2.78 An automobile has just dropped into a river. The car door is approximately a rectangle, measures 36 in. wideand 40 in. high, and hinges on a vertical side. The water level inside the car is up to the midheight of the door, andthe air inside the car is at atmospheric pressure. Calculate the force required to open the door if the force is applied24 in. from the hinge line. See Fig. P2.78. (The driver did not have the presence of mind to open the window toescape.)36"-24"V40■FIGURE P2.78

Answered: Image /qna-images/answer/e0d0e652-3f9e-4e4a-9e7e-941673342c4d.jpg

Answered: He- 36" -24" 王 40"

Engineering

Mechanical Engineering

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

Problem 1.1MA

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Concept explainers

Free Body Diagram

The system of forces acting on a body tends to either rotate it or make the body undergo motion. In general, when an external agent exerts a force on a body, the body undergoes translational motion and rotational motion. The body has six degrees of freedom under the influence of that force. Here, three degrees of freedom are from the translational motion while the other three are from the rotation motion. However, sometimes the bodies are not allowed to undergo any motion and are fixed, under such conditions the body is said to be constrained.

Question

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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