11.75:
a)
N
424
.
0
N
424
.
0
30
cos
2
0
)
cos
2
(
at
axis
,
0
30
so
2
sin
N
47
.
1
2
=
=
=
°
=
=

=
τ
°
=
=
=
=
C
A
C
C
B
F
F
mg
F
wR
θ
R
F
P
θ
R
R
θ
w
F
b) Consider the forces on the bottom marble. The horizontal forces must sum to
zero, so
N
848
.
0
30
sin
sin
=
°
=
=
A
A
F
n
θ
n
F
Could use instead that the vertical forces sum to zero
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