3. Working off a Doughnut

3. Working off a Doughnut A 55.0 kg person eats a 540 Calorie jelly doughnut while doing their physics homework. A dietary "Calorie" is equivalent to a kilo-calorie in MKS units. a. How many joules of energy are the energetic equivalent to a single jelly doughnut? Explain your work. b. Assuming the height of a step in a staircase is 15.0 cm, how many steps must this person climb to change their gravitational potential energy in relation to Earth an equal amount as the energy of a jelly doughnut? c. If the human body is only 25%% efficient in converting chemical energy into mechanical energy, how many steps must this person walk to work off that jelly doughnut