1. Problem 1.3.**I**

2. Problem 2.2.**I** (Optional)
This is probably the hardest problem we'll look at this semester.

3. Problem 2.4.**I**: For part a), calculate also the
velocity (relative to Earth) necessary to i) hit the Sun, ii) leave
the Solar System, iii) go into a circular orbit about the Sun at i~90
degrees, and iv) reach Mercury's orbit. Rank in order of increasing
difficulty. Which have our spacecraft done? Note: the
first edition of the book does not have parts d) and e)!

4. Problem 2.10.**I**

5. Problem 2.16.**I**. Now, work out the potential at any point interior to a spherical shell.
(Optional) Can you work out the potential at any point interior to an ellipsoidal shell?

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