1. (1) In ry-plane, sketch the region R which is enclosed by the following: • the part of the circle z² + y² = 4 with a > 0; • the line y = 1; • the part of the circle r² + y² = 1 in the second quadrant; • the line through the points (-1,0) and (v3, –1).

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Chapter2: Second-order Linear Odes
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Hi i need help with second part of question 1, find parametrisation of the curve. Thanks

1. (1) In ry-plane, sketch the region R which is enclosed by the following:
• the part of the circle r² + y = 4 with r > 0;
• the line y = 1;
• the part of the circle x² + y² = 1 in the second quadrant;
• the line through the points (-1,0) and (/3, –1).
(2) The boundary of R is a curve C with four pieces corresponding to the four curves in (1). Find
the parametrisation for C by considering it as the following motion:
• starting at the point (0, 1);
• going around the origin in the counter-clockwise direction;
• being unit speed.
Note: The parameter needs to start at 0 and change continuously for the whole curve C. Don't
worry about the vertices where the motion suddenly changes direction.
2. For the curve C in Problem 1,
(1) calculate the total arc length;
(2) calculate the line integral
for the vector field V = (y, –x);
(3) calculate the line integral
for the vector field W = (x, 2y).
(4) decide whether V and W are conservative, and explain your answers.
Transcribed Image Text:1. (1) In ry-plane, sketch the region R which is enclosed by the following: • the part of the circle r² + y = 4 with r > 0; • the line y = 1; • the part of the circle x² + y² = 1 in the second quadrant; • the line through the points (-1,0) and (/3, –1). (2) The boundary of R is a curve C with four pieces corresponding to the four curves in (1). Find the parametrisation for C by considering it as the following motion: • starting at the point (0, 1); • going around the origin in the counter-clockwise direction; • being unit speed. Note: The parameter needs to start at 0 and change continuously for the whole curve C. Don't worry about the vertices where the motion suddenly changes direction. 2. For the curve C in Problem 1, (1) calculate the total arc length; (2) calculate the line integral for the vector field V = (y, –x); (3) calculate the line integral for the vector field W = (x, 2y). (4) decide whether V and W are conservative, and explain your answers.
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