(a) Calculate the centroid (7, j) of the region under the graph y = cos x for 0 < x

Functions and Change: A Modeling Approach to College Algebra (MindTap Course List)
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ChapterA: Appendix
SectionA.2: Geometric Constructions
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5. (a) Calculate the centroid (ã, g) of the region under the graph y = cos x for 0 < x < T/2.
(b) Show that if R is revolved about the x-axis, the volume swept out is (2ng)A, where A
is the area of R.
(c) Show that if R is revolved about the y-axis, the volume swept out is (27ī)A.
In either case, the volume is equal to the area of R multiplied by the distance traveled
by the centroid of R under revolution. (It turns out same result is true for a general
region R, according to Pappus's theorem.)
Transcribed Image Text:5. (a) Calculate the centroid (ã, g) of the region under the graph y = cos x for 0 < x < T/2. (b) Show that if R is revolved about the x-axis, the volume swept out is (2ng)A, where A is the area of R. (c) Show that if R is revolved about the y-axis, the volume swept out is (27ī)A. In either case, the volume is equal to the area of R multiplied by the distance traveled by the centroid of R under revolution. (It turns out same result is true for a general region R, according to Pappus's theorem.)
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