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17. The (vertical) forces at points
A, B
and
P
are
F
A
, F
B
and
F
P
, respectively. We note
that
F
P
=
W
and is upward. Equilibrium of forces and torques (about point
B
) lead to
0
0.
AB
A
FFW
bW
aF
++=
−=
(a) From the second equation, we find
F
A
=
bW
/
a
= (15/5)
W
= 3
W
=
3
3(900 N)=2.7 10 N
×
.
(b) The direction is upward since
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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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