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Informal sessions:

o Tu 3:30-4:20pm, RAS 218;

o Fri 4-4:50pm, ECJ 1.204.

Lecture 17: Newton’s law of gravity - I

1. Determine the mass of the earth

2. g(r) in the outer space

3. Satellites circulating around the earth

4. Planetary motion

· Historical notes

· Kepler’s law

Reminders:

• Instructor’s Tuesday informal session: Overview of this week’s lessons.
• Read chapter 9.
• Work on HW7. After today’s lesson you should be able to do about half of hw7.