Determine the change in entropy (in J/K) when 5.00 moles of an ideal gas at 0°C are compressed isothermally from an initial volume of 100 cm3 to a final volume of 20 cm3.
A. ?191
B. ?52
C. ?71
D. ?67
E. ?208
Answer: D
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Two ideal Carnot thermodynamic engines have the same efficiency. One operates between 5.0 × 102 K and 3.0 × 102 K, and the other between 4.0 × 102 K and some lower temperature. What is the lower temperature?
A) 200 K B) 220 K C) 240 K D) 260 K E) 280 K
Distinguish between anticlines and synclines
What will be an ideal response?
GIVEN ? A disk rotating in air ? Diameter (D) = 2 m ? Rotational speed (?) = 600 rev/min ? Air temperature (T?) = 20°C ? Surface temperature (Ts) = 50°C FIND ? The rate of heat transfer from one side (q) ASSUMPTIONS ? The heat transfer has reached steady state ? The disk is horizontal ? Air is still SKETCH
GIVEN
? A disk rotating in air
? Diameter (D) = 2 m
? Rotational speed (?) = 600 rev/min
? Air temperature (T?) = 20°C
? Surface temperature (Ts) = 50°C
FIND
? The rate of heat transfer from one side (q)
ASSUMPTIONS
? The heat transfer has reached steady state
? The disk is horizontal
? Air is still
SKETCH
PROPERTIES AND CONSTANTS
From Appendix 2, Table 28, for dry air at the mean temperature of 35°C
A person on a diet loses 1.6 kg in a week. How many micrograms/second (?g/s) are lost?
A) 2.6 × 103 ?g/s B) 1.6 × 105 ?g/s C) 44 ?g/s D) 6.4 × 104 ?g/s