a. A 120-lb girl is walking up a 48-lb uniform beam as shown in the figure below. Determine how far up the beam the girl can walk before the beam starts to slip if (a) the coefficient of friction is 0.20 at all surfaces and (b) the coefficient of friction at the bottom end of the beam is increased to 0.40 by placing a piece of rubber between the beam and the floor. 6A

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