Name: ID: Math 233 Exam 1. Page 1
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1 Page 1 Name: ID: This exam has 20 multiple choice questions, worth 5 points each. You are allowed to use a scientific calculator and a 3 5 inch note card. 1. Which of the following pairs of vectors are parallel? I. A = 3, 2 and B = 9, 6 II. P Q and OR, where P = (1, 1, 0), Q = (3, 5, 2), R = ( 1, 2, 1), and O is the origin. III. A = 2, 1 and P Q, where P = (0, 1) and Q = (2, 1). (a) none of them (b) only I (c) only II (d) only III (e) only I and II (f) only I and III (g) only II and III (h) all of them 2. Let A and B be vectors, where A = 2, B = 3, and where the angle between A and B is π/6 radians. What is A B? (a) 6 (b) 3 3 (c) 3 2 (d) 3 (e) 0 (f) 3 (g) 3 2 (h) 3 3 (i) 6
2 Page 2 3. What is the shortest distance between the point P = (1, 5) and the line passing through the points (0, 0) and (1, 1)? (a) 0 (b) 1 (c) 2 (d) 2 (e) 5 (f) 2 2 (g) 3 (h) 4 (i) 5 (j) In the following picture, A = 2, 4, 5 and B = 1, 1, 0. What is the vector C? (a) , 0 (b) 1, 1, 5 (c) 6, 6, 0 (d) 3, 5, 5 (e) 1, 1, 0 (f) 3, 3, 0 (g) 5, 5, 3 (h) 1, 3, 5 (i) 2, 4, 5 (j) 5, 5, 2
3 Page 3 5. Which one of the following parametric equations does NOT describe the line passing through the points (2, 0, 1) and (3, 3, 3)? (a) X(t) = (2 + t, 3t, 1 + 2t) (b) X(t) = (3 t, 3 3t, 3 2t) (c) X(t) = (2 + 2t, 6t, 1 + 4t) (d) X(t) = (3 + t, 3 + 3t, 3 + 2t) (e) X(t) = (1 + t, 3 + 3t, 1 + 2t) (f) X(t) = (2 + 3t, 3t, 1 + 3t) 6. Which one of the following equations describes the plane passing through the points (0, 0, 1), (1, 1, 1), and (2, 0, 0)? (a) x y + 2z = 2 (b) x y + z = 1 (c) x + 3y z = 4 (d) x y = 0 (e) z = 0 (f) x + y + z = 3 (g) x 2y + z = 2 (h) The three points are collinear and therefore do not uniquely determine a plane. 7. The vectors A, B, and C lie flat on the page and point in the directions indicated below. Each of the following answer choices lists three cross products involving A, B, and C. In which answer do all three of the cross products point in the upward direction? (a) A B, B C, and C A (b) A B, B C, and A C (c) A B, C B, and C A (d) A B, C B, and A C (e) B A, B C, and C A (f) B A, B C, and A C (g) B A, C B, and C A (h) B A, C B, and A C
4 Page 4 8. Let P = (2, 1, 0), Q = (0, 0, 1), R = ( 2, 1, 1), and S = (6, 3, 2). Three of these points are collinear (that is, there is a single line passing through all three points). Which three points are collinear? (a) P, Q, and R (b) P, Q, and S (c) P, R, and S (d) Q, R, and S 9. Which one of the following vectors is parallel to the line of intersection of the planes 2x+y+z = 6 and x + z = 0? (a) 2, 1, 1 (b) 1, 0, 1 (c) 3, 1, 2 (d) 3, 3, 3 (e) 6, 2, 1 (f) 1, 1, 1 (g) 0, 1, 0 (h) 2, 1, What is the shortest distance from the origin to the plane x + 2y + 2z = 5? (a) 0 (b) 1/5 (c) 1/3 (d) 1 (e) 5/3 (f) 3 (g) 2 (h) 5/2 (i) 5
5 Page What is the area of the triangle with vertices (0, 0, 1), (1, 1, 1), and (2, 3, 2)? (a) 1/2 (b) 2/2 (c) 3/2 (d) 1 (e) 2 (f) 3/2 (g) 3 (h) 2 (i) 5/2 (j) The motion of a particle is described by the parametric equation X(t) = t, t 2. How fast is the particle moving when t = 1? (a) 0 (b) 1 (c) 2 (d) 3 (e) 2 (f) 5 (g) 6 (h) 7 (i) Which one of the following equations describes the tangent line to the curve X(t) = (e t, 3t 2 + 2t) at the point (1, 0)? (a) L(t) = (1 + t, 2t) (b) L(t) = (1 + t, 8t) (c) L(t) = (1, 2t) (d) L(t) = (1, 8t) (e) L(t) = (1 + e t, 6t + 2) (f) L(t) = (1 + e, 2) (g) L(t) = (1 + et, 2t) (h) L(t) = (e t, 6t + 2)
6 Page A particle travels one time around the helix X(t) = (cos t, sin t, t) (that is, as t goes from 0 to 2π). What is the distance that the particle has traveled? (a) 1 (b) 2 (c) 2 (d) 2 2 (e) 2π (f) 4π (g) 2π + 1 (h) (2 2)π (i) 4π 15. The curve X(t) = (t 3 t, t 2 1) passes through the origin twice, when t = 1 and t = 1. What is the angle at which the curve crosses itself at the origin? (a) 0 (b) π/6 (c) π/4 (d) π/3 (e) π/2 (f) 2π/3 (g) 3π/4 (h) 5π/6 (i) π 16. Which one of the following Cartesian equations describes the parametric curve X(t) = (e 2t, e t )? (a) x 2 + y 2 = 1 (b) x 2 + 2y 2 = 1 (c) x + y = 2 (d) ln x = y (e) y = sin x (f) y = 2/x (g) y = x 2 (h) xy 2 = 1
7 Page Which one of the following functions is depicted in the contour plot below? (a) f(x, y) = x 2 + y 2 (b) f(x, y) = x + y 2 (c) f(x, y) = x y 2 (d) f(x, y) = x 2 + y (e) f(x, y) = x 2 y (f) f(x, y) = xy (g) f(x, y) = x 2 y 2 (h) f(x, y) = x/y (i) f(x, y) = x 2 + y In the following diagram, the vector d describes the displacement of a box. The vectors F, G, and H describe three different forces that act on the box as it moves in the direction of d. Which of the following statements is true? (a) The work done by F is greater than the work done by G. (b) The work done by H is greater than the work done by G. (c) All three forces do the same amount of work, and that amount is zero. (d) All three forces do the same amount of work, and that amount is negative. (e) All three forces do the same amount of work, and that amount is positive.
8 Page If the motion of a particle is described by a parametric curve X(t) = (x(t), y(t), z(t)), the speed of the particle is described by the function S(t) = X (t). Which of the following is a correct formula for S (t)? (a) S (t) = X (t) (b) S (t) = X(t) X (t) (c) S (t) = X (t) X (t) (d) S (t) = X (t) X (t) X (t) (e) S (t) = X(t) X (t) X (t) (f) S (t) = X (t) X (t) (g) S (t) = X (t) X (t) 20. The vectors A and B lie flat on the page and point in the directions indicated below. Which of the following statements is true? (a) A B = 0 (b) A B > 0 (c) A B < 0 (d) A B = O (e) A (A B) > 0 (f) A (A B) < 0
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