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39. We use Eq. 2913 and the superposition of forces:
G
G
G
G
FFF
F
4 1
42
43
4
=++
. With
θ
= 45°,
the situation is as shown on the right.
The components of
G
F
4
are given by
22
2
00
0
44
3
4
2
cos 45
3
cos
24
x
ii
i
FF
F
aa
a
µ
µµ
°
=−
−
−
ππ
π
and
2
0
1
4
2
sin 45
sin
.
y
i
F
a
°
=
−
=
π
Thus,
()
12
2
2
0
444
4
10 4
T m A
7.50A
31
0
4
4
4
4
0.135m
1.32 10 N/m
xy
i
a
π
−
⎡⎤
×⋅
⎛⎞
⎛
⎞
⎢⎥
=+
=
−
+
=
=
⎜⎟
⎜
⎟
⎝⎠
⎝
⎠
⎣⎦
=×
−7
π1
0
π
and
G
F
4
makes an angle
φ
with the positive
x
axis, where
=
F
H
G
I
K
J
F
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 Spring '08
 Any
 Physics, Force

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