5/10/12 9:42 PMSection 9.3Page 1 of 2http://www.webassign.net/web/Student/Assignment-Responses/view_key?dep=3769811Current Score : 19.5 / 19.5 Due : Wednesday, February 1 2012 11:02 PM EST1. 2/2 points | Previous AnswersFind the dot product of two vectors if their lengths are 7 and 1/5 and the angle between them is !/4.0.98 0.992. 2/2 points | Previous AnswersFind a·b.a = (1/6, 8)b = (-7, -3)-25.166 -25.23. 2/2 points | Previous AnswersFind a·b.a = (s, 5s, 6s)b = (t, -t, 7t) 4. 2/2 points | Previous AnswersIf u is a unit vector, find u·v and u·w.u·v = 0.5 0.5 u·w = 0 0Section 9.3 (Homework)Ali Al ZaabiMA 242, section 001, Spring 2012Instructor: J. Louis CappsWebAssignThe due date for this assignment is past. Your work can be viewed below, but no changes can be made.5/10/12 9:42 PMSection 9.3Page 2 of 2http://www.webassign.net/web/Student/Assignment-Responses/view_key?dep=37698115. 2/2 points | Previous AnswersFind the angle between the vectors. (First find an exact expression and then approximate to the nearestdegree.)a = (6, -3, 2)b = (2, 1, -2)76 76 °6. 3.5/3.5 points | Previous AnswersFind the scalar and vector projections of b onto a.a = 2i - 3j + k, b = i + 6j - 2kScalar projection-4.81 -4.81 Vector projection-2.57 -2.57 i + 3.86 3.86 j + -1.29 -1.29 k7. 3/3 points | Previous AnswersFind the work done by a force of 29 lb acting in the direction N50°W in moving an object 7 ft due west.155.5 156 ft-lb8. 3/3 points | Previous AnswersA wagon is pulled a distance of 110 m along a horizontal path by a constant force of 55 N. The handle ofthe wagon is held at an angel of 30° above the horizontal. How much work is done?5239.4 5240
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