PHYS 1220 Round 5 Retests

The criteria for satisfying the standards are explained in the table below.

Standard	Quiz	Criterion
1	none
2	Standard 2 Retest 5	3 of 3
3	Standard 3 Retest 4	5 of 6
4	none
5	none
6	Standard 6 Retest 4	2 of 2
7	Standard 7 Retest 4	2 of 2
8	Standard 8 Retest 4	4 of 4
9	Standard 9 Retest 4	5 of 5
10	Standard 10 Retest 4	8 of 9
11	Standard 11 Retest 4	7 of 8
12	Standard 12 Retest 4	1 of 1
13	Standard 13 Retest 3	7 of 8
14	Standard 14 Retest 3	4 of 5
15	Standard 15 Retest 3	5 of 5
16	Standard 16 Retest 3	14 of 16
17	Standard 17 Retest 3	3 of 3
18	Standard 18 Retest 3	4 of 4
19	Standard 19 Retest 3	1 of 1
20	Standard 20 Retest 1	3 of 3
21	Standard 21 Retest 2	3 of 3
22	Standard 22 Retest 2	1 of 1
23	Standard 23 Retest 2	4 of 4
24	Standard 24 Retest 2	6 of 8
25	Standard 25 Retest 2	4 of 5
26	Standard 26 Retest 2	3 of 3
27	Standard 27 Retest 2	3 of 3
28	Standard 28 Retest 1	3 of 4
29	Standard 29 Retest 2	3 of 3
30	Standard 30 Retest 2	5 of 6
31	Standard 31 Retest 2	9 of 10

If you think anything was graded inconsistently or in error, let me know.  I want you to be credited for what you understand.

Grader's notes

Standard 9 Retest 4: There was a weird problem with Question 1 of this quiz.  It didn't generate a random number for the work done, which deprived you of a number you needed to use to find the answer.  In fact, since the question described an isothermal process fo an ideal gas, the heat absorbed was equal to the work done—precisely the number it didn't tell you.  So I just gave the point for that question to everyone.  What else could I do?

Standard 26 Retest 2: I accidentally set the wrong date for this quiz, so it didn't open for you.  An alert student brought this to my attention during the exam; I changed the date, but many of you had already left.  I apologize for the missed opportunity.

Standard 31 Retest 2: Let me tell you how to answer the last question on this quiz.  It had you find the maximum voltage of a simplistic AC generator consisting of a single circular loop of radius r spinning with frequency f in a uniform magnetic field B.  The maximum flux through the loop is Bπr², and the flux varies with time as Bπr²cos(ωt).  (The angular frequency ω in this equation is ω = 2πf.)  The emf induced around the single loop is the rate of change of this flux: V = dΦ/dt = −ωBπr²sin(ωt).  The maximum emf induced then is the amplitude of this function, or ωBπr².