The belt on the portable dryer wraps around the drum D, idler pulley A, and motor pulley B.If the motor can develop a maximum torque of M = 0.80 N•m, determine the smallest spring tension required to hold the belt from slipping. The coefficient of static friction between the belt and the drum and motor pulley is μ_s = 0.3.

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130° 50 mm -M 0.8 N-m A D 45° 50 mm ww 20 mm