5.3 Path Integrals of Vector Fields 325 15. Suppose that a continuous function f is integrated along two different paths joining the points (1, 2) and (3, -5), and two different answers are obtained. Is that possible, or has an error been made in the evaluation of integrals? 16. Compute the integral of f(x, y) = xy – x - y +1 along the following curves connecting the points (1, 0) and (0, 1): (a) C1: circular arc c1(t) = (cos t, sin t), 0 < t

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5.3 Path Integrals of Vector Fields
325
15. Suppose that a continuous function f is integrated along two different paths joining the points
(1, 2) and (3, -5), and two different answers are obtained. Is that possible, or has an error been made
in the evaluation of integrals?
16. Compute the integral of f(x, y) = xy – x - y +1 along the following curves connecting the
points (1, 0) and (0, 1):
(a) C1: circular arc c1(t) = (cos t, sin t), 0 < t <T/2
(b) c2: straight-line segment c2(t) = (1 – t, t), 0 <t < 1
(c) C3: from (1, 0) horizontally to the origin, then vertically to (0, 1)
(d) C4: from (1, 0) vertically to (1, 1), then horizontally to (0, 1)
(e) c5: circular arc c5(t) = (cos t, - sin t), 0 <t < 3n/2.
%3D
17. Compute the area of the part of the cylinder x? + y² = 4 between the xy-plane and the plane
Z = y +2.
%3D
18. Compute the area of the part of the surface y =x defined by 0 <x < 2,0 <:s2.
%3D
19. Compute the area of the part of the surface y = sin x, 0 <x </2, above the xy-plane and
below the surface z = sin x cos x.
%3D
20. Let e be the straight-line segment joining (1, 0, 0) and (0, 2, 0), Use a geometric argument (i.e.,
do not evaluate the integral) to find (x+3y) ds.
21. Use a geometric argument to find ety ds, where e is the circle centered at the origin of
radius 4.
22. Argue geometrically that , sin (x') ds 2 0, wherec is the graph of y= tan.x,-7/4 sx S/4.
23. Is it possible that the average value of f(x, y) = sinx cos y along some curve e is equal to 5?
24, Write down the version of the statement of Theorem 5.2 in the case where e is a piecewise C!
Transcribed Image Text:5.3 Path Integrals of Vector Fields 325 15. Suppose that a continuous function f is integrated along two different paths joining the points (1, 2) and (3, -5), and two different answers are obtained. Is that possible, or has an error been made in the evaluation of integrals? 16. Compute the integral of f(x, y) = xy – x - y +1 along the following curves connecting the points (1, 0) and (0, 1): (a) C1: circular arc c1(t) = (cos t, sin t), 0 < t <T/2 (b) c2: straight-line segment c2(t) = (1 – t, t), 0 <t < 1 (c) C3: from (1, 0) horizontally to the origin, then vertically to (0, 1) (d) C4: from (1, 0) vertically to (1, 1), then horizontally to (0, 1) (e) c5: circular arc c5(t) = (cos t, - sin t), 0 <t < 3n/2. %3D 17. Compute the area of the part of the cylinder x? + y² = 4 between the xy-plane and the plane Z = y +2. %3D 18. Compute the area of the part of the surface y =x defined by 0 <x < 2,0 <:s2. %3D 19. Compute the area of the part of the surface y = sin x, 0 <x </2, above the xy-plane and below the surface z = sin x cos x. %3D 20. Let e be the straight-line segment joining (1, 0, 0) and (0, 2, 0), Use a geometric argument (i.e., do not evaluate the integral) to find (x+3y) ds. 21. Use a geometric argument to find ety ds, where e is the circle centered at the origin of radius 4. 22. Argue geometrically that , sin (x') ds 2 0, wherec is the graph of y= tan.x,-7/4 sx S/4. 23. Is it possible that the average value of f(x, y) = sinx cos y along some curve e is equal to 5? 24, Write down the version of the statement of Theorem 5.2 in the case where e is a piecewise C!
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