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How many calories are burnt by a person that walks up the stairs to his flat 65 m above...

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torrip996 | Student, Grade 10 | Salutatorian

Posted September 21, 2013 at 5:42 PM via web

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How many calories are burnt by a person that walks up the stairs to his flat 65 m above the ground if his mass is 125 kg.

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justaguide | College Teacher | (Level 2) Distinguished Educator

Posted September 21, 2013 at 5:48 PM (Answer #1)

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The work done by a person when he climbs to a higher level is equivalent to the increase in the potential energy of the person. Assume that the person can walk at 100% efficiency and all the work done is converted to gravitational potential energy.

When the person with mass 125 kg climbs a height of 65 m, the increase in the gravitational potential is 125*65*9.8 = 79625 J.

One Joule  = 0.239005736 calories, 79625 J = 18.544 KCal.

The number of calories burnt by the person in climbing to his flat as 18.544 kcal.

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