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A close-coifed helical spring of stiffness 4 N/mm is in series with another spring of stiffness 6 N/mm. What is the stiffness of composite spring?
  • a)
    5 N/mm
  • b)
    4 N/mm
  • c)
    2.4 N/mm 
  • d)
    None of these
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
A close-coifed helical spring of stiffness 4 N/mm is in series with an...
Let the stiffness of composite spring = k
∴ 
∴ 
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A close-coifed helical spring of stiffness 4 N/mm is in series with another spring of stiffness 6 N/mm. What is the stiffness of composite spring?a)5 N/mmb)4 N/mmc)2.4 N/mmd)None of theseCorrect answer is option 'C'. Can you explain this answer?
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