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if
d
<
L
.
With
μ
k
= 0.70, we find
d
= 9.3 m, which is indeed less than
L
(given in the
problem as 12 m).
We conclude that the block stops before passing out of the “rough”
region (and thus does not arrive at point
D
).
72. (a) At
B
the speed is (from Eq. 817)
22
2
01
2
(7.0 m/s)
2(9.8 m/s )(6.0 m)
13 m/s.
vv
g
h
=+
=
+
=
(a) Here what matters is the difference in heights (between
A
and
C
):
2
2
2 (
)
(7.0 m/s)
2(9.8 m/s )(4.0 m)
11.29 m/s 11m/s.
g
h
h
−
=
+
=
≈
(c) Using the result from part (b), we see that its kinetic energy right at the beginning of
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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

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