60. (a) If L(= 1500 cm) is the unstretched length of the rope and ΔL=28.cmistheamount it stretches then the strain is ΔLL/./.==×−2 8150019 103cmcmbgbg.(b) The stress is given by F/Awhere Fis the stretching force applied to one end of the rope and Ais the cross–sectional area of the rope. Here Fis the force of gravity on the rock climber. If mis the mass of the rock climber then
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