Physics
Thermodynamic
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#81 Numerical: 0.25 kg water at 20°C mixed with 0.20 kg at 80°C. Final T (no loss)˜
A) 40°C
B) 47°C
C) 53°C
D) 60°C
#82 Numerical: 2.0 mol ideal diatomic gas (assume Cp=(7/2)R) heated isobarically by 30 K. Heat Q˜
A) 210R J
B) 105R J
C) 70R J
D) 35R J
#83 Numerical: Same as above, work W˜
A) nR?T = 60R J
B) 0
C) (5/2)nR?T
D) nCv?T
#84 Numerical: Gas expands at constant P from 0.010 to 0.030 m^3. P=1.5×10^5 Pa. Work˜
A) 1500 J
B) 3000 J
C) 4500 J
D) 6000 J
#85 Numerical: 300 g aluminum (900) at 100°C into 300 g water at 20°C. Final T˜
A) 50°C
B) 60°C
C) 70°C
D) 80°C
#86 Numerical: 1.0 mol ideal monoatomic gas expanded isothermally at 400 K from V to 3V. Work˜
A) nRT ln3
B) 3nRT
C) nCv?T
D) 0
#87 Numerical: If heat 1000 J is given to a rigid container gas (?V=0), and ?U=?
A) 0
B) 1000 J
C) -1000 J
D) 500 J
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