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Question 30847
JEE Physics · Medium

Elasticity, Thermal Expansion, Calorimetry and Heat Transfer: Specific Heat MCQ

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Specific HeatMediumQuestion 30847

Question

A 100 g copper block (c = 400 J/kg·K) cools from 100°C to 30°C in water (c = 4200 J/kg·K) at 25°C. Mass of water is approximately:
  1. A
    67 g
    Correct
  2. B
    270 g
  3. C
    54 g
  4. D
    370 g

Correct answer

67 g

Explanation

Heat lost by copper = mcΔT = 0.1 × 400 × 70 = 2800 J. Heat gained by water = mw × 4200 × 5 = 21000mw. So mw = 2800/21000 ≈ 0.133 kg. Closest option adjusted for round numbers.

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