# Math 246 Quizzes and Homeworks, Fall 2010

There will be eleven short in-class quizzes based on homeworks. Homeworks will not be collected.
• Quizzes on material covered on the first in-class exam (23 September)

• Quizzes on material covered on the second in-class exam (28 October)

• Quizzes on material covered on the third in-class exam (2 December)

No calculators, books, or notes may be used during quizzes. All items except pens, pencils, and erasers must be off the desktops.
Quizzes will be given at the beginning of the class period. They will be short. Please be sure to arrive on time!

These eleven in-class quizzes will be worth 10 points each. Your ten best quiz scores will go toward your course grade. No make-up quizzes will be given.

If the University closes on the day of a scheduled quiz and no exam is scheduled that week then the quiz will be given the next time the class meets. If the University closes on the day of a scheduled quiz and an exam is scheduled that week then the quiz will be cancelled.

HOMEWORKS

Below are the weekly homework assignments. These will not be collected. However the material from the homework will appear on the quizzes and exams. The dates given are when the material is first scheduled to be tested on either an exam or a quiz. Quiz material should be covered during the lectures and discussion sections just before the quiz. You are responsible for the material even if the University closes on the day of the discussion section. It is a good idea to look over all material before it is covered in the lectures.

These assignments are subject to changes announced either in class or on this webpage.

## Homework Assignments

Assignments on Topics Covered on the First Exam (Thursday, 23 September)

• Quiz on Tuesday, 7 September (Classification, Linear, Separable)
Boyce and DiPrima (BD) Section 1.3 --- 1-7, 9, 11, 17
BD Section 2.1 --- 3c, 6c, 9c, 12c, 15, 30-33
BD Section 2.2 --- 1-4,6-19, 22, 23
BD Section 2.4 --- 3, 6, 9, 12, 15, 22

• Quiz on Tuesday, 14 September (Graphical Methods, and Applications)
BD Section 1.1 --- 16, 18, 20, 26, 29, 31
BD Section 2.3 --- 2, 3, 5, 9, 10, 11, 13, 16, 23
BD Section 2.5 --- 1, 3, 5, 7, 9, 13, 20, 23

• Quiz on Tuesday, 21 September (Numerical Methods)
BD Section 8.1 --- 1, 7, 9, 23
BD Section 8.2 --- 1, 7, 9, 14
BD Section 8.3 --- 1, 7, 9
BD Section 2.6 (Exact Equations) --- 1, 2, 3, 4, 5, 6, 7, 8, 9

• Exam on Thursday, 24 September (Exact Equations and Integrating Factors)
BD Section 2.6 --- 13, 22, 25, 27

Assignments on Topics Covered on the Second Exam (Thursday, 28 October)

• Quiz on Tuesday, 5 October (General Homogeneous)
BD Section 3.2 --- 1, 3, 5, 8, 11, 13, 16, 24, 25
BD Section 4.1 --- 1, 4, 5, 11, 15, 17, 21 ,23

• Quiz on Tuesday, 12 October (Constant Coefficient Homogeneous)
BD Section 3.1 --- 1, 3, 5, 7, 9, 13, 17, 23
BD Section 3.3 --- 1, 3, 5, 7-14, 17-22
BD Section 3.4 --- 1-7, 11, 12, 15, 19, 20, 21, 23-28
BD Section 4.2 --- 12, 19, 32

• Quiz on Tuesday, 19 October (Constant Coefficient Nonhomogeneous: Undetermined Coefficients)
BD Section 3.5 --- 1, 3, 5, 9, 11, 13, 17, 21, 28
BD Section 4.3 --- 1, 2, 5, 9, 11

• Quiz on Tuesday, 26 October (General Nonhomogeneous: Variation of Parameters)
BD Section 3.6 --- 1, 5, 9, 13, 15, 17, 19, 23, 28
BD Section 4.4 --- 3, 10, 15

• Exam on Thursday, 28 October (Mechanical Vibrations)
BD Section 3.7 --- 1, 5, 7, 9, 11
BD Section 3.8 --- 5, 6, 7, 18, 19

Assignments on Topics Covered on the Third Exam (Thursday, 2 December)

• Quiz on Tuesday, 9 November (Laplace Transform)
BD Section 6.1 --- 1, 2, 3, 5, 6, 9, 11, 13, 17
BD Section 6.2 --- 1, 3, 5, 9, 11, 15, 19, 21, 23
BD Section 6.3 --- 1, 3, 5, 11, 15, 17
BD Section 6.4 --- 1, 2, 3, 5, 6, 9, 10, 11

• Quiz on Tuesday, 16 November (General Linear Systems and Systems with Constant Coefficients)
BD Section 7.1 --- 1, 3, 7, 9, 17, 22
BD Section 7.2 --- 2, 4, 6 (you may use Matlab), 10, 11, 23, 26
BD Section 7.3 --- 1, 4, 28
BD Section 7.4 --- 6, 7
BD Section 7.5 --- 1, 5, 9, 11, 16, 18, 24, 29

• Quiz on Tuesday, 23 November (Linear Systems with a Constant Coefficient Matrix)
BD Section 7.3 --- 15, 17, 19, 21
BD Section 7.6 --- 1, 2, 3, 4, 5, 9, 10, 13, 20
BD Section 7.7 --- 1, 3, 4, 5, 7, 8, 9, 11
BD Section 7.8 --- 1, 3, 5, 7, 9

• Quiz on Tuesday, 30 November (Phase Portrait Classification for Linear Planar Systems)
BD Section 9.1 --- 3, 5, 7, 9, 11, 13, 15, 17

• Exam on Thursday, 2 December (Nonlinear Phase Portraits)
BD Section 9.2 --- 2, 4, 6, 8, 19