why is it 123.7?isnt it in third quadrant so 180+(90-56.3)=213.7 Take moment about point A.EMA =0MA =-F, x6+ F, x(5+4)Substitute F cos a for F, and Fsina for F,.M, =-F cosax6+F sin a x(5+4) .(1)......Differentiate the above equation with respect to angle.dM, d-F cosax6+Fsina×(5+4)dada= 6F sin a +9F cos aFor the maximum moment,6Fsin α + 9F cos α = 09tan a =a =-56.3Calculate the angle from positive x direction.a = 180– 56.3= 123.7°Therefore, the allowable angle for the required force is 123.7° The ball of a trailer hitch is subjected to a force F. If failure occurs when the moment of Faboutpoint A reaches 10.000 in.-lb. determine the largest value F may have and specify the value of afor which the moment about .A is the largest. Note that the value of Fyou determine must notproduce a moment about, A that exceeds 10.000 in.-Ib for any possible value of a.- 5 in. --- 4 in. -HAO6 in.FFigure P4.7

Consider the given force with angle as shown below, The angle α is between the force F and the…

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why is it 123.7? isnt it in third quadrant so 180+(90-56.3)=213.7

Elements Of Electromagnetics

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ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

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Question

why is it 123.7?

isnt it in third quadrant so 180+(90-56.3)=213.7

Take moment about point A.
EMA =0
MA =-F, x6+ F, x(5+4)
Substitute F cos a for F, and Fsina for F,.
M, =-F cosax6+F sin a x(5+4) .
(1)
......
Differentiate the above equation with respect to angle.
dM, d-F cosax6+Fsina×(5+4)
da
da
= 6F sin a +9F cos a
For the maximum moment,
6Fsin α + 9F cos α = 0
9
tan a =
a =-56.3
Calculate the angle from positive x direction.
a = 180– 56.3
= 123.7°
Therefore, the allowable angle for the required force is 123.7°

The ball of a trailer hitch is subjected to a force F. If failure occurs when the moment of Fabout
point A reaches 10.000 in.-lb. determine the largest value F may have and specify the value of a
for which the moment about .A is the largest. Note that the value of Fyou determine must not
produce a moment about, A that exceeds 10.000 in.-Ib for any possible value of a.
- 5 in. --- 4 in. -
HAO
6 in.
F
Figure P4.7

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