Calorimetry (Heat Transfer) Practice Questions

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Thermodynamics Learning Material
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13.4Calorimetry (Heat Transfer)

Physics Revision Questions for Calorimetry (Heat Transfer)

1) If a 100 g iron piece at 100°C is inserted into a calorimeter containing 390 g of water at 20°C, what will the final temperature of iron be?

ciron = 0.1 cal/g°C
cwater = 1 cal/g°C
  • 22°C
  • 28°C
  • 60°C
  • 62°C
  • Correct Answer: A

    2) A 20 cm2 iron plate of 5 cm thickness absorbs 10 000 J of heat energy when it was in contact with a heat source. During this process, the temperature of iron increased by 2K. Given that the coefficient of thermal conductivity for iron is 94 W/m × K, calculate the time of iron plate exposure to the heat source.

    1. 7.52 s
    2. 1330 s
    3. 13.3 s
    4. 752 s

    Correct Answer: B

    3) 50% of a child's body of area 1.4 m2 is covered by sweat during a hot summer day. If the pressure of water vapour near his body surface is 40 kPa and the normal air pressure is 100 kPa, calculate the heat energy removed from the body during the sweating process in 5 minutes. Take the coefficient of heat transfer through evaporation when the body is half covered by sweat as 0.05 W/Pa × m2.

    1. 10.5 kJ
    2. 1260 kJ
    3. 21 kJ
    4. 630 kJ

    Correct Answer: D

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