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What Is the Minimal Tension Angle for a Mass Pulled Horizontally?
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[QUOTE="mfb, post: 4974822, member: 405866"] The normal force is not mg, you have to consider this for the horizontal part (you did that correctly for the vertical part). You have two equations with three unknown parameters - tension, angle, and normal force. This does not have a unique solution. To find the angle of minimal tension, it would be nice to have an equation that depends on tension and angle only (there you can follow the standard approach with the derivative), but not on the unknown normal force any more. You can solve one equation for the normal force and plug it into the other to get that. [/QUOTE]
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What Is the Minimal Tension Angle for a Mass Pulled Horizontally?
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