remains constant. You'll need to assume a bulk density for the material. For part (b), see Fig. 9-6.

  2. Problem #13 from Ch. 10 (p. 315). Hint: use the expression involving $ \phi$ in the mathematical notes on p. 297.

  3. Don't forget your term project essay!

Derek C. Richardson 2005-11-09