Question

2. A person decides to loose weight by eating only cold food. A 100 g piece of apple pie yields 1500 kJ of energy when eaten. It its specific heat is 1.7 kJ/kg °C, how much less energy is its energy component at 5°C than at 25°C?

Answer 1

Question #58812, Biology, Other

A person decides to loose weight by eating only cold food. A 100 g piece of apple pie yields 1500 kJ of energy when eaten. It its specific heat is 1.7 kJ/kg °C, how much less energy is its energy component at 5°C than at 25°C?

Answer:

$$Q = c \cdot m \cdot \Delta T$$ $$T_2 - T_1 = 25 - 5 = 20^{\circ}C$$ $$Q_\Delta = 1.7 \cdot 0.1 \cdot 20 = 3.4\ \mathrm{kJ}$$

So that the difference of energy content between cold and warm pie is 3.4 kJ.

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