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(b) Similarly, finding the value of
a
is straightforward:
a
=
g
(
m
A
sin
θ
–
μ
k
m
B
)/(
m
A
+
m
B
) =1.6 m/s
2
.
81. (a) If we choose “downhill” positive, then Newton’s law gives
m
A
g
sin
θ
–
f
A
–
T
=
m
A
a
for block
A
(where
= 30º).
For block
B
we choose leftward as the positive direction and
write
T
–
f
B
=
m
B
a.
Now
f
A
=
k
,incline
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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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