74. (a) Computing the torques about the hinge, we have
sin 40
sin50
2
L
TL
W
°=
°
where
the length of the beam is
L
= 12 m and the tension is
T
= 400 N. Therefore, the weight is
671 N
W
=
, which means that the gravitational force on the beam is
ˆ
( 671 N)j
w
F
=−
G
.
(b) Equilibrium of horizontal and vertical forces yields, respectively,
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This note was uploaded on 05/17/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.
 Spring '08
 Any
 Physics, Force

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