ch07-p013 - 13. (a) The forces are constant, so the work...

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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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