3.11 A piston/cylinder arrangement, shown in Fig. P3.11, contains air at 250 kPa, 300°C. The 50-kg piston has a diameter of 0.1 m and initially pushes against the stops. The atmosphere is at 100 kPa and 20°C. The cylinder now cools as heat is transferred to the ambient. FIGURE P3.11 a. At what temperature does the piston begin to move down? b. How far has the piston dropped when the temperature reaches ambient? Po Air 25 c

3.11 A piston/cylinder arrangement, shown in Fig. P3.11, contains air at 250 kPa, 300°C. The 50-kg piston has a diameter of 0.1 m and initially pushes against the stops. The atmosphere is at 100 kPa and 20°C. The cylinder now cools as heat is transferred to the ambient. FIGURE P3.11 a. At what temperature does the piston begin to move down? b. How far has the piston dropped when the temperature reaches ambient? Po Air 25 c

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

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Entropy

In physics, entropy means the amount of disorder or the degree of randomness associated with a thermodynamic system. The system is not self-organized when the entropy of the system is high. For instance, when a system is at an elevated temperature, its molecules are in random motion, vibrating and colliding with each other. During this scenario, the probability of finding a molecule at a particular place twice, is low. Under this circumstance, the system can be said to be in a high entropy.

Question

3.11 A piston/cylinder arrangement, shown in Fig. P3.11, contains air at 250 kPa, 300°C.
The 50-kg piston has a diameter of 0.1 m and initially pushes against the stops. The
atmosphere is at 100 kPa and 20°C. The cylinder now cools as heat is transferred to
the ambient.
FIGURE P3.11
a. At what temperature does the piston begin to move down?
b. How far has the piston dropped when the temperature reaches ambient?
8
Po
Air
25 cm

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