You have a light spring which obeys Hooke's law. This spring stretches 2.78 cm vertically when a 2.40 kg object is suspended from it. Determine the following. 1. the force constant of the spring (in N/m)   2.the distance (in cm) the spring stretches if you replace the 2.40 kg object with a 1.20 kg object   3.the amount of work (in J) an external agent must do to stretch the spring 8.90 cm from its unstretched position

Physics for Scientists and Engineers: Foundations and Connections
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Author:Katz, Debora M.
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Chapter9: Energy In Nonisolated Systems
Section: Chapter Questions
Problem 39PQ: A shopper weighs 3.00 kg of apples on a supermarket scale whose spring obeys Hookes law and notes...
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You have a light spring which obeys Hooke's law. This spring stretches 2.78 cm vertically when a 2.40 kg object is suspended from it. Determine the following.

1. the force constant of the spring (in N/m)
 
2.the distance (in cm) the spring stretches if you replace the 2.40 kg object with a 1.20 kg object
 
3.the amount of work (in J) an external agent must do to stretch the spring 8.90 cm from its unstretched position

 

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