Vibrating a 75g Bungee Cord: Standing Wave Formation

AI Thread Summary
A 75 g bungee cord with an equilibrium length of 1.20 m is stretched to 1.80 m and vibrated at 20 Hz, creating a standing wave with two antinodes. The user attempts to calculate the spring constant 'k' using the equation w = sqrt(k/m) but is struggling to find the correct value. They initially calculated 'k' as 1184 N/m but suspect it may be incorrect, as they are getting values that are double and half of that. The urgency of the assignment due at 12:00 pm tomorrow adds pressure to resolve the issue. Assistance is sought to clarify the approach to the problem.
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Homework Statement


A 75 g bungee cord has an equilibrium length of 1.20 m. The cord is stretched to a length of 1.80 m, then vibrated at 20 Hz. This produces a standing wave with two antinodes.


Homework Equations


I really am not sure how to approach this using an equation, tried to use

w = sqrt (k/m)


The Attempt at a Solution



using the above equation I got a value of

1184 N/m for 'k', which is incorrect
 
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i'm getting now double of that, and half of that value, anyone have any ideas still? this assignment is due 12:00pm tomorrow for us
 

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