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An object weighing 0.60N is hung on a spiral spring and caused it to extend...

Physics
NECO 2002

An object weighing 0.60N is hung on a spiral spring and caused it to extend by 6.0cm. The object is removed and a black of wood replacing it causes the spring to extend by 10.0cm. What is the weight of the block of wood?

  • A. 0.10N
  • B. 0.36N
  • C. 0.80N
  • D. 1.00N
  • E. 3.60N
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Correct Answer: Option D
Explanation

From Hooke's law... F = ke

From the first statement 

0.6 = k x 0.06

k = \(\frac{0.6}{0.06}\) = 10N/m

From second statement

F = weight of the block = ke

F = 10 x 0.1 = 1.0N

NOTE: Extension (cm → m) 


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