opening in the m e petcock, sits on rom escaping unt of the petcock. T ner prevents any 1 keeps the press

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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1-107 A pressure cooker cooks a lot faster than an ordinary
pan by maintaining a higher pressure and temperature inside.
The lid of a pressure cooker is well sealed, and steam can
escape only through an opening in the middle of the lid. A
separate metal piece, the petcock, sits on top of this open-
ing and prevents steam from escaping until the pressure force
overcomes the weight of the petcock. The periodic escape
of the steam in this manner prevents any potentially danger-
ous pressure buildup and keeps the pressure inside at a con-
stant value. Determine the mass of the petcock of a pressure
cooker whose operation pressure is 100 kPa gage and has
an opening cross-sectional area of 4 mm2. Assume an atmo-
spheric pressure of 101 kPa, and draw the free-body diagram
of the petcock. Answer: 40.8 g
i
e
Patm = 101 kPa
Petcock
-A = 4 mm2
1.
Pressure cooker
Transcribed Image Text:1-107 A pressure cooker cooks a lot faster than an ordinary pan by maintaining a higher pressure and temperature inside. The lid of a pressure cooker is well sealed, and steam can escape only through an opening in the middle of the lid. A separate metal piece, the petcock, sits on top of this open- ing and prevents steam from escaping until the pressure force overcomes the weight of the petcock. The periodic escape of the steam in this manner prevents any potentially danger- ous pressure buildup and keeps the pressure inside at a con- stant value. Determine the mass of the petcock of a pressure cooker whose operation pressure is 100 kPa gage and has an opening cross-sectional area of 4 mm2. Assume an atmo- spheric pressure of 101 kPa, and draw the free-body diagram of the petcock. Answer: 40.8 g i e Patm = 101 kPa Petcock -A = 4 mm2 1. Pressure cooker
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