Standing waves hanging in pulley problem

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SUMMARY

The discussion focuses on the calculation of theoretical wave speed using the formula vtheo. = √(F_T/μ), where F_T represents tension and μ is the linear mass density. It highlights the oversight of not including the mass of the string hanging over the pulley, specifically a 20cm string with a 100-gram mass. The participants analyze the impact of this omission on the accuracy of wave velocity calculations and explore the relationship between sound velocity and string length.

PREREQUISITES
  • Understanding of wave mechanics and wave speed equations
  • Familiarity with linear mass density (μ) and its calculation
  • Knowledge of tension in strings and its effects on wave propagation
  • Basic principles of sound velocity and its dependence on medium properties
NEXT STEPS
  • Calculate the percentage error in wave velocity due to the omission of string mass
  • Explore the relationship between tension and wave speed in strings
  • Investigate the effects of varying string lengths on wave properties
  • Study the principles of sound velocity in different media
USEFUL FOR

Physics students, educators, and anyone interested in wave mechanics and the effects of mass on wave propagation in strings.

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In the calculation of the theoretical speed vtheo. = √(F_T/μ) (7), the mass associated with the length of the string hanging over the pulley was not taken into account. Suppose that the length of string hanging over the pulley is 20cm and that the hanging mass is 100 grams. What percentage error in the theoretical value of the wave velocity would result from ignoring the hanging string mass in this case?
 
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What is [tex]\mu[/tex]? (check the dimension).
Why would you expect sound velocity to be dependent on length?
 

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