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# Math 281 HW 2

Course Number: MATH 281, Fall 2008

College/University: Oregon

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828 1111 CHAPTER I 3 VECTORS AND THE GEOMETRY OF SPACE 1 1 1= 7 torque vector is lr x Fl = )rlIF(sinO where 6 is the angle between the position and force vectors. Observe that the only component of F that can cause a rotation is the one perpendicular to r, that is, I F sin 6. The magnitude of the torque is equal to the area of the parallelogram determined by r and F. I EXAMPLE 6 A bolt is tightened by...

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I 828 1111 CHAPTER 3 VECTORS AND THE GEOMETRY OF SPACE 1 1 1= 7 torque vector is lr x Fl = )rlIF(sinO where 6 is the angle between the position and force vectors. Observe that the only component of F that can cause a rotation is the one perpendicular to r, that is, I F sin 6. The magnitude of the torque is equal to the area of the parallelogram determined by r and F. I EXAMPLE 6 A bolt is tightened by applying a 40-N force to a 0.25-m wrench as shown / in Figure 5. Find the magnitude of the torque about the center of the bolt. SOLUTION The magnitude of the torque vector is / / 1 T 1 = 1 r X F ( = ( r 1 1 F I sin 75" = (0.25)(40) sin 75" = 10 sin 75" . = 9.66 N-m If the bolt is right-threaded, then the torque vector itself is I FIGURE 5 where n is a unit vector directed down into the page. 1-7 Find the cross product a X b and verify that it is orthogonal to both a and b. 14-15 Find 1 u X v I and determine whether u X v is directed into the page or out of the page. 2. a = ( I , I , - I ) , 3. a = i + 3 j - 2k, 4. a = j + 7 k , b = (2,4,6) b = -i + 5 k b=2i-j+4k b=fi+j+fk b = 2 i + e'j -e-'k (1,2t, 3r2) S.a=i-j-k, 6. a = i + e ' j + e-'k, (t, t2, t 3 ) , b = 116.1 The figure shows a vector a in the xy-plane and a vector b in a = the direction of k. Their lengths are I a I = 3 and I b I = 2. (a) Find 1 a X b 1. (b) Use the right-hand rule to decide whether the components of a X b are positive, negative, or 0. 8. If a = i - 2 k and b = j + k, find a X b. Sketch a, b, and a X b as vectors starting at the origin. 9-12 Find the vector, not with determinants, but by using properties of cross products. 9. ( i X j ) X k 11. ( j - k) X ( k - i ) lo. k X (i - 2 j ) 12. (i + j) X (i - j) State whether each expression is meaningful. If not, explain why. If so, state whether it is a vector or a scalar. (b) a X (b c) (a) a (b X c) (c) a X (b X c) (d) (a b) X c (e) (a b) X (c d) ( f ) (a X b ) . (c X d) 17. I f a . = ( 1 , 2 , I ) and b = (0, l , 3 ) , f i n d a X b a n d b X a. - 18. I f a = ( 3 , 1 , 2 ) , b = (-1, l , O ) , a n d c = (0,0,-4),show that a X (b X c) # (a x b) x c. . 119.1 Find two unit vectors orthogonal to both ( I, - I , 1 ) and (0,4,4). SECTION 13.4 THE CROSS PRODUCT 1111 829 20. Find two unit vectors orthogonal to both i and 2i I + k. +j + k 40. Find the magnitude of the torque about P if a 36-lb force is applied as shown. 21. Show that 0 X a = 0 b = a X 0 for any vector a in V 3 . 0 for all vectors a and b in V 3 . 22. Show that (a X b) = 23. Prove Property I of Theorem 8. 24. Prove Property 2 of Theorem 8. 25. Prove Property 3 of Theorem 8. 26. Prove Property 4 of Theorem 8. 27. Find the area of the parallelogram with vertices A(-2, I), B(O,4), C(4,2), and D(2, - I). 28. Find the area of the parallelogram with vertices K(l, 2,3), L(1,3,6), M(3,8,6), and N(3,7,3). 29-32 (a) Find a nonzero vector orthogonal to the plane through 41. A wrench 30 cm long lies along the positive y-axis and grips a bolt at the origin. A force is applied in the direction (0.3, -4) at the end of the wrench. Find the magnitude of the force needed to supply 100 N.m of torque to the bolt. 42. Let v = 5 j and let u be a vector with length 3 that starts at the origin and rotates in the xy-plane. Find the maximum and minimum values of the length of the vector u X v. In what direction does u X v point? the points P, Q, and R, and (b) find the area of triangle PQR. m P(1,0,0), 30. P(2, P(0, -2, O), Q(0,2,0), R(0,0,3) Q(- 1,3,4), R(3,0,6) Q(4, 1, -21, R(5.3, 1) R(4,3, - 1) 143.1 (a) Let P be a point not on the line L that passes through the points Q and R. Show that the distance d from the point P to the line L is I 32. P(- 1,3, 11, Q(0,5,2), 33-34 Find the volume of the parallelepiped determined by the vectors a, b, and c. 33.a=(6,3,-I), 34.a=i+j-k, b=(0,1,2), b=i-j+k, c=(4,-2,5) c=-i+j+.k -+ + where a = QR and b = QP. (b) Use the formula in part (a) to find the distance from the point P(1, 1, 1) to the line through Q(0, 6y8) and R(-1,4,7). 44. (a) Let P be a point not on the plane that passes through the points Q, R, and S. Show that the distance d from P to the plane is I(a x b) . c l d= laxbl + + + where a = QR, b = QS, and c = QP. (b) Use the formula in part (a) to find the distance from the point P(2, 1,4) to the plane through the points Q(l, 0, O), R(O,2, O), and S(0, 0, 3). 35-36 Find the volume of the parallelepiped with adjacent edges PQ, PR, and PS. 35. P(2,0, -11, 36. P(3,0, l), - Q(4, 1.01, - R(3, -1, l), \$2, -2,2) S(0,4,2) - Q(- 1,2,5), R(5, 1, -I), 1 Use the 5 .ar triiple u =: i - 2 k, v are coplanar. + verify thalt the v and w = 5 i + 1 38. Use the scalar triple product to determine whether the points 145.1 Prove that (a - b) X (a + b) = 2(a X b). 46. Prove Property 6 of Theorem 8, that is, a X (b X c) = A(l,3,2), B(3, -l,6), C(5,2, O), and D(3,6; -4) lie in the same plane. 39. A bicycle pedal is pushed by a foot with a 60-N force as shown. The shaft of the pedal is 18 cm long. Find the magnitude of the torque about P. ( a . c ) b - ( a . b)c 47. Use Exercise 46 to prove that 48. Prove that Suppose that a # 0. (a) If a . b = a c, does it follow that b = c? 838 1111 CHAPTER I 3 VECTORS AND THE GEOMETRY OF SPACE 13.5 EXERCISES 16. (a) Find parametric equations for the line through (2,4,6) that I. Determine whether each statement is true or false. (a) Two lines parallel to a third line are parallel. (b) Two lines perpendicular to a third line are parallel. (c) Two planes parallel to a third plane are parallel. (d) Two planes perpendicular to a third plane are parallel. (e) 'Tbo lines parallel to a plane are parallel. ( f ) Two lines perpendicular to a plane are parallel. (g) Two planes parallel to a line are parallel. (h) Two planes perpendicular to a line are parallel. (i) l b o planes either intersect or are parallel. (j) Two lines either intersect or are parallel. (k) A plane and a line either intersect are or parallel. 2-5 Find a vector equation and parametric equations for the line. 2. The line through the point (6, -5,2) and parallel to the is perpendicular to the plane x planes? -y + 32 = 7. (b) In what points does this line intersect the coordinate 17. Find a vector equation for the line segment from (2, to (4,6, 1). -l,4) 18. Find parametric equations for the line segment from (10,3, 1) to (5,6, -3). 19-22 Determine whether the lines Ll and L2 are parallel, skew, or intersecting. If they intersect, find the point of intersection. 119./ L I : x = -6t, y = 1 + 9t, z = -3t vector (1,3, -f) 3. The line through the point (2,2.4,3.5) and parallel to the vector3i 2 j - k + 4. The line through the point (0, 14, - 10) and parallel to the line x=-1 +2t,y=6-3t,z=3+9t 22. L,: The line through the point ( l , 0 , 6 ) and perpendicular to the plane x + 3y + z = 5 6-12 Find parametric equations and symmetric equations for the -=-- x-1 2 y-3 2 2-2 -1 line. 6. The line through the origin and the point (1,2,3) 7. The line through the points (1,3,2) and (-4,3,0) 8. The line through the points (6, 1, -3) and (2,4,5) 23-38 Find an equation of the plane. 23. The plane through the point (6, 3,2) and perpendicular to the vector (-2, 1 , s ) 24. The plane through the point (4,0, -3) and with normal vector j + 2 k The line through the points (0, f , 1) and (2, 1, -3) 10. The line through (2, 1,O) and perpendicular to both i and j k + +j 25. The plane through the point (I, -1, 1) and with normal vector i j - k + I I. The line through (1, - 1, 1) and parallel to the line x+2=fy=z-3 12. The line of intersection of the planes x 26. The plane through the point (-2, 8, 10) and perpendicular to the line x = 1 r, y = 2t, z = 4 - 3r +y +z = 1 + andx+ z =0 27. The plane through the origin and parallel to the plane 2x-y+3z=1 28. The plane through the point (- 1,6, -5) and parallel to the 113.1 Is the line through (-4, -6, 1) and (-2,0 -3) parallel to the line through (10, 18,4) and (5,3, 14)? planex+ y + z 3x-7z= 12 +2 = 0 14. Is the line through (4, 1, - 1) and (2,5,3) perpendicular to the 29. The plane through the point (4, -2.3) and parallel to the plane 30. The plane that contains the line x = 3 line through (-3,2,0) and (5, 1,4)? 15. (a) Find symmetric equations for the line that passes through and is parallel to the plane 2 x the point (1, -5,6) and is parallel to the vector (-1,2, -3). (b) Find the points in which the required line in part (a) intersects the coordinate planes. + 4y + 82 = 17 + 2t, y = t, z = 8 - t ~Theplanethroughthepoints(O,1,1),(1,0,1),and(1,1,0) 32. The plane through the origin and the points (2, -4.6) and (5, 1,3) i SECTION 13.5 EQUATIONS OF LINES AND PLANES 1111 839 57-58 Find symmetric equations for the line of intersection of the planes. 34. The plane that passes through the point (1,2, 3) and contains the line x = 3t, y = 1 + t, z = 2 - t 35. The plane that passes through the point (6,0, -2) and contains the line x = 4 - 2t, y = 3 5t, z = 7 4 t 57. 5x - 2y - 22 = 1, 4x +y +z =6 + + I 36. The plane that passes through the point (1, - 1, 1) and contains the line with symmetric equations x = 2y = 32 37. The plane that passes through the point (- 1,2, 1) and contains the line of intersection of the planes x y - z = 2 and 2x-y+3z=1 59. Find an equation for the plane consisting of all points that are equidistant from the points (1,0, -2) and (3,4,0). 60. Find an equation for the plane consisting of all points that are equidistant from the points (2,5, 5) and (-6, 3, 1). + 161.1 Find an equation of the plane with x-intercept a, y-intercept b, and z-intercept c. 62. (a) Find the point at which the given lines intersect: 38. The plane that passes through the line of intersection of the planes x - z = 1 and y + 2.7 = 3 and is perpendicular to the plane x y - 22 = 1 + 39-42 Use intercepts to help sketch the plane. + 5y + z = 10 41. 6x - 3y + 42 = 6 39. 2x 40. 3x 42. 6x + y + 2.2 = 6 (b) Find an equation of the plane that contains these lines. 63. Find parametric equations for the line through the point (0, 1,2) that is parallel to the plane x y z = 2 and perpendicular to the line x = 1 t, y = 1 - t, z = 2t. + 5y - 32 = 15 + ++ 43-45 Find the point at which the line intersects the given plane. 43.x=3-t, y = 2 + t , z=5t; x-y+2z=9 x+2y-z+l=O 64. Find parametric equations for the line through the point (0, 1, 2) that is perpendicular to the line x = 1 + t, y = 1 - t, z = 2t and intersects this line. 65. Which of the following four planes are parallel? Are any of them identical? 44.x=1 +2t, y = 4 t , z = 2 - 3 t ; 45.x=y-1=2z; 4x-y+3z=8 46. Where does the line through (1,0, 1) and (4, -2.2) intersect the plane x + y + z = 6 ? 47. Find direction numbers for the line of intersection of the planes x + y + z = landx+z=O. 48. Find the cosine of the angle between the planes x a n d x + 2y + 3 z = 1. 66. Which of the following four lines are parallel? Are any of them identical? L,: x = l + t , y=t, z=2-5t +y +z =0 4 : x + 1=y-2=1-z L3:x=I+t, L4: r = 49-54 Determine whether the planes are parallel, perpendicular, or neither. If neither, find the angle between them. m ~ + 4 ~ - 3I , ~ -=~ x + ~ Y + ~ z = o 50. 22 = 4y y=4+t, z=1-t (2, 1, -3) + t(2,2, -10) - x, 3x - 12y + 62 x-y+z=l x = 1 67-68 Use the formula in Exercise 43 in Section 13.4 to find the distance from the point to the given line. 51.x+y+z=l, 52. 2x - 3y 53. x 54. x = 4y + 42 = 5, + 6y + 4.2 = 3 - 2.7, 8y = 1 2x + 2x + 42 - y + 22 = 1 69-70 Find the distance from the point to the given plane. 69. (1, -2,4), 3x + 2y + 22 = 1, + 2y + 62 = 5 = 55-56 (a) Find parametric equations for the line of intersection of the planes and (b) find the angle between the planes. 55.x+y+z=l, 56. 3 x - 2 y + z = 70. (-6,3,5), x - 2y - 42 8 x+2y+2z=1 1, 2 x + y - 3 z = 3 71-72 Find the distance between the given parallel planes. 71. 2 x - 3 y + z = 4 , 4x-6y+2z=3

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JER SOLUTION CUSTOMER COSTS WITH THE JER SAW 30,000 JOIST LIFE/180 JOIST PER JOB = 167 JOB LIFE 167 JOBS X 2 PROGRAMMING HOURS PER JOB = 334 HOURS 30,000 JOIST LIFE/15 JOIST PER HOUR = 2,000 HOURS 2,334 X \$21 PER HOUR WAGES = \$49,014 CURRENT CUSTOMER
Oregon - BA - 612
Abba Robotics Inc. Solution1. Total and net economic value to Positive financial changes per year 3 workers replaced @ 50,000 each Flange damage reduction (.1 x 50,000 x .8 x (40 + 100) Price increase (.05 x 50,000/10 x 2,000) TOTAL benefits Negativ
Oregon - BA - 612
AMERICANSEPTICSYSTEMSCUSTOMERVALUENEWNONPRICE1YEARCOSTS PLUMBER TOTAL CURRENTONEYEARCOSTS PLUMBER(\$120X2) DRAINFIELD(\$3,600/3) DEGREASER(200,000/40,000)X12X\$10) TOTAL \$240 1,200 600 \$2,040 \$120 \$120TOTALECONOMICSAVINGS=\$2,040\$120 EVCPERPOUND=\$1,92
Oregon - BA - 612
Practice marketing decisions 1. 2. 3. 4. 5. 5% 2. 40%, 66.7% .6% 3.3% 23.54; 31.19Practice value TO problems 1. \$325,000 2. \$11,000; \$10,700 Price is too low Prototype exam 1. 4% 2. \$6,400; \$1,900 3. \$15,000
Oregon - BA - 716
Northwest Chapter NewsletterWinter 2003/04 Think Twice Before Jumping on the Low Carbohydrate Bandwagonby Katherine A. Beals, Ph.D., R.D.Its hard not to be tempted to try it. Youve heard testimonials touting it. Youve read magazine articles suppor
Oregon - MUS - 199
Ryan Wiggans Tuesday, April 19, 2005 ALS 199 Paper 3: TimeIve always had a problem with managing time. I am the essence of procrastination. Getting things done at or past the last minute has become a habitual practice for me; a practice that I nee
Oregon - MUS - 358
Ryan Wiggans 11/17/05 Response 51.One musical role is the skeletal melody which is the prominent section that centers the other parts and is usually played on the slenthem, which is made up of suspended metal keys which are hit with mallets. Anot
Oregon - BE - 325
FolkvineCultureWork: Current IssueHome / Research &amp; Publications / CultureWork / Current Issueclick here to visit Folkvine.org &gt;Folkvine.org: The Challenges of Presenting Folk Art On-line. An Overviewby Kristin G. Congdon Director, Heritage A
Oregon - BE - 410
Oregon - BE - 410
Physics 410 Midterm Practice Exam Fall 2007, Frey Closed book exam. No calculators. There are 6 practice problems. The actual exam will have no more than 5.1. (15 points) Using the denition of matrix multiplication, show that (AB) = B A .2. (25 p
Oregon - BE - 510
ENVS 410/510; PHIL 407Fall 2003Environmental EthicsMW 12:00 - 1:50, Allen 216 Instructor: Office Hours: Phone: Email: GTFs: Dr. Ted Toadvine MW 9:00 - 11:00 and by appointment, PLC 319 346-5554 (office); 346-5547 (Philosophy Office Manager) toad
Oregon - BE - 510
EverymanReturn to Renascence EditionsEVERYMAN. (John Skot, 1521-1537?)Note on the e-text: this Renascence Editions text is based on the edition by W.W. Greg, 1904. It was transcribed by R.S. Bear. Formatting of the speakers has been modified for
Oregon - BE - 610
ENVS 610: Environmental Studies in Theory &amp; Practice 2:00 - 3:50 MW, 301A AllenTed Toadvine, toadvine@uoregon.edu Office: PLC 319, 346-5554 Hours: 10:00 - 11:00 MW and by appt.Fall 2007 CRN: 11977Course Description: This course is the first segm
Oregon - BE - 610
ENVS 610: Environmental Studies in Theory &amp; Practice 12:00 - 1:50 MW, 206 Friendly HallTed Toadvine, toadvine@uoregon.edu Office: PLC 319, 346-5554 Hours: 2:00 - 3:00 M WFall 2006 CRN: 17492Course Description: This course is the first segment of
Oregon - BI - 211
\server05\productn\O\OEL\21-1\OEL105.txtunknownSeq: 110-JAN-0712:00NOTES &amp; COMMENTSMATTHEW F. JAKSA*Putting the Sustainable Back in Sustainable Development: Recognizing and Enforcing Indigenous Property Rights as a Pathway to Global Envi