Dependence of extention on length

  • #1
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Homework Statement


A light uniform spring is tied between the ceiling and the floor keeping the spring vertical as shown in the figure. A bead of finite mass is glued at a distance l from the upper end and then allowed to go slowly down. The bead shifts a distance y.How does the y depend on l?


The Attempt at a Solution




I put that k(change in length of the spring upper part) +k ( change in legth of the lower part)=mg
And that both changes are same thus the changes in legth =(mgk)/2. But the answer says its wrong.
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Answers and Replies

  • #2
Orodruin
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The spring constant of a partial spring is not the same as the spring constant of the full spring.
 
  • #3
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The spring constant of a partial spring is not the same as the spring constant of the full spring.
Thanks you so much!!!
 

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