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JAMB Physics 2003 Question 25

Question 25

Quantity of Heat

A 2000W electric heater is used to heat a metal object of mass 5kg initially at 10°C. If a temperature rise of 30°C is obtained after 10min, the heat capacity of the material is

  1. A.6.0 × 104 J °C−1
  2. B.4.0 × 104 J °C−1
  3. C.1.2 × 104 J °C−1
  4. D.8.0 × 103 J °C−1
Show the answer and explanation

Answer: B (4.0 × 104 J °C−1)

Explanation

Heat supplied = 2000 × 600 = 1.2 × 106 J. Heat capacity = 1.2 × 106 ÷ 30 = 4.0 × 104 J °C−1.