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# Ch4 HW1 - Ch4 HW1...

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Ch4 HW1 (Homework) BRANDON JARROTT FELDKAMP PHYS 2211, section M, Fall 2008 Instructor: Jennifer Curtis Web Assign Current Score: 38 out of 39 Due: Monday, September 15, 2008 09:00 AM EDT Description Stiffness of interatomic bond; Young's modulus; compression forces Note that the multiple-choice question has only one submission, so think carefully. Instructions Reading: Sec. 4.5-4.7 The due date for this assignment is past. Your work can be viewed below, but no changes can be made. 1. [MI2e 4.X.3a] 2/2 points You hang a mass M from a spring, which stretches an amount 16 mm. Then you cut the spring in half and hang the same mass M from one half. How much does the half-length spring stretch? stretch = 8 8 mm A spring has stiffness 60 N/m. You cut the spring in half. What is the stiffness of the half-length spring? k s = 120 120 N/m 2. [MI2 04.X.03] 2/2 points If a chain of 40 identical short springs linked end-to-end has a stiffness of 260 N/m, what is the stiffness of one short spring? k s = 260*40 10400 N/m 3. [MI2 04.X.04] 2/2 points 30 identical springs are placed side-by-side (in parallel), and connected to a large massive block. The stiffness of the 30 -spring combination is 13500 N/m. What is the stiffness of one of the individual springs? k s = 13500/30 450 N/m Ch4 HW1 http://www.webassign.net/[email protected]/student.pl?w=2008. .. 1 of 5 11/18/2008 6:20 PM

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Solution or Explanation N side-by-side (parallel) springs, each stretched the same amount s , exert a total force N*k s *s , so effectively they act like a single spring of stiffness N*k s . One spring has 1/ N the stiffness of the combination. 4. [MI2 04.X.05.01] 2/2 points
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Ch4 HW1 - Ch4 HW1...

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