Thursday, June 2, 2011

Announcements:

• Exam 2 is today during regular class time: Chapters 7-12.

Results:

• This exam was more challenging than it should have been (my fault), and so I will grade this exam out of 95 points instead of 100 and still provide an extra 5 points for students who submit Test Corrections as for Exam 1 (see below).
• Exam scores for the multiple-choice section should be available via the onyen or Connect Carolina websites if you filled in you PID on the Scantron form. Adjusted scores will be posted on Blackboard.
• Summary of results from MC section:
• Average =  56% (compared with 61% for Exam 1 and ~60% on this exam in previous years)
• Std. Dev. = 16%
• High = 88%
• Low = 16%  (expected score for random guessing is 26%)
• The total Exam 2 score will include 75 points for the MC section plus 25 points for the Flywheel RWP.
• With extra credit, the average score on this exam will likely be ~70% (same as Exam 1), with highest score of ~100%.  The maximum possible score is 115/95 = 120% with original RWP.
• Since the class average on this exam was lower than I expected, you have an opportunity to boost your grade and learn from your mistakes through Test Corrections:
• Provide written justification (preferably on your original test papers - use back sides or other paper as needed) to demonstrate that you understand each question you missed (or questions you happened to get right because you guessed correctly).
• Discuss your explanations with someone who understands at least as much physics as you do.  Have this person sign the following statement at the top of your test paper: “I am convinced that [your name] fully understands the concepts and problem solutions for this exam.” Signed ____________    Hopefully by discussing your answers with another person, you will better understand and remember the correct reasoning in case you are faced with a similar question on the final exam or later in life.
• Submit your original test papers with corrections by Thursday, June 9 (one week after the exam), and assuming that your explanations are all correct, 5 points will be added to your exam score.
• Answers to multiple-choice questions:
• Version 101: C, C, C, B, D, B, A, B, B, C, C, B, D, C, D, C, C, C, C, C, C, A, C, A, D
• Version 102: C, C, C, B, B, D, B, A, B, C, C, D, B, D, C, C, C, C, C, C, A, C, D, A, C
• For the flywheel real-world problem, only a couple of students signed the honor pledge. Remember that you were not allowed to discuss this problem with anyone else (other than Dr. Deardorff). I have learned that at least one student sought advice on this problem from a private tutor, and this is a clear violation of the Honor Code. You will only receive credit on this problem if you attest that the work you submitted is your own and that you did not receive any unauthorized assistance on this problem.