MAT1575: Calculus 2

Instructor: Suman Ganguli | Fall 2023

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Class 20 Recap (Wed Nov 8)

Class Info

  • Date: Wed Nov 8
  • Meeting Info: 10a-11:40a, N719

Announcements

WebWork:

  • “Applications – Volumes of Revolution” (due Friday Nov 9)

Exam #2:

  • Our 2nd midterm exam will be Wednesday (Nov 14)
  • See this post for a list of topics and review exercises for the exam
  • Please start working on those review exercises, which I will collect later in the semester as a HW assignment

Topics

We reviewed the last exercise on the “Volumes of Revolution” WebWork, which asked for the volume of a torus:

We found that setting up an integral for this volume is rather complicated, but in fact it’s quite straightforward to find the volume if we “cut” the torus and “unwrap” it–so that we see that it has the same volume as a cylinder. Here is an illustration (from this website) of what we discussed, and what I tried to draw on the board:

We then did some additional examples of improper integrals. We revisited the improper integral we calculated on Monday, which “converges” to a finite number, even though we are integrating over an infinite interval:

You can also see that example in this PatrickJMT video:

We contrasted this with the improper integral of 1/x over the same interval, which we saw diverges to infinity. That example is worked out in Sec 3.7 of the textbook:

You should also read Example 3.48, which is an improper integral for a volume of revolution via the disk method!

Exam #2: Topics/review exercises

As I discussed in class, our 2nd midterm exam will be Wednesday (Nov 14). See below for a list of topics and review exercises for the exam.

(The review exercises are taken from the MAT1575 Final Exam Review sheet, which is available as a pdf from Files or from the Math Department course listings page. I have included a partial screenshot below–but note that the full pdf includes the answers to the exercises, so that you can check your solutions.)

Please start working on the review exercises for this exam, and write out solutions to them. I will collect these (plus additional exercises from the Final Exam Review sheet) later in the semester as a HW assignment.

Here’s the list of exercises to review for this upcoming exam again, with some additional notes:

#1(a)(b) & #2(a)(b): integration by u-substitution and integration by parts, respectively–these topics were covered on Exam #1, so you could also consult the solutions for that exam

#3(b): area between curves–note that #3(a) was the exercise given on Quiz #3. Set up #3(b) according to the same steps. Draw a sketch of the graph of the two curves and the region enclosed.

#4(a)(c): volumes of solids of revolution. For #4(a), use the disk method. For #4(c), use the method of cylindrical shells. For each, sketch the region in the xy-plane, and attempt to sketch a representative disk/cylindrical shell before setting up and solving the definite integral for the volume.

#6(a)(b): integration by the method of partial fractions. Note that the denominator #6(a) consists of a “repeated linear factor”, whereas #6(b) is the simpler case of “distinct linear factors” (the exercise on Quiz #3 was a case of distinct linear factors)

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