You curl a 5.5-kg (12 lb) barbell that is hanging straight down in your hand up to your shoulder. 

Part A Determine the work that your hand does in lifting the barbell. Let the barbell be lifted up by 1.0 m, about the arm length. Express your answer to two significant figures and include the appropriate units. 

Part B: Determine the average mechanical power of the lifting process. Suppose it takes 0.3 s to lift the barbell up. Express your answer to two significant figures and include the appropriate units. 

Part C: 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?