Physics
Thermodynamic
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#89 Numerical: 50 g steam at 100°C condenses (Lv=2.26 MJ/kg). Heat released˜
A) 1.13×10^5 J
B) 2.26×10^5 J
C) 1.13×10^4 J
D) 2.26×10^4 J
#90 Numerical: Compressing a gas adiabatically does
A) decreases its T
B) increases its T
C) leaves T same
D) random
#91 Numerical: 0.10 kg ice at 0°C into 0.30 kg water at 20°C. Will all ice melt? (Lf=334 kJ/kg, c=4200)
A) Yes; final ~?°C
B) No; some ice left
C) Temperature rises
D) None
#92 Numerical: Gas absorbs 800 J; ?U=200 J. Work by gas=
A) 600 J
B) 1000 J
C) 200 J
D) -600 J
#93 Numerical: For ideal monoatomic gas, Cv=(3/2)R. For 3 mol and ?T=10 K, ?U˜
A) 45R J
B) 30R J
C) 15R J
D) 3R J
#94 Numerical: A 60 W immersion heater runs 5 min in 0.50 kg water. ?T˜
A) 3.6 K
B) 6.0 K
C) 8.6 K
D) 10.0 K
#95 Numerical: A gas expands from 1 L to 4 L at constant P=2×10^5 Pa. Work˜
A) 300 J
B) 600 J
C) 1000 J
D) 6000 J
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