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Unformatted text preview: lai (yl8859) HW09 Ross (15200) 1 This print-out should have 7 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 (part 1 of 2) 10.0 points A 7 kg object is given a displacement vectors = (5 m) + (2 m) + ( 4 m) k along a straight line. During the displace- ment, a constant force of vector F = (6 N) + ( 4 N) + (1 N) k acts on the object. Find the work done by vector F for this displace- ment. Correct answer: 18 J. Explanation: Let: vectors = (5 m) + (2 m) + ( 4 m) k and vector F = (6 N) + ( 4 N) + (1 N) k . The work is W = vector F vectors = F x s x + F y s y + F y s z = (6 N) (5 m) + ( 4 N) (2 m) + (1 N) ( 4 m) = 18 J . 002 (part 2 of 2) 10.0 points Find the component of vector F in the direction of this displacement. Correct answer: 2 . 68328 N. Explanation: W = vector F vectors = vextenddouble vextenddouble vextenddouble vector F vextenddouble vextenddouble vextenddouble bardbl vectors bardbl cos ....
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- Winter '08