3. one point, from Lectures 2-4, involves calculation, not necessary to type.

(b) .6 from Lectures 3 and 4, Falling Down the Stairwell of Sterling Hall. This problem will not have a ``nice '' whole-number answer. First estimate how tall Sterling Hall is in meters from the floor of the basement to the roof. You don't have to see the building to do this. I will tell you that there is a basement and then four stories, and the ceilings are higher than in an average house. Call the estimated height of the building h. You must explain your reasoning to get credit for your estimate. (.3)
Next calculate how long a time t  it takes for an object dropped down the stairwell from the ceiling of the top floor to hit the floor of the basement. Use h=½gt², g=10m/s², and whatever you estimated for h. (.3)

question 5(a), due Wednesday, September 17

5. one point, from Lectures 3 and 5, a group question, involves short answers

(a) .6 from Lecture 3, Terrestrial Motion. Aristotle and Galileo found different rules for motion at or near the surface of the earth. Contrast three features of their theories (.3),
incorporating into your answers how Galileo reached his conclusions. (.3)

Revised September 4, 1997.