A desperate hiker has to think fast to help his friend who has fallen below him. Quickly, he ties a rope to a rock of mA = 405 kgand makes his way over the ledge (see the figure below). If the coefficient of static friction between the rock and the ground isH=0.348, and the mass of the hiker is ma= 70.1 kg, what is the maximum mass of the friend, mc, that the rock can hold so thehikers can then make their way up over the ledge? Assume the rope is parallel to the ground and the point where the ropepasses over the ledge is frictionless. (ANS: 70.8 kg)

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