Question

One cup of kidney beans contains 15 g of protein, 1 g of fat, and 42 g of carbohydrate. if you are walking and using energy at a rate of 840 kj/hr, how many minutes will you need to walk to expend the energy from the cup of kidney beans?

Answer 1

(A): Calculate how much energy we can get from given nutrients first

The caloric values are:

4 kcal/g for carbohydrate,

9 kcal/g for fat, and

4 kcal/g for protein.

(15 x 4) + (1 x 9) + (42 x 4) = 237 Kcal energy is released.

1 kcal = 4.184 kJ

237 kcal = 237 x 4.184 = 991.608 kJ energy

(B) 840 kJ/hour = 840 kJ/60 min = 14 kJ/min

991.608 kJ / 14 min = 70.83 min = 71 min

Final answer: 71 minutes

71 minutes will need to walk to expend the energy from the cup of kidney beans.

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