He- 36" -24" 王 40"

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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2.78 An automobile has just dropped into a river. The car door is approximately a rectangle, measures 36 in. wide
and 40 in. high, and hinges on a vertical side. The water level inside the car is up to the midheight of the door, and
the air inside the car is at atmospheric pressure. Calculate the force required to open the door if the force is applied
24 in. from the hinge line. See Fig. P2.78. (The driver did not have the presence of mind to open the window to
escape.)
36"
-24"
V
40
■FIGURE P2.78
Transcribed Image Text:2.78 An automobile has just dropped into a river. The car door is approximately a rectangle, measures 36 in. wide and 40 in. high, and hinges on a vertical side. The water level inside the car is up to the midheight of the door, and the air inside the car is at atmospheric pressure. Calculate the force required to open the door if the force is applied 24 in. from the hinge line. See Fig. P2.78. (The driver did not have the presence of mind to open the window to escape.) 36" -24" V 40 ■FIGURE P2.78
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