In 1981, Daniel Goodwin climbed 443 m up the exterior of the Sears Building in Chicago using suction cups and metal clips.

(a) Approximate his mass and then compute how much energy he had to transfer from biomechanical  (internal) energy to the gravitational potential energy of the Earth – Goodwin system to lift himself to that height.

(b) How much energy would he have had to transfer if he had, instead, taken the stairs inside the building (to the same height)?

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