Monday, October 8, 2001

• Current events - applications of science for good or evil
• Bombing in Afghanistan
• Nobel Prize in Medicine
• Where to go for complete solutions to homework problems:
• Student Study Guide and Solutions Manual
• Tutorial Center (but only TAs are allowed access to solutions manuals)
• Select textbook problem solutions are on reserve in Davis library - Ed Ludwig
• Web project topics - discuss with your group members and send your top three choices to me by email.
• Monday office hours moved to Tuesday at 1:00 pm

angular speed:  rate of change in angular displacement
angular acceleration:  rate of change in angular speed

Note:  angular speed and acceleration use radians:  2*PI radians = 360 degrees

The table on p. 181 shows the rotational analog of the corresponding linear motion variables.

Distinguish between:
 - angular speed and tangential speed
 - angular acceleration and tangential acceleration

Ponderable:  For a car accelerating up the on-ramp of a highway, find:
 a) linear acceleration of the car
 b) tangential acceleration of a point on the wheel
 c) angular acceleration of a wheel
 d) the tangential speed of a point on the wheel when the car reaches 60 mph
 e) the angular speed of a wheel when the car reaches 60 mph

Centripetal acceleration results from a force directed toward the center of the circular path.
 - Forces that cause centripetal acceleration are gravity (for satellite motion) and the tension in a string
 - Centrifugal forces do not exist.  What feels like a force is actually inertia.

Gravitational force acts between any two objects that have mass:  Fg = G*m1*m2/r^2

Kepler's laws of planetary motion (not emphasized in this course).

Assignments:

• HW7b (due Friday)
• RWP7 - Proper Speed Limit (due Friday)
• Web project topics (due Monday, but may be submitted sooner)