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Specific Heat A weight lifter raises 20kg a height of 0.5m. How many times must he...

Specific Heat

A weight lifter raises 20kg a height of 0.5m. How many times must he do this to burn the 120 Calories in a sports drink?

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Answer #1

1 Calorie = 4184 J

120 Calories = 502080 J

Energy required to lift 20 kg is

          E = m g h

              = ( 20 kg ) ( 9.8 m/s2 ) ( 0.5 m )

              = 98 J

Number time he lifts to burn the drink

      N = 502080 J / 98 J

          =5123.26

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