Solving a Physics Problem: Transverse Wave Travel Time

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SUMMARY

The problem involves calculating the time for a transverse wave to travel the length of a rope with a suspended mass. The mass of the rope is 17 kg, and the length is 2.4 m, while the total mass being considered is 23 kg. The wave speed was calculated using the formula v = sqrt((mass of rope + mass of suspended mass) * gravity / linear mass density), resulting in a wave speed of approximately 7.44 m/s. The time for the wave to travel the rope was computed as 0.32 seconds, but the solution was identified as incorrect, indicating a need for a more thorough examination of tension distribution along the rope.

PREREQUISITES
  • Understanding of wave mechanics and transverse waves
  • Familiarity with algebra-based physics concepts
  • Knowledge of tension in strings and ropes
  • Basic calculus for analyzing variable tension
NEXT STEPS
  • Review the principles of wave propagation in strings and ropes
  • Learn about the effects of tension on wave speed in different mediums
  • Study the application of calculus in physics, particularly in tension analysis
  • Explore advanced topics in wave mechanics, such as wave reflection and transmission
USEFUL FOR

Students studying algebra-based physics, particularly those focusing on wave mechanics and tension in ropes, as well as educators seeking to clarify these concepts for their students.

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Homework Statement


Algebra based physics: A 23 kg mass is suspended from the bottom of a rope of length 2.4 m and mass 17 kg. The acceleration of gravity is 9.8 m/s^2.
Find time for a transverse wave to travel the length of the rope. Answer in units of sec.


Homework Equations


u= mass rope/ length rope
F=mg
v= d/t


The Attempt at a Solution


u= 17kg / 2.4m = 7.0833333

v= sqr (17+23)(9.8)/7.0833333
v= 7.439165039

t= d/v
t= 2.4m / 7.439165039
t= 0.322616851 s

This answer is wrong and I've had 2 tutors look over this but couldn't figure where the problem is.
 
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The mass of the rope is the medium the tension distributes across but it is not the source of the tension...although, if you want to be a bit more certain...you could use a bit of calculus to find the tension at various parts of the rope (it does change along its length...but you probably don't need to take this into account).
 
Last edited:

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