Checkpoint
No, the triple scalar product is −4≠0, so the three vectors form the adjacent edges of a parallelepiped. They are not coplanar.
Possible set of parametric equations: x=1+4t,y=−3+t,z=2+6t;
related set of symmetric equations: x−14=y+3=z−26
These lines are skew because their direction vectors are not parallel and there is no point (x,y,z) that lies on both lines.
The traces parallel to the xy-plane are ellipses and the traces parallel to the xz- and yz-planes are hyperbolas. Specifically, the trace in the xy-plane is ellipse x232+y222=1, the trace in the xz-plane is hyperbola x232−z252=1, and the trace in the yz-plane is hyperbola y222−z252=1 (see the following figure).
a. This is the set of all points 13 units from the origin. This set forms a sphere with radius 13. b. This set of points forms a half plane. The angle between the half plane and the positive x-axis is θ=2π3. c. Let P be a point on this surface. The position vector of this point forms an angle of φ=π4 with the positive z-axis, which means that points closer to the origin are closer to the axis. These points form a half-cone.
Spherical coordinates with the origin located at the center of the earth, the z-axis aligned with the North Pole, and the x-axis aligned with the prime meridian
Section 2.1 Exercises
a. a+b=3i+4j, a+b=〈3,4〉; b. a−b=i−2j, a−b=〈1,−2〉; c. Answers will vary; d. 2a=4i+2j, 2a=〈4,2〉, −b=−i−3j, −b=〈−1,−3〉, 2a−b=3i−j, 2a−b=〈3,−1〉
The two horizontal and vertical components of the force of tension are 28 lb and 42 lb, respectively.
Section 2.2 Exercises
A union of two planes: y=5 (a plane parallel to the xz-plane) and z=6 (a plane parallel to the xy-plane)
a. F=−294k N; b. F1=〈−49√33,49,−98〉, F2=〈−49√33,−49,−98〉, and F3=〈98√33,0,−98〉 (each component is expressed in newtons)
a. v(1)=〈−0.84,0.54,2〉 (each component is expressed in centimeters per second); ‖v(1)‖=2.24 (expressed in centimeters per second); a(1)=〈−0.54,−0.84,0〉 (each component expressed in centimeters per second squared);
b.
Section 2.3 Exercises
Section 2.4 Exercises
Section 2.5 Exercises
a. b. For instance, the line passing through with direction vector c. For instance, the line passing through and point that belongs to is a line that intersects;
a. b. c.
Answers may vary by a sign, depending on how the vector cross multiplication is performed.
Section 2.6 Exercises
a.
b.
;
c. The intersection curve is the ellipse of equation and the intersection is an ellipse.; d. The intersection curve is the ellipse of equation
Section 2.7 Exercises
Review Exercises
trace: is a circle, trace: is a hyperbola (or a pair of lines if trace: is a hyperbola (or a pair of lines if The surface is a cone.