MATH 209 Practice Exam #1
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Department of Mathematics
MATH 209
Practice Exam #1
1. [10 points] Identify the center and radius for the following sphere:
x2 + y2 + z2 - 6x + 8z = 0.
2. [20 points] Given u = (1, 0, -3) , v = (2, -2, 1) , w = 3i - 2j + k. Find the following. (a) 2u - 3v.
(b) The angle between u and v to the nearest degree.
(c) A vector in the direction of v with norm 6.
(d) The volume of the solid whose edges are u, v, and w.
3. [20 points] Given points A(1, 0, -1), B(1, 1, -2), and C(0, 3, -2). (a) Find the parametric equations of the line passing B and C . (b) Find the general equation of the plane passing A, B, and C .
(c) What is the point of intersection of the plane in part (b) with the z-axis?
(d) The area of triangle ABC .
4. [10 points] Given a motion represented by r(t) = ti + 2tj + e –2tk. (a) Find the initial velocity and speed at t = 0.
(b) Find the acceleration.
5. [15 points] Given surface equation 9z2 = 4x2 + y2 in the space.
(a) Find the traces of the surface intersecting xy-plane, xz-plane, and the plane z = ±4 and sketch the surface.
(b) What is the name of this quadric surface?
6. [25 points] Given a motion represented by a vector-valued function r(t) such that
r\ (t) = -4ti + 2tj + tk, r(0) = -k.
(a) Find r.
(b) Find the unit tangent vector T at t = 1.
(c) Find the arc length of the curve between t = 1 and t = 2.
(d) Find the curvature at t = 1.
(e) Describe the trace of the motion.
2023-01-10