PartA - food calories = food calories Solution We know that 1 hp = 746 W ==> Mec

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We know that        1 hp = 746 W ==> Mechanical power of human = 1/3 hp                                                      = (1/3 ) (746 W)                                                      = 249 W Given that           Time = 1hour = 3600 sec Therefore        Mechanical energy = mechanicalpower * time                                    = 249 * 3600 J                                    = 8,96,400 J Converting into calories        1 calorie = 4.18 J ==> Mechanical energy = 214,449.76 calorie                                       = 214.45 kCal                                       = 214.45 foold calorie The amount of food calories burnt up = Z                   20 % of Z = 214.45 ==> Z * 20/100 =214.45                               Z/5 = 214.45                                 Z = 214.45 * 5       = 1072.25 food calories

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