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13. (a) The forces are constant, so the work done by any one of them is given by
WF
d
=⋅
G
G
, where
G
d
is the displacement. Force
G
F
1
is in the direction of the displacement,
so
11
1
cos
(5.00 N)(3.00m)cos0
15.0 J.
d
φ
==
°
=
Force
G
F
2
makes an angle of 120° with the displacement, so
22
2
cos
(9.00 N)(3.00m)cos120
13.5 J.
d
°
=
−
Force
G
F
3
is perpendicular to the displacement, so
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 Spring '08
 Any
 Physics, Force, Work

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