The heat required to raise the temperature of 2 kg of a substance by 10°C with specific heat 500 J/kg·°C is:
Correct answer: B. 10000 J
- A. 5000 J
- B. 10000 J
- C. 2000 J
- D. 2500 J
Explanation
Heat required is Q = m·c·ΔT, where m = 2 kg, c = 500 J/kg·°C, and ΔT = 10°C. Thus, Q = 2 × 500 × 10 = 10,000 J.
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Thermal equilibrium means that bodies in contact have the same temperature and no net heat flows between them. The topic distinguishes heat from temperature, uses the zeroth law of thermodynamics, and covers heat transfer, specific heat capacity, thermal expansion and the conditions for reaching equilibrium.
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