Suppose you eat a one-third pound hamburger without bread, cheese, or other items. Approximately how long would you need to walk to use up the calories in the hamburger? Assume the mass of the hamburger is 150 g with 3.6 Cal/g and that walking requires 2.5 times a basal metabolic rate of 280 kJ/hr.

Question

Quizplus · Accepted Answer

First, we need to calculate the total number of calories in the hamburger:
150 g * 3.6 Cal/g = 540 Cal

Next, we need to convert this to joules:
540 Cal * 4.184 J/Cal = 2263.76 J

To find the time required to walk off these calories, we need to calculate the total energy expended during walking:
2.5 * 280 kJ/hr = 700 kJ/hr
700 kJ/hr * (1/60) hr/min * (1/60) min/sec = 0.194 kJ/sec

Finally, we can calculate the time required to use up the energy:
2263.76 J / 0.194 kJ/sec = 11662 seconds
11662 seconds / 3600 sec/hr ≈ 3.24 hours

Therefore, the best choice is B - 3 hours.

Suppose You Eat a One-Third Pound Hamburger Without Bread, Cheese