(5-30) (a) Suppose the coefficient of kinetic friction between mA and the plane in Fig. 5-38 is

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(5-30) (a) Suppose the coefficient of kinetic friction between mA and the plane in Fig. 5-38 is uk = 0.15, and thatmA = mB = 2.7 kg. As mB moves down, determine the magnitude of the acceleration of mA and mB, given angle is 34°. (b) What smallest value of uk will keep the system from accelerating?
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The mistake comes in at 1:38. She forgot to factor out g from the u*g*cos term. Other than that, it checks out

jmirabelle