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# HW17 - Thevalingam Donald Homework 17 Due midnight Inst...

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Thevalingam, Donald – Homework 17 – Due: Jan 29 2007, midnight – Inst: Eslami 1 This print-out should have 13 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. 001 (part 1 of 1) 10 points It takes 4 . 19 J of work to stretch a Hooke’s-law spring 13 cm from its unstressed length. How much the extra work is required to stretch it an additional 7 . 91 cm? Answer in units of J. 002 (part 1 of 2) 10 points The force required to stretch a Hooke’s-law spring varies from 0 N to 78 . 3 N as we stretch the spring by moving one end 13 . 9 cm from its unstressed position. Find the force constant of the spring. An- swer in units of N / m. 003 (part 2 of 2) 10 points Find the work done in stretching the spring. Answer in units of J. 004 (part 1 of 1) 10 points A robot arm that controls the position of a video camera in an automated surveillance system is manipulated by a servo motor that exerts a force on a push-rod.

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