Physics

Problem

A student of mass

60\,\text{kg}

climbs a staircase and rises vertically by

5.0\,\text{m}

in each climb. (i) Calculate the mechanical work done by the student in one climb. (ii) Express your answer in kilojoules. (iii) Convert this work into food calories (

1\,\text{kcal} = 4.186\,\text{kJ}

). (iv) A chocolate bar supplies

200\,\text{kcal}

of energy. Estimate how many such climbs would use up the energy obtained from one chocolate bar.

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