A Man need to carry 10 bags of Cement for along a distance of 10m. Each bag of Cement is 10kg. Knowing that work done is Force x Distance. Calculate the Energy needed in Kcals to transport the Bags.

The total mass ($M$) is the number of bags multiplied by the mass of each bag.

$$M = 10 \text{ bags} \times 10 \text{ kg/bag} = 100 \text{ kg}$$

The force ($F$) needed to carry the bags is equal to their weight. We use the acceleration due to gravity ($g \approx 9.81 \text{ m/s}^2$).

$$F = M \times g$$ $$F = 100 \text{ kg} \times 9.81 \text{ m/s}^2 = 981 \text{ N}$$

Work done ($W$) is given by the formula Force $\times$ Distance.

$$W = F \times \text{Distance}$$ $$W = 981 \text{ N} \times 10 \text{ m} = 9810 \text{ J}$$

We know that $1 \text{ calorie} = 4.184 \text{ Joules}$.

$$W_{\text{calories}} = \frac{9810 \text{ J}}{4.184 \text{ J/calorie}}$$ $$W_{\text{calories}} \approx 2344.646 \text{ calories}$$

We know that $1 \text{ Kcal} = 1000 \text{ calories}$.

$$W_{\text{Kcals}} = \frac{2344.646 \text{ calories}}{1000 \text{ calories/Kcal}}$$ $$W_{\text{Kcals}} \approx 2.3446 \text{ Kcals}$$

The energy needed to transport the bags is approximately $\text{2.34 Kcals}$.