Answer to Question #180582 in Physics for Zainab

Question

How much heat is needed to raise the temperature from 25oC to 50oC of 5kg

of substance? The specific heat capacity of the substance is 300J/kgoC

Answer 1

The heat, needed to change the temperature of substance with specific heat capacity $c$ by $\Delta T$ degrees is $Q = c m \Delta T$.

Hence, $Q = 300 \frac{J}{kg \cdot ^{\circ} C} \cdot 5 kg \cdot (50^{\circ} C - 25 ^{\circ} C) \approx 37.5 \cdot 10^3 J = 37.5 kJ$.