Ch6 HW1 - WebAssign Ch6 HW1(Homework Current Score 7.8 out...

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Ch6 HW1 (Homework) Arthur Barfield PHYS 2211, section M, Fall 2008 Instructor: Jennifer Curtis Web Assign Current Score: 7.8 out of 13 Due: Thursday, October 16, 2008 11:41 PM 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 0.7 N/m has a relaxed length of 13 cm ( 0.13 m). A mass of 21 grams ( 0.021 kg) is attached and you stretch the spring to a total length of 22 cm ( 0.22 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 13 cm ( 0.13 m)? v = .5196 0.52 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 v f . Remember that s is the stretch of the spring, not its length: s = L – L 0 . Also, one must convert centimeters to meters and grams to kilograms.

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