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Lectures
Lecture: 27 (iq24)
1. Bungee Jumper,
a Satellite problem
2. Thermal Energy:
o Temperature, specific heat
o Mixing two blocks with
temperatures T1 and T2
3. Energy principle applied to
o Closed system: DEsys=0
o Open system: DEsys=Q+W+ other energy transfers (e.g. electric
energy …)
4. Power: Energy/time
o Power=F½v. Example: Vehicle engine
o Powerinput =dKinput/dt. Example:
Niagara fall
5. Dissipative force:
o Terminal velocity
o Air resistance: Falling of
coffee filters
o Irreversible work and
non-conservative force
Announcement:
o Physics 303L,
spring2011: My section will use MI
textbook, the other two sections will use the traditional textbook: Ohanian and Markert.
o Course summary of unit 3: A
draft version has been posted. Your feedback is welcome. Please call my
attention for errors.
o Today’s office hour: I will
not be available from 3-3:45.
Extra office hours today:
·
1-2:15
·
3:45-4:10