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312. A 0.8 m long sign extends from a wall supported by a rope as shown. If the sign has uniform density, what is the minimum coefficient of friction between the sign and the wall? 30° Sign 0.2 m B. 0.50 C. 0.87 D. 1.0

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that is at centre balancim at Tess) o. 2 = w (0.4) r balancing Sorces, an d rom eq 2 and 02. Cos&

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