A 150-lb person burns about 2700 Calories to run a marathon. How much energy is burned in kJ?
To convert Calories to kilojoules, you can use the conversion factor:
1 Calorie = 4.184 kilojoules
So to find the energy burned in kilojoules, we can multiply the number of Calories by the conversion factor:
2700 Calories × 4.184 kilojoules/Calorie = 11,296.8 kilojoules
Therefore, a 150-lb person burns about 11,296.8 kilojoules to run a marathon.
To convert Calories to kilojoules (kJ), we need to use the conversion factor that 1 calorie is equal to approximately 4.184 joules. It's important to note that when referring to calories in nutritional contexts, it is actually kilocalories (kcal) being used. So, 1 kilocalorie is equal to 1 Calorie, which is the unit often used to measure the energy content in food.
To calculate the amount of energy burned in kJ:
1. We first convert pounds (lb) to kilograms (kg). 1 lb is approximately 0.4536 kg. So, 150 lb is approximately 68.04 kg. (150 lb * 0.4536 kg/lb = 68.04 kg)
2. Next, we multiply the mass in kilograms by the energy expended per kilogram of body weight during the marathon. In this case, we are given that a person burns 2700 Calories to run a marathon.
To get the energy expended per kilogram of body weight, we divide the total energy by the person's weight in kilograms. So, 2700 Calories / 68.04 kg = 39.69 Calories/kg.
3. Finally, we convert Calories to kilojoules. We multiply the energy in Calories by the conversion factor: 39.69 Calories/kg * 4.184 kJ/Calorie = approximately 166.07 kJ/kg.
Therefore, a 150-lb person burns approximately 166.07 kJ per kilogram of body weight to run a marathon.
11.30x10e7
Did you intend, I assume so, to write calorie with a capital C? That stands for 2700 kcal.
1 calorie = 4.184 joules.
1 kJ = 1000 J.
2700 kcal x 1000 = 2,700,000 cal.
2,700,000 cal x * (4.184 J/cal) x (1 kJ/1000 J)