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Elements Of Electromagnetics
7th Edition
ISBN: 9780190698614
Author: Sadiku, Matthew N. O.
Publisher: Oxford University Press
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Question

Transcribed Image Text:Problem 3:
Inputs:
a = 12 in
b = 12.75 in
Use the scalar approach (not the cross product).
The moment exerted by the weight about
point E is 244 lb-in.
Table not required, but feel free to use it if you like
(a) What is the magnitude of the weight?
(round this answer to the nearest whole number)
(b) What is the moment exerted by the
weight about point S?
Problem 4:
Inputs:
a = 1.2 m
b = 0.5 m
P = 50 N
We are going to put this system in equilibrium.
We haven't talked much about equilibrium yet,
but that's okay. In order for a body to be in
equilibrium, we need the sum of the forces to
equal zero, and the sum of the moments about
any point to equal zero.
S
A
Table not required, but feel free to use it if you like
a
FA
30°
a
E
b
40°
P
b
(a) Let's start by summing moments about point A. Determine the magnitude of FB such that EMA = 0.
In other words, compute FB such that the net moment about point A is zero.
(b) Now let's repeat the process at B. Sum moments about point B and compute the magnitude of FA
required to make the net moment about point B equal zero (XMB = 0).
B
FB
(c) Okay, that's all good, but did this satisfy our force summation? Check to see if the vector sum of the
forces equals zero. (Cool right?)
(d) Out of curiosity, sum moments about point C. What is Mc? Is this as expected?

Transcribed Image Text:Problem 3:
Inputs:
a = 12 in
b = 12.75 in
Use the scalar approach (not the cross product).
The moment exerted by the weight about
point E is 244 lb-in.
Table not required, but feel free to use it if you like
(a) What is the magnitude of the weight?
(round this answer to the nearest whole number)
(b) What is the moment exerted by the
weight about point S?
Problem 4:
Inputs:
a = 1.2 m
b = 0.5 m
P = 50 N
We are going to put this system in equilibrium.
We haven't talked much about equilibrium yet,
but that's okay. In order for a body to be in
equilibrium, we need the sum of the forces to
equal zero, and the sum of the moments about
any point to equal zero.
S
A
Table not required, but feel free to use it if you like
a
FA
30°
a
E
b
40°
P
b
(a) Let's start by summing moments about point A. Determine the magnitude of FB such that EMA = 0.
In other words, compute FB such that the net moment about point A is zero.
(b) Now let's repeat the process at B. Sum moments about point B and compute the magnitude of FA
required to make the net moment about point B equal zero (XMB = 0).
B
FB
(c) Okay, that's all good, but did this satisfy our force summation? Check to see if the vector sum of the
forces equals zero. (Cool right?)
(d) Out of curiosity, sum moments about point C. What is Mc? Is this as expected?
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