example 1-1 - Example 1-1 A man with a mass of 110 kg...

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Example 1-1 A man with a mass of 110 kg decides to lose weight by climbing the stairs in his office building several times a day. With his current daily activities and food intake, his weight is stable, but he would like to lose 0.5 kg per week without reducing food intake. Data shows that a person must burn 8000 Cal to lose 1 kg of mass (1 Cal = 4.19 x 10 3 J). If each story of the office building has a height of 4 m, how many stories per day must the man climb (assume a five-day work week)? Also assume negligible heat transfer from the man to the environment. Solution: Choose the man to be the closed system under study. From the first law KE PE U Q W ∆+ ∆=− The velocity of the man is the same at the top and the bottom of the stairs, so 0. KE = No heat is transferred between the man and the environment, so
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This note was uploaded on 04/06/2009 for the course ENGR 2250 taught by Professor Borca-tasciuc during the Spring '08 term at Rensselaer Polytechnic Institute.

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example 1-1 - Example 1-1 A man with a mass of 110 kg...

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