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A 2 kW heater is used to heat a room from 5°C to 20°C. The mass of air in the room is 30 kg.Under these conditions the specific heat of air is 1000J/kg°C. What is the gain in termal energy of the air?



Answer :

MathPhys

Answer:

450 kJ

Explanation:

Heat (q), or thermal energy, is equal to the mass (m) times the specific heat capacity (C) times the change in temperature (ΔT).

q = mCΔT

q = (30 kg) (1000 J/kg/°C) (20°C − 5°C)

q = 450,000 J

q = 450 kJ

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