The energy required by a 55 kg person to climb a 1-story building (Assume each flight of stairs is 18 ft high.) is _____ kcal.

Question

Quizplus · Accepted Answer

To climb a 1-story building, the person needs to climb one flight of stairs which is 18 ft high. The work done against gravity is given by:
Work = force x distance = weight x height
The weight of the person is 55 kg x 9.81 m/s^2 = 539.55 N (Newton's second law)
The height climbed is 18 ft = 5.4864 m
Therefore, the work done is:
Work = 539.55 N x 5.4864 m = 2962.8 J (Joules)
1 kcal = 4184 J (conversion factor)
Therefore, the energy required is:
Energy = 2962.8 J ÷ 4184 J/kcal = 0.707 kcal 
(rounded to three significant figures)
Hence, the answer is option C: 0.700.

The Energy Required by a 55 Kg Person to Climb