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19. (a) With the pivot at the hinge, Eq. 129 gives
TL
cos
θ
–
mg
L
2
= 0 . This leads to
78 .
=°
Then the geometric relation tan
=
L/D
gives
D
= 0.64 m.
(b) A higher (steeper) slope for the cable results in a smaller tension.
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 Spring '08
 Any
 Physics

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