Question
An insulated rigid tank contains 1.5 kg of helium at 30∘C and 500 kPa. A paddle wheel with a power rating of 0.1 kW is operated within the tank for 30 minutes. Cvof helium = 3.12 KJ/Kg.K
Problem 7A. Calculate the net work done by helium, in kJ. Enter the number with appropriate sign.
Problem 7B. What is the final temperature of helium, in ∘C ?
Problem 7C. What is the final pressure of helium, in kPa?
Problem 7D. What is the change in entropy of helium, in J/K?
Problem 7E. How much entropy is produced during the process, in J/K?
Problem 7F. What are the causes of the entropy production?
a)Violation of the second law
b)An adiabatic process
c)The stirrer work
d)The increase in temperature
Problem 7A. Calculate the net work done by helium, in kJ. Enter the number with appropriate sign.
Problem 7B. What is the final temperature of helium, in ∘C ?
Problem 7C. What is the final pressure of helium, in kPa?
Problem 7D. What is the change in entropy of helium, in J/K?
Problem 7E. How much entropy is produced during the process, in J/K?
Problem 7F. What are the causes of the entropy production?
a)Violation of the second law
b)An adiabatic process
c)The stirrer work
d)The increase in temperature
Answers
nicholo
210
70
12
1000
800
the increase in temperature
70
12
1000
800
the increase in temperature
Anonymous
all wrong
ABC
-180
69 C
563.5
550
550
b)
69 C
563.5
550
550
b)
@aabc
all correct except last one. option is wrong/more than one option should be included.