Stemming a chimney. A rock climber of mass 60 kg wants to make her way up the crack betw...

Stemming a chimney. A rock climber of mass 60 kg wants to make her way up the crack between two rocks as shown in Figure P4.14. The coefficient of friction between her shoes and the rock surface is What is the smallest normal force she can apply to both surfaces without slipping? Assume the rock walls are vertical. Hint: Why is the normal force between the climber and the rock on the left equal to the normal force between her and the rock on the right?