A piston-cylinder device initially contains 20 g of saturated water vapor at 350 kPa. A resistance heater is operated within the cylinder with a current of 0.4 A from a 240 V source until the volume doubles. At the same time a heat loss of 2.0 kJ occurs. Assume the surrounding temperature and pressure to be 20 "C and 100 kPa.

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
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Problem 1.1MA
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Part A
A piston-cylinder device initially contains 20 g of
saturated water vapor at 350 kPa. A resistance heater
is operated within the cylinder with a current of 0.4 A
from a 240 V source until the volume doubles. At the
same time a heat loss of 2.0 kJ occurs. Assume the
surrounding temperature and pressure to be 20 °C
and 100 kPa.
Determine the final temperature (T).
Express your answer to the nearest tenth and include appropriate units.
550.6
°C
Submit
Previous Answers Request Answer
X Incorrect; Try Again; 4 attempts remaining
Review your calculations and make sure you round to 1 decimal places
Transcribed Image Text:Part A A piston-cylinder device initially contains 20 g of saturated water vapor at 350 kPa. A resistance heater is operated within the cylinder with a current of 0.4 A from a 240 V source until the volume doubles. At the same time a heat loss of 2.0 kJ occurs. Assume the surrounding temperature and pressure to be 20 °C and 100 kPa. Determine the final temperature (T). Express your answer to the nearest tenth and include appropriate units. 550.6 °C Submit Previous Answers Request Answer X Incorrect; Try Again; 4 attempts remaining Review your calculations and make sure you round to 1 decimal places
Part B
A piston-cylinder device initially contains 20 g of
saturated water vapor at 350 kPa. A resistance heater
is operated within the cylinder with a current of 0.4 A
from a 240 V source until the volume doubles. At the
same time a heat loss of 2.0 kJ occurs. Assume the
surrounding temperature and pressure to be 20 C
and 100 kPa.
Determine the duration of the process.
Express your answer to four significant figures and include appropriate units.
15.65
kJ
Submit
Previous Answers Request Answer
X Incorrect; Try Again; 5 attempts remaining
Enter your answer using units of time.
Part C
Determine the second-law efficiency.
Express your answer to three significant figures.
It vec
0) ?
163.025
Transcribed Image Text:Part B A piston-cylinder device initially contains 20 g of saturated water vapor at 350 kPa. A resistance heater is operated within the cylinder with a current of 0.4 A from a 240 V source until the volume doubles. At the same time a heat loss of 2.0 kJ occurs. Assume the surrounding temperature and pressure to be 20 C and 100 kPa. Determine the duration of the process. Express your answer to four significant figures and include appropriate units. 15.65 kJ Submit Previous Answers Request Answer X Incorrect; Try Again; 5 attempts remaining Enter your answer using units of time. Part C Determine the second-law efficiency. Express your answer to three significant figures. It vec 0) ? 163.025
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