Question

You decide to try and “work off” 20 calories of a food (1 calorie =4kj of energy) using a chest expander you have lying around (see picture). You hold your left hand steady and start pulling the other end of the chest expander to 1 m past the point where it is no longer slack

You can model this situation as if you had a spring with a spring constant of 200 kg/s². One end of the spring is fixed, and you are pulling the loose end down and to the side, 1 m away from its equilibrium position.

Create a particular Energy-Interaction Model for a single pull, and then determine how many times you have to stretch the expander cables to work off the calories (i.e., the total energy contained in the portion of your favorite food).

Answer 1

  

Energy Dissipated in Single pull is,

No. of stretches required to work off the calorie is,