Question

A 150-lb person burns about 2700 Calories to run a marathon. How much energy is burned in kJ?

Answer 1

Answer:

150-lb person burned 11.30 kilo Joules of energy to ran a marathon.

Explanation:

Number of calories burned by 150-lb person = 2700 calories

1 cal = 0.001 kcal

$2700 cal=2700\times 0.001 kcal=2.700 kcal$

1 kilo calorie = 4.184 kilo Joules

Energy associated with 2.700 kcal:

$2.700\times 4.184 kJ=11.30 kJ$

150-lb person burned 11.30 kilo Joules of energy to ran a marathon.

Answer 2

The question above is simply asking us to convert the value from calories into kilojoules. Therefore, we need some factor to multiply to be able to convert it to such units. For calories to kJ, the factor would be 4.184.

2700 cal ( 4.184 kJ/cal) = 11296.8 kJ