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06_P30InstructorSolution - 6.30 Model Visualize The plastic...

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6.30. Model: The plastic ball is represented as a particle in static equilibrium. Visualize: Solve: The electric force, like the weight, is a long-range force. So the ball experiences the contact force of the string’s tension plus two long-range forces. The equilibrium condition is () ( ) () () net elec elec net G sin 0 N cos 0 N
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