Dynamics question related to conservation of string

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SUMMARY

The discussion centers on a dynamics problem involving the conservation of string in a system with two blocks, A and B. The equation provided, 2xb - 3xa = constant, is critical for determining the velocity of block A when block B moves at 300 mm/s to the right. The user expresses confusion regarding the correct formulation of the cord length equation, suggesting an alternative that includes both blocks. Clarification on the relationship between the blocks and the cord length is essential for solving the problem accurately.

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  • Understanding of basic dynamics principles
  • Familiarity with kinematic equations
  • Knowledge of conservation of string concepts
  • Ability to analyze motion in mechanical systems
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This discussion is beneficial for students studying dynamics, mechanical engineers, and educators looking to clarify concepts related to motion and constraints in mechanical systems.

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Homework Statement


http://tinypic.com/r/10f5ni8/9
http://[PLAIN]http://i66.tinypic.com/10f5ni8.png

Homework Equations


I have a problem understanding this problem. It asks for the velocity of block A when block B is moved 300mm/s to the right. The equation for the cord length is given as 2xb-3xa=constant.

The Attempt at a Solution


I don't understand the equation at all. wouldn't the total cord of the length be xb + (xb-xa) +2xa= constant? help! i understand how to get velocities and all the problems similar to this one, but expect this one :(
 
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