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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 Δ vectors = (5 m)ˆ ı + (2 m)ˆ + ( − 4 m) ˆ k along a straight line. During the displace- ment, a constant force of vector F = (6 N)ˆ ı + ( − 4 N)ˆ + (1 N) ˆ k acts on the object. Find the work done by vector F for this displace- ment. Correct answer: 18 J. Explanation: Let: Δ vectors = (5 m)ˆ ı + (2 m)ˆ + ( − 4 m) ˆ k and vector F = (6 N)ˆ ı + ( − 4 N)ˆ + (1 N) ˆ k . The work is W = vector F · Δ 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 · Δ vectors = vextenddouble vextenddouble vextenddouble vector F vextenddouble vextenddouble vextenddouble bardbl Δ vectors bardbl cos θ ....
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This note was uploaded on 02/24/2011 for the course PHYS 152 taught by Professor Button during the Winter '08 term at IUPUI.
- Winter '08