EC Mast gPh Hwo7 ork and Energy Google Chrome https:// mastering physics.com 586

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EC Mast gPh Hwo7 ork and Energy Google Chrome https:// mastering physics.com 58678758&offset; next ASU PHY 111 Spring 2016 10577 HW07 Work and Energy Problem 7.26 Problem 7.26 Part A A spring is 16.6 cm long when it is lying on a table. One end What is the force constant of this spring? is then attached to a hook and the other end is pulled by a force that increases to 25.0 N, causing the spring to stretch to a length of 19.2 cm k 1136 N/m Submit My Answers Give U Incorrect, Try Again, 9 attempts remaining Part B How much work was required to stretch the spring from 16.6 cm to 19.2 cm Submit My Answers Give Up Part C How long will the spring be if the 25.0 N force is replaced by a 50.0 N force? Close Resources previous l 4 of 11 l next

Explanation / Answer

Part a) k(xf-xi)=25

K=25/(0.192-0.166)=961.54N/m

Part b)Work done=(0.5kxf2-0.5kxi2)=0.5*961.54(0.192-0.166)2=0.325Nm

Part c)

k(xf-xi)=50

xf=(50/k)+xi=0.052+0.166=0.218m=21.8cm

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