# HW 9 - HW 9 R e be cca P a tton P Y211,se ction001,S umme...

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6/3/13 HW 9 www.webassign.net/web/Student/Assignment-Responses/submit?dep=5935421 1/4 Current Score : 3 / 18 Due : Tuesday, June 4 2013 11:59 PM EDT 1. 3/3 points | Previous Answers SerCP9 5.P.020. When a 2.80 ­kg object is hung vertically on a certain light spring described by Hooke's law, the spring stretches 3.22 cm. (a) What is the force constant of the spring? 852.2 N/m (b) If the 2.80 ­kg object is removed, how far will the spring stretch if a 1.40 ­kg block is hung on it? 1.61 cm (c) How much work must an external agent do to stretch the same spring 7.10 cm from its unstretched position? 2.15 J 2. 0/2 points | Previous Answers SerCP9 5.P.023.MI.FB. A 2,300 ­kg pile driver is used to drive a steel I­beam into the ground. The pile driver falls 4.40 m before coming into contact with the top of the beam, and it drives the beam 15.4 cm farther into the ground as it comes to rest. Using energy considerations, calculate the average force the beam exerts on the pile driver while the pile driver is brought to rest.

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