ib-physics-ch3.pdf

# ib-physics-ch3.pdf - E N D O F-TO P I C Q U E S T I O N S...

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1 E N D - O F -TO P I C Q U E S T I O N S © Oxford University Press 2014: this may be reproduced for class use solely for the purchaser’s institute Solutions for Topic 3 – Thermal physics 1. a) specific heat capacity depends on mass of object; objects of the same specific heat capacity will require more energy to heat a larger mass to the same temperature b) area of contact will only affect the rate of transfer, not the direction c) higher specific heat capacity means heat is transferred more readily d) energy will be transferred from the object with the higher temperature to that of lower temperature 2. If the objects are at the same temperature, there is no transfer of energy between them, so their internal energy must be the same. 3. a) internal energy is the sum of the potential energy of the particles (arising from intermolecular forces) and the random kinetic energy of the particles b) c = Q _ m T = 1.2 × 10 3 _ 0.25 × 20 = 240 J kg 1 K 1 4. Q = 3.0 × (120 20) × 490 = 1.47 × 10 5 J 5. T = 8 K ; Q = (0.07 × 8 × 4200) + (0.08 × 8 × 390) = 2.6 kJ

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