Mass matters for standing waves on a string?

AI Thread Summary
The discussion centers on the dynamics of a massless string with a small ball of mass m attached to it. The equation of motion A cos(Wt) is analyzed, with terms defined to understand the system's behavior. There is uncertainty about whether the presence of the ball affects the string's motion. Participants are encouraged to present their best attempts at solving the problem for further assistance. The conversation highlights the importance of understanding the implications of mass in wave equations.
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Homework Statement
Does the equation of motion of a standing wave get impacted when a mass is attached to the string?
Relevant Equations
y = A cos(Wt)
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The question is to explain the equation of motion of the red ball. The string is massless and a small ball of mass m is attached to the string halfway. I just assumed the mass of the string is the same as the mass of the ball and explained the equation A cos(Wt) by defining the terms. I'm not sure if the small ball changes anything...
 
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Kindly see the attached pdf. My attempt to solve it, is in it. I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction. I'm not able to figure out, why my solution is wrong, if it is wrong .
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