Note: I only have 15 mintues Heat is added to Water (an incompressible substance

Question

Note: I only have 15 mintues

Heat is added to Water (an incompressible substance) to raise its temperature from 20 C to 40 C. What is the change of entropy per kilogram of the water? (Cavg = 4.2 kJ/kgK)

2.

7-9

Air is compressed such that it specific volume decreases by half. During the process its temperature increases from 20 C to 40C. What is the change in the entropy of the air? (Cv = 0.718kJ/kgK, R = 0.287kJ/kgK)

Heat is added to Water (an incompressible substance) to raise its temperature from 20 C to 40 C. What is the change of entropy per kilogram of the water? (Cavg = 4.2 kJ/kgK)

A) 0.066 kJ/kgK
B) 0.277 kJ/kgK
C) -0.066 kJ/kgK
D) -0.277 kJ/kgK

2.

7-9

Air is compressed such that it specific volume decreases by half. During the process its temperature increases from 20 C to 40C. What is the change in the entropy of the air? (Cv = 0.718kJ/kgK, R = 0.287kJ/kgK)

A) 0.152 kJ/kgK
B) 1.52 kJ/kgK
C) -0.152 kJ/kgK
D) -1.52 kJ/kgK

Explanation / Answer

1.B) 0.277 kJ/kgK

2.C) -0.152 kJ/kgK

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