p13 019

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19.

(a) Analyzing the horizontal forces (which add to zero) we find F

h

= F

3

= 5.0 N.

(b) Equilibrium of vertical forces leads to F

v

= F

1

+ F

2

= 30 N.

(c) Computing torques about point O, we obtain

F

v

d = F

2

b + F

3

a

=

⇒ d =

(10)(3.0) + (5.0)(2.0)

30

= 1.3 m .


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