Physics
Thermodynamic
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#33 Latent heat is heat absorbed/released at
A) constant temperature during phase change
B) variable temperature
C) zero pressure
D) high velocity
#34 Numerical: 0.50 kg water (c=4200 J kg^-1 K^-1) heated by 10 K. Heat Q˜
A) 2.1 kJ
B) 21 kJ
C) 210 kJ
D) 0.21 kJ
#35 Numerical: 200 g copper (c=390 J kg^-1 K^-1) cools by 30 K. Heat lost˜
A) 2.34 kJ
B) 0.78 kJ
C) 23.4 kJ
D) 0.234 kJ
#36 Numerical: Ice at 0°C melts. Heat required is
A) mLf
B) mc?T
C) mLv
D) zero
#37 Numerical: 100 g ice at 0°C (Lf=334 kJ/kg) melts completely. Q˜
A) 3.34 kJ
B) 33.4 kJ
C) 0.334 kJ
D) 334 kJ
#38 Calorimetry assumes
A) no heat loss to surroundings
B) heat lost = 0
C) mass lost = 0
D) temperature constant
#39 Numerical: 0.2 kg aluminum (c=900) at 80°C dropped into 0.3 kg water at 20°C. Final T (no loss) ˜
A) 26°C
B) 30°C
C) 34°C
D) 40°C
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