prac3b

# prac3b - Green’s theorem Problem 5 Consider the rectangle...

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18.02 Practice Exam 3 B 1 2 x Problem 1. a) Draw a picture of the region of integration of dydx. 0 x b) Exchange the order of integration to express the integral in part (a) in terms of integration in the order dxdy . Warning: your answer will have two pieces. Problem 2. a) Find the mass M of the upper half of the annulus 1 < x 2 + y 2 < 9 ( y 0) with y density = . x 2 + y 2 b) Express the x -coordinate of the center of mass, x ¯, as an iterated integral. (Write explicitly the integrand and limits of integration.) Without evaluating the integral, explain why ¯ x = 0. Problem 3. a) Show that F = (3 x 2 6 y 2 ı + ( 12 xy + 4 y is conservative. b) Find a potential function for F . c) Let C be the curve x = 1 + y 3 (1 y ) 3 , 0 ± y ± 1. Calculate F · d r . C Problem 4. a) Express the work done by the force ﬁeld F = (5 x +3 y ı +(1+cos y on a particle b moving counterclockwise once around the unit circle centered at the origin in the form f ( t ) dt . a (Do not evaluate the integral; don’t even simplify f ( t ).) b) Evaluate the line integral using
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Unformatted text preview: Green’s theorem. Problem 5. Consider the rectangle R with vertices (0 , 0), (1 , 0), (1 , 4) and (0 , 4). The boundary of R is the curve C , consisting of C 1 , the segment from (0 , 0) to (1 , 0), C 2 , the segment from (1 , 0) to (1 , 4), C 3 the segment from (1 , 4) to (0 , 4) and C 4 the segment from (0 , 4) to (0 , 0). Consider the vector ﬁeld F = ( xy + sin x cos y )ˆ ı − (cos x sin y )ˆ a) Find the ﬂux of F out of R through C . Show your reasoning. b) Is the total ﬂux out of R through C 1 , C 2 and C 3 , more than, less than or equal to the ﬂux out of R through C ? Show your reasoning. Problem 6. Find the volume of the region enclosed by the plane z = 4 and the surface z = (2 x − y ) 2 + ( x + y − 1) 2 . (Suggestion: change of variables.)...
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## This note was uploaded on 05/04/2011 for the course MATH 18.02 taught by Professor Auroux during the Spring '08 term at MIT.

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prac3b - Green’s theorem Problem 5 Consider the rectangle...

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