Exam 15: Topics in Vector Calculus

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Is F(x, y) = 7x i + 8y j is a conservative vector field?

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Use Stokes' Theorem to evaluate \int C 2(x + y)dx + 2(2x - 3)dy + 2(y + z)dz over the boundary of the triangle with vertices (2, 0, 0), (0, 3, 0), and (0, 0, 6) traversed in a counterclockwise manner.

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Evaluate Evaluate   where F(x, y, z) = 12z i + 12x j + 12y k and C is the helix r(t) = sin t i + 3 sin t j + sin<sup>2</sup>t k for   . where F(x, y, z) = 12z i + 12x j + 12y k and C is the helix r(t) = sin t i + 3 sin t j + sin2t k for Evaluate   where F(x, y, z) = 12z i + 12x j + 12y k and C is the helix r(t) = sin t i + 3 sin t j + sin<sup>2</sup>t k for   . .

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Use Green's Theorem to evaluate \int 4(3x2 + y)dx + 8xy3dy where C is the rectangle bounded by x = -1, x = 3, y = 0, and y = 2.

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Use the divergence theorem to evaluate  Use the divergence theorem to evaluate   where F(x, y, z) = 11yz i + 11xy j + 11xz k, n is the outer unit normal to  \sigma , and  \sigma  is the surface enclosed by the cylinder x<sup>2</sup> + z<sup>2</sup> = 1 and the planes y = -1 and y = 1. where F(x, y, z) = 11yz i + 11xy j + 11xz k, n is the outer unit normal to σ\sigma , and σ\sigma is the surface enclosed by the cylinder x2 + z2 = 1 and the planes y = -1 and y = 1.

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Evaluate the surface integral Evaluate the surface integral   where   is the part of the plane   in the first octant. where Evaluate the surface integral   where   is the part of the plane   in the first octant. is the part of the plane Evaluate the surface integral   where   is the part of the plane   in the first octant. in the first octant.

(Multiple Choice)
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If F(x, y, z) = 7y j + 7z k, the magnitude of the flux through the portion of the surface σ\sigma that lies in front of the xz-plane, where σ\sigma is defined by y = 1 - x2 - z2, is

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Use Green's Theorem to evaluate Use Green's Theorem to evaluate   , where C is the circle   . , where C is the circle Use Green's Theorem to evaluate   , where C is the circle   . .

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Sketch the vector field, F(x, y) = -5x j, by drawing some typical non-intersecting vectors. The vectors need not be drawn to the same scale as the coordinate axes, but they should be in the correct proportions relative to each other.

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Evaluate the surface integral  Evaluate the surface integral   where  \sigma  is that portion of the plane x + 2y + 3z = 6 which lies in the first octant. where σ\sigma is that portion of the plane x + 2y + 3z = 6 which lies in the first octant.

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Find the surface area of (x - 7)2 + (y + 1)2 + (z - 4)2 = 4 that lies below z = 6.

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Evaluate the surface integral  Evaluate the surface integral   where  \sigma  is that portion of the cylinder x<sup>2</sup> + z<sup>2</sup> = 1 that lies above the xy-plane enclosed by 0  \le  y  \le  5. where σ\sigma is that portion of the cylinder x2 + z2 = 1 that lies above the xy-plane enclosed by 0 \le y \le 5.

(Essay)
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Find the outward flux of F(x, y, z) = 4x i + 4y j + 4(z - 2)k across the rectangular box with vertices (0, 0, 0), (0, 0, 1), (0, 1, 0), (0, 1, 1), (3, 0, 0), (3, 1, 0), (3, 0, 1), and (3, 1, 1).

(Multiple Choice)
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Use Stokes' Theorem to evaluate \int C -21 dx + 21x dy + 7z dz over the circle x2 + y2 = 1, z = 1 traversed counterclockwise.

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Find the surface area of (x - 1)2 + (y + 1)2 + (z - 4)2 = 4 that lies below z = 4.

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Evaluate the surface integral  Evaluate the surface integral   where  \sigma  is the portion of the cone   for 0  \le  x  \le  3. where σ\sigma is the portion of the cone  Evaluate the surface integral   where  \sigma  is the portion of the cone   for 0  \le  x  \le  3. for 0 \le x \le 3.

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F(x, y, z) = 9x2 i + (2y - 4) j + 3k. Find div F.

(Multiple Choice)
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Evaluate  Evaluate   where F(x, y, z) = 2x i + 2y j + 4z k and  \sigma  is that portion of the surface z = 4 - x<sup>2</sup> - y<sup>2</sup> above the xy-plane oriented by upward unit normals. where F(x, y, z) = 2x i + 2y j + 4z k and σ\sigma is that portion of the surface z = 4 - x2 - y2 above the xy-plane oriented by upward unit normals.

(Essay)
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Evaluate the surface integral  Evaluate the surface integral   where  \sigma  is that portion of the cylinder y<sup>2</sup> + z<sup>2</sup> = 1 that lies above the xy-plane enclosed by 0  \le   x  \le  5 and -1  \le   y  \le  1. where σ\sigma is that portion of the cylinder y2 + z2 = 1 that lies above the xy-plane enclosed by 0 \le x \le 5 and -1 \le y \le 1.

(Multiple Choice)
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Is F(x, y) = 2y i + 2x j is a conservative vector field?

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