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Informal sessions:

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

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

Lecture 13

Work energy theorem:

• Conservation of energy equation: Special case when F^ext=0, f=0
• What is network?

Applications:

• Pulley problems
• Path independent Properties:

o Change of potential energy: U_f-U_i

o Network: K_f-K_i

• Exercises on the conservation of energy equation

Reminders:

o Bring your questions on HW5 to today’s Instructor’s Informal Session. (Time and place see above)

o Exam1 grading is essentially completed. If your exam record still has a problem, please email Matt and cc a copy to me asap.

How to determine your exam letter grade?

Definition: Scaled score = (Rawscore – Average) x 100/std +500, where std=standard deviation.

For the exam, you have made two letter-grades.

o The first letter grade is based on the percent-score-cutoffs.

They are: 40%, 55%, 75% and 90% for D, C, B and A respectively;

o The second letter-grade is based on the scaled-score-cutoffs.

They are: 400, 450, 525, and 600 for D, C, B and A respectively.

If these two letter-grades are not the same, the better of the two is what you have made.

o I-clicker records are not yet ready. Just received words from the Quest team that they have begun working on the I-clicker records now.