A doughnut contains about 302 Calories. (Note: These are \"food\" Calories.) After eating this doughnut, you...

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A doughnut contains about 302 Calories. (Note: Theseare \"food\" Calories.) After eating this doughnut, you decide tocompensate by taking the stairs instead of using the elevator. Ifeach stair has a height of 22 cm, how many stairs must you climb tocompensate for the doughnut? Assume all the energy in the doughnutcan be converted to mechanical energy. (Take 75 kg as the mass of atypical person.)

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3.9 Ratings (489 Votes)

Given that the energy contains in doughnut is Q = 302 Calories

                                                                       = 302x103 cal

                                                                       = 302x103 x4.19 J

                                                                       = 1265.38x103 J          

(Since 1 Calorie is equal to 1000 cal)

Total energy required to reach height h is Q = mgh

                                                             h = Q /mg

                                                                = 1265.38x103 J / 75kg*9.8m/s2       

                                                                = 1.7216x103 m

But height of the each step is h' = 22cm = 0.22m

Number of stairs that you climb is

                    N = h /h'

                        = 1.7216x103 m / 0.22m

                        = 7.825x103

                        = 7825 steps


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