33. The problem intends for the children to be completely above water. The total
downward pull of gravity on the system is
()
wood
3 356 N
Ng
V
ρ
+
where
N
is the (minimum) number of logs needed to keep them afloat and
V
is the
volume of each log:
V
=
π
(0.15 m)
2
(1.80 m) = 0.13 m
3
. The buoyant force is
F
b
=
water
gV
submerged
where we require
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This note was uploaded on 06/03/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.
 Spring '08
 Any
 Physics, Gravity

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