# Ch6 HW1 - Ch6 HW1...

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Ch6 HW1 (Homework) BRANDON JARROTT FELDKAMP PHYS 2211, section M, Fall 2008 Instructor: Jennifer Curtis Web Assign Current Score: 13 out of 13 Due: Wednesday, October 15, 2008 09:00 AM EDT Description Spring potential energy; interatomic potential energy Instructions Reading: Sections 6.1-6.2 Sections 6.7-6.10 The due date for this assignment is past. Your work can be viewed below, but no changes can be made. 1. [MI2 06.X.02] 4/4 points A horizontal spring with stiffness 0.5 N/m has a relaxed length of 11 cm ( 0.11 m). A mass of 23 grams ( 0.023 kg) is attached and you stretch the spring to a total length of 21 cm ( 0.21 m). The mass is then released from rest. What is the speed of the mass at the moment when the spring returns to its relaxed length of 11 cm ( 0.11 m)? v = .466 0.466 m/s Solution or Explanation E sys = W ext = 0 for the system of the spring + mass. So, K = – U s , and expanded further, m ( v f 2 - v i 2 ) = – k s ( s f 2 - s i 2 ). Solve for

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Ch6 HW1 - Ch6 HW1...

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