Is the Torque Calculation in the Picture Correct?

AI Thread Summary
The torque calculation in the provided image is questioned due to the assertion that all joints are torque-free. Despite this concern, some participants believe the calculation is accurate. The discussion highlights a potential conflict between theoretical learning and practical application in torque calculations. The validity of the calculation remains a point of contention among contributors. Overall, the debate centers on the interpretation of torque-free conditions in relation to global power calculations.
Lorens
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Is the calculation in the Picture incorrect? The reason I believe so is that all the joints are torque free, but then I have been learned in school that you always can calculate the global powers in that way

http://img74.imageshack.us/img74/5212/confused0yi.jpg
 
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Yes, looks correct to me.
 
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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