You curl a 5.5-kg (12 lb) barbell that is hanging straight down in your hand up to your shoulder.
A) If the body is 20% efficient at converting chemical energy into mechanical energy, how many times would you have to lift the barbell in order to burn enough calories to use up the energy absorbed by eating a 300-food-calorie dish of ice cream? Note: 1 food calorie = 1 kilocalorie = 4186 J.
B) If the body is 20% efficient at converting chemical energy into mechanical energy, how many times would you have to lift the barbell in order to burn enough calories to use up the energy absorbed by eating a 300-food-calorie dish of ice cream? Note: 1 food calorie = 1 kilocalorie = 4186 J.