A college student produces about 127 kcal of heat per hour onthe average. What i

Question

A college student produces about 127 kcal of heat per hour onthe average. What is the rate of energy production inwatts?_____W How many kilocalories of heat does the operation of a 1195 Whair dryer produce each second? ____kcal/s On a brisk walk, a person burns about 380 Cal/h. At this rate,how many hours of brisk walking would it take to lose a pound ofbody fat?( A pound of body fat stores an amount of chenical energyequivalent to 3500 Cal.)_______h A college student produces about 127 kcal of heat per hour onthe average. What is the rate of energy production inwatts?_____W How many kilocalories of heat does the operation of a 1195 Whair dryer produce each second? ____kcal/s On a brisk walk, a person burns about 380 Cal/h. At this rate,how many hours of brisk walking would it take to lose a pound ofbody fat?( A pound of body fat stores an amount of chenical energyequivalent to 3500 Cal.)_______h

Explanation / Answer

1 ) rate of energy in watts is   127 k cal / h = 147.6J                ( 1 k cal = 4186 J )

                                                                      = 0.0410 W

2 )   1 Watt = 0.000023900 kilocal /s

         1195 W =0.0285 k cal /s

3 ) Hours lost by the person  is   380 cal / h / 3500 cal

                                                 = 0.108 h

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