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ch 7 hw 1

# ch 7 hw 1 - The due date for this assignment is past Your...

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Web Assign Ch7 HW1 f10 (Homework) Ashlyn Baum Physics 303K, section B, Fall 2010 Instructor: Jim Chelikowsky Current Score : 7 / 7 Due : Wednesday, October 27, 2010 11:30 PM CDT 1. 1/1 points Question: MI3 7.1.X.025 2. 1/1 points Question: MI3 7.1.X.022 A spring has a relaxed length of 8 cm and a stiffness of 150 N/m. How much work must you do to change its length from 13 cm to 16 cm? 0.2925 N·m 3. 1/1 points Question: MI3 7.1.X.002 A horizontal spring with stiffness 0.5 N/m has a relaxed length of 19 cm ( 0.19 m). A mass of 18 grams ( 0.018 kg) is attached and you stretch the spring to a total length of 29 cm ( 0.29 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 19 cm ( 0.19 m)? v = 0.527 m/s 4. 4/4 points Question: MI3 7.2.P.032 The figure shows a potential energy curve for the interaction of two neutral atoms. The two- atom system is in a vibrational state indicated by the heavy solid horizontal line.

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Unformatted text preview: The due date for this assignment is past. Your work can be viewed below, but no changes can be made. View Key A spring whose stiffness is 1110 N/m has a relaxed length of 0.57 m. If the length of the spring changes from 0.32 m to 0.88 m, what is the change in the potential energy of the spring? Δ U = 18.648 J Page 1 of 2 Ch7 HW1 f10 11/21/2010 http://www.webassign.net/[email protected]/[email protected] .. (a) At r = r 1 , what are the approximate values of the kinetic energy K , the potential energy U , and the quantity K + U ? K = 1.1 eV U = -1.3 eV K + U = -.2 eV (b) What minimum (positive) amount of energy must be supplied to cause these two atoms to separate? .2 eV Page 2 of 2 Ch7 HW1 f10 11/21/2010 http://www.webassign.net/[email protected]/[email protected] .....
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