MAT 132 Midterm: MAT 132 SBU Exam Midterm 2sol

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31 Jan 2019
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Compute the average value of the function sin x on the interval [0, ]. Let s be the region bounded by the graph of y = x2 + 1, the x-axis, and the lines x = 0 and x = 1. Find the volume of the solid obtained by rotating s about the x-axis. State at the beginning which method you are using. Solution: the sketch below shows the region s together with a typical cross section of the solid. The disk method is clearly the natural choice in this case. y = x2 + 1. The cross section at distance x from the origin has radius x2 + 1, and so its area is given by a(x) = (x2 + 1)2. Note: it is also possible (although very cumbersome) to use the shell method. It follows that the volume of the solid is and a lengthy calculation shows that this integral has value 28 /15.

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