Answer :
The work done by the person is approximately 7,071 ft-lb.
To calculate the work done, we need to consider the weight of the person and the vertical distance they have climbed. The weight of the person is given as 141 lb. Since the person is walking up a circular, spiral staircase, the vertical distance they have climbed after one revolution is 10 ft.
The total distance covered after one and a half revolutions is (2 * π * 5 ft * 1.5) = 47.12 ft. Since work is equal to force multiplied by distance, we can calculate the work done by multiplying the weight (141 lb) by the vertical distance climbed (47.12 ft) to get approximately 7,071 ft-lb.
Therefore, the work done by the person weighing 141 lb walking one and a half revolution(s) up the circular, spiral staircase is approximately 7,071 ft-lb.
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